Development of novel materials and synthesis of single crystals and epitaxial thin films of d- and f-electron based oxides; Experimental studies of highly correlated electron systems with an emphasis on magnetic, transport and thermal properties.
Education
B.Sc Wuhan University, 1982
M. Sc Temple University, 1987
Ph. D. Temple University, 1992
Post-doc: National High Magnetic Field Laboratory (1992-1995)
Assistant Scientist: National High Magnetic Field Laboratory (1995-1998)
Associate Scientist: National High Magnetic Field Laboratory (1998-2001)
"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 strong spin valve effect in bulk Ca3 (Ru1-x Crx )2 O7",
G. Cao, V. Durairaj, S. Chikara, and L.E. DeLong,
Phys. Rev. Lett. 100, 016604 (2008).
"Discovery of a /J/ = 1/2 Mott insulator in Sr_2 IrO_4 " 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, Submitted to
Nature, 2007
"Partial antiferromagnetism in spin-chain Sr_5 Rh_4 O_12 , Ca_5 Ir_3
O_12 and Ca_4 IrO_6 single crystals" G. Cao, V. Durairaj, S. Chikara, S.
Parkin and P. Schlottmann, Phys. Rev. B *75*, 134402 (2007)
"Anomalous itinerant magnetism in single-crystal Sr_4 Ru_3 O_10 : A
thermodynamic and transport investigation" G. Cