For all publications, please visit Google Scholar 

Most Recent Submissions/Publications

  •  Mechanical control of physical properties in the van der Waals ferromagnet Cr2Ge2Tevia application of electric currentHengdi Zhao, Yifei Ni, Bing Hu, Sabastian Selter, Saicharan Aswartham, Yu Zhang, Bernd Buchner, Pedro Schlottmann, and Gang Cao, 2022, arXiv:2201.08509
  • Emergence of spinons in layered trimer iridate Ba4Ir3O10, Y. Shen, J. Sears, G. Fabbris, A. Weichselbaum, W. Yin, H. Zhao, D. G. Mazzone, H. Miao, M .H. Upton, D. Casa, R. S. Acevedo-Esteves, C. Nelson, A. M. Barbour, C. Mazzoli, G. Cao, and M. P. M. Dean, 2022, arXiv:2201.02567
  • Flexible lattice in Ca3Ru2O7: Control of the electrical transport via anisotropic magnetostriction, Hengdi Zhao, Hao Zheng, Jasminka Terzic, Wenhai Song, Yifei Ni, Yu Zhang, Pedro Schlottmann and Gang Cao, Letter of Phys. Rev. B 104, L121119 (2021); DOI: 10.1103/PhysRevB.104.L121119 

This work uncovers a lattice-dependent magnetotransport mechanism in which the unusual lattice flexibility enables an exquisite control of the electronic state via magnetically stretching or shrinking the lattice in a uniaxial fashion, and the spin polarization plays an unconventional role unfavorable for maximizing conductivity. This is utterly different from known experimental precedents in which magnetostrictive effects are isotropic, and the spin polarization always remains an essential, favorable element that facilitates electron hopping. The unusually anisotropic magnetostriction is at the heart of the intriguing physics of Ca3Ru2O7, hinting an analogy to multiferroics.   



  • The ground state in a proximity to a possible Kitaev spin liquid: An undistorted honeycomb iridate NaxIrO3 (0.60 < x < 0.80), Hengdi Zhao, Bing Hu, Feng Ye, Minhyea Lee, Pedro Schlottmann and Gang Cao, Letter of Phys. Rev. B 104, L041108 (2021), Editors' Suggestion; DOI: 10.1103/PhysRevB.104.L041108

The Kitaev quantum spin liquid has been among the most intensively studied states of matter but there has been no clear-cut materials realization of it. Its absence is largely because all existing honeycomb lattices are inherently distorted and disordered, which inevitably amplifies the competing Heisenberg interaction in the Kitaev-Heisenberg model, leading to an unwanted antiferromagnetic state. This work reports a new, undistorted honeycomb iridate NaxIrO3 where all evidence indicates that the elusive Kitaev spin liquid may be finally within reach.  


  • Colossal magnetoresistance via avoiding fully polarized magnetization in ferrimagnetic insulator Mn3Si2Te6, Yifei Ni, Hengdi Zhao, Yu Zhang, Bing Hu, Itamar Kimchi and Gang Cao, Letter of Phys. Rev. B 103, L161105 (2021); Editors' Suggestion; DOI: 10.1103/PhysRevB.103.L161105

Magnetic polarization reduces spin scattering and underpins colossal magnetoresistance (CMR) in the manganites and almost all other CMR materials. In sharp contrast, the observed CMR in the ferrimagnetic insulator Mn3Si2Te6, which features a resistivity drop by astonishing 7 orders of magnitude, emerges only when the fully polarized magnetization is avoided. This intriguing type of electrical transport fits no existing theoretical models, providing a new paradigm for studying CMR and its applications.  


  • Correlation between antiferromagnetic and Mott states in spin-orbit-coupled Sr2IrO4: A study of Sr2Ir1-xMxO4 (M=Fe or Co), Bing Hu, Hengdi Zhao, Yu Zhang, Pedro Schlottmann, Feng Ye and Gang Cao, Phys. Rev. B 103, 115122 (2021)



Physics of Spin-Orbit-Coupled Oxides,  Gang Cao and Lance E. DeLong, Oxford University Press, ISBN 978-0-19-960202-5; 2021

                                                             Book cover for Physics of Spin-Orbit-Coupled Oxides                             

Frontiers of 4d- and 5d-Transition Metal Oxides, Gang Cao and Lance E. DeLong, World Scientific, ISBN 978-981-4374-859; 2013

Book cover for Frontiers of 4d and 4d transition metal oxides

Selected Publications (out of 260)

  • “Quest for Quantum States via Field-Editing Technology”, Gang Cao, Hengdi Zhao, Bing Hu, Nicholas Pellatz, Dmitry Reznik, Pedro Schlottmann and Itamar Kimchinpj Quantum Mater. 5, 83 (2020);
  • “Quantum liquid from strange frustration in the trimer magnet Ba4Ir3O10”, G. Cao, H. D. Zhao, H. Zheng, Y. F. Ni, Christopher. A. Pocs, Y. Zhang, Feng, Ye, Christina Hoffmann, Xiaoping Wang, Minhyea Lee, Michael Hermele and Itamar Kimchi, npj Quantum Mater. 5, 26 (2020);  
  • "Topical Review : Towards Electrical-Current Control of Quantum States in Spin-Orbit-Coupled Matter", Gang Cao, Journal of Physics: Condensed Matter, 2020 
  • “Possible Quantum Paramagnetism in Compressed Sr2IrO4”, D. Haskel, G. Fabbris, J. H. Kim, L. S. I. Veiga, J. R. L. Mardegan, C. A. Escanhoela, Jr., S. Chikara, V. Struzhkin, T. Senthil, B. J. Kim, G. Cao, and J.W. Kim, Phys. Rev. Lett. 124, 067201 (2020)
  • Pseudospin-lattice coupling and electric control of the square-lattice iridate Sr2IrO4”, Feng Ye, Christina Hoffmann, Wei Tian, Hao Zheng, Hengdi Zhao, and G. Cao, Phys. Rev. B 102, 115120 (2020)
  • Competition of three-dimensional magnetic phases in Ca2Ru1−xFexO4: A structural, perspective”, Songxue Chi, Feng Ye, Gang Cao, Huibo Cao, and Jaime A. Fernandez-Baca, Physics Review B 102, 014452 (2020); DOI: 10.1103/PhysRevB.102.014452 
  • “Persistent Insulating State at Megabar Pressures in Strongly Spin-Orbit-Coupled Sr2IrO4”, Chunhua Chen, Yonghui Zhou, Xuliang Chen, Tao Han, Chao An, Ying Zhou, Yifang Yuan, Bowen Zhang, Shuyang Wang, Ranran Zhang, Lili Zhang, Changjing Zhang, Zhaorong Yang, Lance E. DeLong and Gang Cao, Phys. Rev. B 101, 144102 (2020); DOI:10.1103/PhysRevB.101.144102
  • “Direct detection of dimer orbitals in Ba5AlIr2O11”, Y. Wang, Ruitang Wang, Jungho Kim, M. H. Upton, D. Casa, T. Gog, G. Cao, J. P. Hill, G. Kotliar,M. P. M. Dean,and X. Liu, Phys. Rev. Lett.,122, 106401 (2019)
  • “Nonequilibrium Orbital Transitions via Applied Electrical Current in Calcium Ruthenate”, Hengdi Zhao, Bing Hu, Feng Ye, Christina Hoffmann, Itamar Kimchi and Gang Cao; Phys. Rev. B 100, 241104(R) Rapid Comm (2019)
  • “A Novel ground state in a new dimer iridate Ba13Ir6O30 with Ir6+(5d3) Ions”, Hengdi Zhao, Feng Ye, Hao Zheng, Bing Hu, Yifei Ni, Yu Zhang, Itamar Kimchi and Gang Cao, Phys. Rev. B 100, 064418 (2019)
  • "Electrical Control of Structural and Physical Properties via Spin-Orbit Interactions in Sr2IrO4”, G. Cao, J. Terzic, H. D. Zhao, H. Zheng, L. E. DeLong and Peter Riseborough, Phys. Rev. Lett. 120, 017201 (2018); Editor's Suggestion. DOI:
  • “The Challenge of Spin-Orbit-Tuned Ground-States in the Iridates: A Key Issues Review”, Gang Cao and Pedro Schlottmann, Reports on Progress in Physics 81 042502 (2018) DOI: 
  •  “Observation of a pressure-induced transition from nterlayer ferromagnetism to intralayer antiferromagnetism in Sr4Ru3O10”, H . Zheng, W.H. Song, J. Terzic, H. D. Zhao, Y. Zhang, Y. F. Ni, L. E. DeLong, P. Schlottmann and G. Cao, Phys. Rev. B 98, 064418 (2018);DOI: 10.1103/PhysRevB.98.064418; Editor’s Suggestion
  • “Evidence for a magnetic state in double-perovskite iridates with Ir5+(5d4) ions”, J. Terzic, H. Zhang, Feng Ye, P. Schlottmann, H. D. Zhao, L. DeLong, S. J. Yuan and G. Cao, Phys. Rev. B 96, 064436 (2017)
  • “Electron Doping Evolution of Magnetic Excitations and Spin-Orbit Excitons in (Sr1−xLax)3Ir2O7”, Xingye Lu, D. E. McNally, M. Moretti Sala, J. Terzic, M. H. Upton, D. Casa, G. Cao, and T. Schmitt, Phys. Rev. Lett. 118, 027202 (2017)
  •  “Simultaneous Metal-Insulator and Antiferromagnetic Transitions in Orthorhombic Perovskite Iridate Sr0.94Ir0.78O2.68 Single Crystals”, H. Zheng, J. Terzic, Feng Ye, X.G. Wan, D. Wang, Jinchen Wang, Xiaoping Wang, P. Schlottmann, S. J. Yuan and G. Cao, Phys. Rev. B 93, 235157 (2016)
  • “Hallmarks of the Mott-Metal Crossover in the Hole Doped J=1/2 Mott insulator Sr2IrO4”, Yue Cao, Qiang Wang, Justin A. Waugh, Theodore Reber, Haoxiang Li, Xiaoqing Zhou, Stephen Parham, Nicholas Plumb, Eli Rotenberg, Aaron Bostwick, Jonathan Denlinger, Tongfei Qi, K. Orenta, Michael Hermele, G. Cao and Daniel S. Dessau, Nature Comm., 2016 doi:10.1038/ncomms11367
  • “Pressure-Induced Confined Metal from the Mott Insulator Sr3Ir2O7”, Yang Ding, Cheng-Chien Chen, Heung-Sik Kim, Myung Joon Han, Zhenxing Feng, Mary Upton, Jungho Kim, Diego Casa, Ayman Said, Yufeng Peng, G. Cao, Thomas Gog, Ho-kwang Mao, and Michel van Veenendaal, Phys. Rev. Lett. 116, 216402 (2016)
  •  “Evidence of an odd-parity hidden order in a strongly spin-orbit coupled correlated iridates”, L. Zhao, D. H. Torchinsky, H. Chu, V. Ivanov, R. Lifshitz, R. Flint, T. Qi, G. Cao and D. Hsieh, Nature Physics, 2015 doi:10.1038/nphys3517
  • “Crystal and Magnetic Structures in Square Lattice Iridate Sr2Ir1-xRhxO4”, Feng Ye, Xiaoping Wang, Christina Hoffmann, Songxue Chi, Masaaki Matsuda, Bryan C. Chakoumakos, Jaime A. Fernandez-Baca, Jinchen Wang and G. Cao, Phys. Rev. B, 92 201112(R) (2015)
  • “Decoupling of the Antiferromagnetic and Insulating States in Tb doped Sr2IrO4”, J. C. Wang, S. Aswartham, F. Ye, J. Terzic, H. Zheng, Daniel Haskel, Shalinee Chikara, Yong Choi, P. Schlottmann, S. J. Yuan and G. Cao, Phys. Rev. B 92, 214411 (2015)
  • “A structural distortion induced magneto-elastic locking in Sr2IrO4 revealed through nonlinear optical harmonic generation”, D. H. Torchinsky, H. Chu, L. Zhao, N. B. Perkins, Y. Sizyuk, T. Qi, G. Cao, and D. Hsieh, Phys. Rev. Lett. 114, 096404 (2015)
  • “Coexisting charge and magnetic orders in the dimer-chain iridate Ba5AlIr2O11”, J. Terzic, J. C. Wang, Feng Ye, W. H. Song, S. J. Yuan, S. Aswartham, L. E. DeLong, S.V. Streltsov, D.I. Khomskii and G. Cao, Phys. Rev. B 91, 235147 (2015)
  • “Confinement-Deconfinement Transition as an Indication of Spin-Liquid-Type Behavior in Na2IrO3”, Zhanybek Alpichshev, Fahad Mahmood, G. Cao, and Nuh Gedik, Phys. Rev. Lett. 114, 017203 (2015)
  • “Novel magnetism of Ir5+ (5d4) ions in the double perovskite Sr2YIrO6”, G. Cao, T. F. Qi, L. Li, J. Terzic, S. J. Yuan, L. E. DeLong, G. Murthy and R. K. Kaul, Phys. Rev. Lett. 112, 056402 (2014)
  • “Lattice-Tuned Magnetism of Ru4+(4d4) Ions in Single-Crystals of the Layered Honeycomb Ruthenates: Li2RuO3 and Na2RuO3”, J. C. Wang, J. Terzic, T. F. Qi, Feng Ye, S. J. Yuan, S. Aswartham, S. V. Streltsov, D. I. Khomskii, R. K. Kaul and G. Cao, Phys. Rev. B 90 161110 (R) (2014)
  • “Tuning Magnetic Coupling in Sr2IrO4 Thin Films with Epitaxial Strain”, A. Lupascu, J. P. Clancy, H. Gretarsson, Zixin Nie, J. Nichols, J. Terzic, G. Cao, S. S. A. Seo, Z. Islam,  M. H. Upton,  Jungho Kim,  D. Casa,  T. Gog,  A. H. Said, Vamshi M. Katukuri,  H. Stoll,  L. Hozoi,  J. van den Brink, and Young-June Kim, Phys. Rev. Lett. 112, 147201 (2014)
  • “Evolution of Magnetism in Single-Crystal Honeycomb Iridates”, G. Cao, T. F. Qi,  L. Li,  J. Terzic,  V. S. Cao, S. J. Yuan, M. Tovar,  G. Murthy,  and R. K. Kaul, Phys. Rev B 88 220414 (R) (2013)
  •  “Ferromagnetic Anisotropy from Antiferromagnetic Superexchange in the Mixed 3d − 5d Transition-Metal Compound Sr3CuIrO6”, Wei-Guo Yin,  X. Liu,  A. M. Tsvelik,  M. P. M. Dean,  M. H. Upton, Jungho Kim, D. Casa, A. Said,  T. Gog,  T. F. Qi,  G. Cao, and J. P. Hill, Phys. Rev. Lett. 111, 057202 (2013)
  •  “Tuning Jeff = 1/2 Insulating State via Electron Doping and Pressure in Double-Layered Iridate Sr3Ir2O7”, L. Li, P. P. Kong, T. F. Qi, C. Q. Jin, S. J. Yuan, L. E. DeLong, P. Schlottmann and G. Cao, Phys. Rev. B 87, 235127 (2013)
  •  “Giant vertical magnetization shift induced by spin canting in a Co/Ca2(Ru 0.98Fe0.02)O4 heterostructure”, S. J. Yuan, L. Li, T. F. Qi, L. D. DeLong and G. Cao, Phys. Rev. B 88, 024413 (2013). Editors Suggestion
  • “The magnetic and crystal structures of Sr2IrO4: A neutron diffraction study”, Feng Ye, Songxue Chi, Bryan C. Chakoumakos, Jaime A. Fernandez-Baca, Tongfei Qi, and G. Cao, Phys. Rev. B 87, 140406(R) (2013)
  • “Superconductivity and anomalous electrical resistivity in Single-Crystal Ir3Te8”, L. Li, T. F. Qi, L. S. Lin, X. X. Wu, X.T. Zhang, K. S. J. Yuan, Butrouna, V. S. Cao, Y. H. Zhang, Jiangping Hu, P.  Schlottmann, L. E. DeLong and G. Cao, Phys. Rev. B 87, 174510 (2013)
  •  “Spin-orbit tuned metal-insulator transitions in single-crystal Sr2Ir1-xRhxO4, T. T Qi, O. Korneta, K. Butrouna, L. Li, V. S. Cao, Xiangan Wan, Ribhu Kaul, and G. Cao, Phys. Rev. B 86, 125105 (2012)
  • “Pressure-tuning of spin-orbit coupled ground state in Sr2IrO4, D. Haskel, G. Fabbris, Mikhail Zhernenkov, M. van Veenendaal, P. Kong, C. Jin, G. Cao, Phys. Rev. Lett. 109, 027204 (2012)
  •  “Orbit-Coupling Limit for Octahedrally Coordinated Iridate Compounds in a Model System Sr3CuIrO6”, X. Liu, Vamshi Katukuri, Liviu Hozoi, Wei-Guo Yin, M. P. M. Dean, Mary Upton, Jungho Kim, Diego Casa, Tongfei Qi, G. Cao, A. M. Tsvelik, Jeroen van den Brink, and J. P. Hill, Phys. Rev Lett. 109, 157401 (2012)
  • “Direct evidence of a zigzag spin-chain structure in honeycomb lattice: A neutron and x-ray diffraction investigation on single-crystal Na2IrO3, Feng Ye, Songxue Chi, Huibo Cao, Bryan Chakoumakos, Jaime A. Fernandez-Baca, Radu Custelcean, Tongfei Qi, O. B. Korneta, and G. Cao, Phys. Rev. B 85, 180403(R) (2012)
  • “Strong magnetic instability in correlated metal Bi2Ir2O7”, T. F. Qi, O. B. Korneta, and Xiangang Wan, and G. Cao, J of Phys: Condens Matter 24, 345601 (2012)  This paper is featured in Lab Talk of JPCM on Issue August 2, 2012
  • “Magnetic and Orbital Orders Coupled to Negative Thermal Expansion in Mott Insulators Ca2Ru1-xMxO4 (M=Mn and Fe)”, T. F. Qi, O. B. Korneta, S. Parkin, Jianping Hu and G. Cao, Phys. Rev. B, 85 165143 (2012)
  • “Lattice-Driven Magnetoresistivity and Metal-Insulator Transition in Single-Layered Iridates”, M. Ge, T. F. Qi, O.B. Korneta, L.E. De Long, P. Schlottmann and G. Cao, Phys Rev B 84, 100402(R) (2011)
  • “Measurements of the Internal Magnetic Field in the Correlated Iridates Ca4IrO6, Ca5Ir3O12, Sr3Ir2O7 and Sr2IrO4”, I. Franke, P.J. Baker, S.J. Blundell, T. Lancaster, W. Hayes, F.L. Pratt, and G. Cao, Phys. Rev. B 83 094416 (2011)
  • “Negative Volume Thermal Expansion via Orbital and Magnetic Orders in Single-Crystal Ca2Ru1-xCrxO4”, T.F. Qi, O.B. Korneta, S. Parkin, L.E. DeLong, P. Schlottmann and G. Cao, Phys. Rev. Lett. 105, 177203 (2010)
  • “Orbital Magnetism and Spin-Orbit Effects in the Electronic Structure of BaIrO3”, M. A. Laguna-Marco, D. Haskel, N. Souza-Neto, J. C. Lang, V. V. Krishnamurthy, S. Chikara, G. Cao, and Michel van Veenendaal, Phys. Rev. Lett. 105, 216407 (2010)
  • “Electron-Doped Sr2IrO4-d (0 < d< 0.04):  Evolution of a Disordered Jeff = 1/2 Mott Insulator into an Exotic Metallic State”, O.B. Korneta, Tongfei Qi, S. Chikara, S. Parkin, L. E. DeLong, Pedro Schlottmann and G. Cao, Phys. Rev. B 82, 115117 (2010)
  • “Pressure-induced Insulating State in Single-crystal Ba1-xGdxIrO3”, O. B.  Korneta, S. Chikara, L.E. DeLong. P. Schlottmann and G. Cao, Phys. Rev. B 81, 045101 (2010)
  •  “Giant Magneto-Electric Effect in the Jeff =1/2 Mott Insulator, Sr2IrO4”, S. Chikara, O. Korneta, W. P. Crummett, L.E. DeLong, P. Schlottmann and G. Cao, Phys. Rev. B 80, 140407 (R) (2009)
  • “Observation of Strong Spin Valve Effect in Bulk Ca3(Ru1-xCrx)2O7”, G. Cao, V. Durairaj S. Chikara L. E. DeLong and P. Schlottmann, Phys. Rev. Lett. 100, 106604 (2008)
  • “Novel Jeff 1=2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4”, B. J. Kim, Hosub Jin, S. J. Moon, J.-Y. Kim, B.-G. Park, C. S. Leem, Jaejun Yu, T. W. Noh, C. Kim, S.-J. Oh, V. Durairai, G. Cao & J.-H. Park, Phys. Rev. Lett. 101, 076402 (2008)
  • “Dimensionality-Controlled Insulator-Metal Transition and Correlated Metallic State in 5d Srn+1IrnO3n+1 (n=1, 2, and 1)”, S.J. Moon, H. Jin, K.W. Kim, W.S. Choi, Y.S. Lee, J. Yu, G. Cao, A. Sumi, H. Funakubo, C. Bernhard, and T.W. Noh, Phys. Rev. Lett. 101, 226401 (2008)
  • “Anomalous itinerant magnetism in single-crystal Sr4Ru3O10: A Thermodynamic and Transport Investigation” G. Cao, S. Chikara, J. W. Brill, and P. Schlottmann, Phys. Rev. B 75, 024429 (2007)
  • “Partial Antiferromagnetism in Spin-Chain Sr5Rh4O12, Ca5Ir3O12 and Ca4IrO6 Single Crystals” G. Cao, V. Durairaj, S. Chikara, S. Parkin and P. Schlottmann, Phys. Rev. B 75, 134402 (2007).
  • “Non-Fermi-Liquid Behavior in Nearly Ferromagnetic Metal SrIrO3 Single Crystals”, G. Cao, V. Duarairaj, S. Chikara, L.E. DeLong, S. Parkin, and P. Schlottmann, Phys. Rev. B 76, 100402(R) (2007)
  •  “Observation of Quantum Oscillations Periodic in 1/B and B in Bilayered Ca3Ru2O7”, V. Durairaj, X. N. Lin, Z.X. Zhou, S Chikara, E. Elhami, P. Schlottmann and G. Cao, Phys. Rev. B 73, 054434 (2006)
  •  “Field- and Pressure-induced Phases in Sr4Ru3O10: A Spectroscopic Investigation” Rajeev Gupta, M. Kim, H. Barath, S.L. Cooper and G. Cao, Phys. Rev Lett. 96, 067004 (2006)
  •  “Borderline Magnetism in Sr4Ru3O10: Impact of Dilute La and Ca Doping on Itinerant ferromagnetism and metamagnetism”, S. Chikara, V. Durairaj,  W.H. Song, Y.P. Sun, X.N. Lin, A. Douglass, G. Cao, P. Schlottmann, and S. Parkin, Phys. Rev. B 73, 224420 (2006).
  • “Angle-resolved de Hass-van Alphen study of SrRuO3”, C.S. Alexander, S. McCall, P. Schlottmann, J. E. Crow and G. Cao, Phys. Rev. B 72, 24415 (2005)
  •   “From Itinerant Ferromagnetism to Insulating Antiferromagnetism: a Magnetic and Transport study of Single Crystal SrRu1-xMnxO3 (0≤x<0.60)”, G. Cao, S. Chikara, E. Elhami, X.N. Lin and P. Schlottmann, Phys. Rev. B 71, 035104 (2005)
  •  “Colossal Magnetoresistance by Avoiding a Ferromagnetic State in Mott System Ca3Ru2O7”, X. N. Lin, Z.X. Zhou, V. Durairaj, P. Schlottmenn and G. Cao, Phys. Rev. Lett. 95, 017203 (2005)
  • “Field-Induced Orbital and Magnetic Phases in Ca3Ru2O7: Light Scattering Studies”, J.F.  Karpus, R. Gupta, Barath, S.L. Cooper and G. Cao, Phys. Rev. Lett. 93, 167205 (2004)
  • (Invited Paper) “Orbitally-driven Behavior: Mott Transition, Quantum Oscillations and Colossal Magnetoresistance in Bilayered Ca3Ru2O7”, G. Cao, X.N. Lin, L. Balicas, S. Chikara, J.E. Crow and P. Schlottmann, a special issue on Orbital Physics, New Journal of Physics 6, 159 (2004). or  Selected as IOP Select (IOP=Institute of Physics in Europe)
  • “Field-Tuned Collapse of an Orbital Ordered and Spin-polarized State: Colossal Magnetoresistance in Bilayered Ruthenate”, G. Cao, L. Balicas, X.N. Lin, S. Chikara, V. Durairaj, E. Elhami, J.W. Brill, R.C. Rai and J. E. Crow, Phys. Rev. B 69, 014404 (2004)
  •  “High-temperature Weak ferromagnetism on the verge of a metallic state: Impact of dilute Sr-doping on BaIrO3”, G. Cao, S. Chikara, X.N. Lin, E. Elhami and V. Durairaj, Phys. Rev. B 69, 174418 (2004).
  • “Transport and thermodynamic properties of Sr3Ru2O7 near the quantum critical point”, Z.X Zhou, S. McCall, C.S. Alexander, J.E. Crow, P. Schlottmann, A. Bianchi, C. Capan, R. Movshovich, K.H. Kim, M. Jaime, and N. Harrison, M. Haas, R. Cava and G. Cao, Phys. Rev. B 69, 140409  (2004)
  • “Tunneling Magnetoresistance and Quantum Oscillations in Bilayered Ca3Ru2O7”, G. Cao, L. Balicas, Y. Xin, E. Dagotto, J.E. Crow, C.S. Nelson, and D.F. Agterberg, Phys. Rev. B 67 060406(R) (2003)
  • “Impact of Magnetic Fields on Anisotropy in Ca3Ru2O7”, S. McCall, G. Cao, and J.E. Crow, Phys. Rev. B 67, 094427 (2003).
  • “Coloassal Magnetoresistance, Quantum Oscillations and Magnetoelastic Interactions in Bilayered Ca3Ru2O7”, G. Cao, L. Balicas, Y. Xin, J.E. Crow, and C.S. Nelson, Phys. Rev. B 67, 184405 (2003)
  • “Competing Ground State in Triple-layered Sr4Ru3O10: Verging on Itinerant Ferromagnestism with Critical Fluctuations”, G. Cao, L. Balicas, W. H. Song, Y. P. Sun, Y. Xin, V.A. Bondarenko, J.W. Brill, S. Parkin, and X. N. Lin, Phys. Rev. B 68 174409 (2003)
  • “Anomalous Magnetic and Transport properties in Magnetic Insulator Sr3Ir2O7”, G. Cao, Y. Xin, C. S. Alexander, J.E. Crow and P. Schlottmann, Phys. Rev. B 66, 214412 (2002)
  • “Structure and Magnetism of Single Crystal Sr4Ru3O10: A Ferromagnetic Triple-Layered Ruthenates” M.K. Crawford, R.L. Harlow, W. Marshall, Z. Li, G. Cao, R.L. Lindstrom, Q. Huang, and J.W. Lynn. Phys. Rev. B 65, 214412 (2002)
  • “Sensitivity to Disorder of the Metallic State in the Ruthenates”, L. Capogna, A. P. Mackenzie, R. S. Perry, S. A. Grigera, L. M. Galvin, P. Raychaudhuri, A. J. Schofield, C. S. Alexander, G. Cao, S. R. Julian, and Y. Maeno, Phys. Rev Lett. 88, 76602 (2002) 
  • “Pressure-Tuned Collapse of the Mott-like State in Can+1RunO3n+1 (n=1,2): Raman Spectroscopic Stduies”, C.S. Snow, S.L. Cooper, G. Cao, J.E. Crow, S. Natatsuji, and Y. Maeno, Phys. Rev. Lett. 89, 226401 (2002)
  • “Magnetic Ordering and Enhanced Specific Heat in Insulating Ln2RuO5 (Ln=Nd, Pr, Sm, Gd and Tb)”, G. Cao, S. McCall, Z.X. Zhou, C.S. Alexander, and J.E. Crow, Phys. Rev B 63, 144427 (2001)
  • “Weak Ferromagnetism and Spin-Charge Coupling in Single Crystal Sr2YRuO6”, G. Cao, C.S. Alexander, Y Xin and J.E. Crow, Phys. Rev. B 63,184432 (2001)
  • “Ground-State Instability of Mott Insulator Ca2RuO4: Impact of Slight La-doping on Metal-Insulator Transition and Magnetic Ordering”, G. Cao, S. McCall, V. Dobrosavljevic, S.C. Alexander, and J.E. Crow, and R.P. Guertin, Phys. Rev. B 61, R5053 (2000)
  • “Charge Density Wave Formation Accompanying Ferromagnetic Ordering in Quasi-one-dimensional BaIrO3”, G. Cao, J.E. Crow, R.P. Guertin, P. Henning, C.C. Homes, M. Strongin, D.N. Basov, and E. Lochner, Solid State Comm. 113, 657 (2000)
  • “Spin-Charge Coupling for Dilute La-doped Ca3Ru2O7”, G. Cao, K. Abbound, S. McCall, J.E. Crow and R.P.Guertin, Phys. Rev. B 62, 998 (2000)
  • “Destruction of the Mott Insulating Ground State of Ca2RuO4 by a Structural Transition,” C.S. Alexander, G. Cao, V. Dobrosavljevic, E. Lochner, S. McCall, J.E. Crow and P.R. Guertin, Phys. Rev. B 60, R8422 (1999)
  • “Weak Ferromagnetism, Metal-to-Nonmetal Transition and Negative Differential Resistivity in Single Crystal Sr2IrO4”, G. Cao, J. Bolivar, S. McCall, J.E. Crow, and R.P. Guertin, Phys. Rev. B 57, R11039 (1998)
  • “Layered Ruthenium Oxides: From Band Metal to Mott Insulator”, A.V. Puchkov, M.C. Schabel, D.N Basov, T. Startseva, G. Cao, T. Timusk, and Z.-X. Shen, Phys. Rev. Lett. 81, 2747 (1998)
  • “Observation of a Metallic Antiferroamgnetic Phase and Metal-Nonmetal Transition in Ca3Ru2O7”, G. Cao, S. McCall, J.E. Crow and R.P. Guertin, Phys. Rev. Lett. 78, 1751 (1997)
  • “Thermal, Magnetic and Transport Properties of Single Crystal Sr1-xCaxRuO3 (0 < x < 1.0)”, G. Cao, S. McCall, M. Shepard, J. E. Crow, and R. P. Guertin, Phys. Rev. B 56, 321 (1997)
  • “Magnetic and Transport Properties of Single Crystal Ca2RuO4: Relationship to Superconducting Sr2RuO4”, G. Cao, S. McCall, M. Shepard, J.E. Crow and R.P. Guertin, Phys. Rev. B 56, R2916 (1997)
  • “Multiple Magnetic Phase Transitions in Single Crystal (Sr1-xCax)3Ru2O7 (0 < x < 1.0)”, G. Cao, S. McCall, J. E. Crow, and R. P. Guertin, Phys. Rev. B 56, 5387 (1997)
  • “Ferromagnetism in Sr4Ru3O10: Relationship to Other Layered Metallic Oxides”, G. Cao, S.K. McCall, J.E. Crow and R.P. Guertin, Phys. Rev. B 56, R5740 (1997)
  • “Observation of an Anomalous Quasi-One-Dimensional Behavior in Na2Ru4O9 Single Crystals”, G. Cao, S. McCall, M. Shepard, and J. E. Crow, Phys. Rev. B 53, 12215 (1996)
  • “Itinerant-to-Localized Electron Transition in Peroviskites CaRu1-xSnxO3 and SrRu1-xPbxO3”, G. Cao, S. McCall, J. Bolivar, M. Shepard, F. Freibert J.E. Crow, Phys. Rev. B 54, 15144 (1996)
  • "Evidence of Unusual Hybridization: Electrical Resistivity and Specific Heat of Y1-xTbxBa2Cu3O7 Single Crystals", G. Cao, S. McCall, F. Freibert, M. Shepard, P. Henning, J.E. Crow, and Bohdan Andraka, Phys. Rev. B 52, 71 (1995)
  • “Enhanced Electric Polarizability at Magnetic Ordering Temperature of La2CuO4+x”, G. Cao, J.W. O'Reilly, J.E. Crow, and L.R. Testardi, Phys. Rev. B 47, 11510 (1993)
  • "High Dielectric Permittivity of Ceramic and Single Crystal PrBa2Cu3Ox", P. Mazzara, S. Skirus, G. Cao, J.W. O'Reilly, J.E.  Crow, and L.R. Testardi, Phys. Rev. B 47, 8119 (1993)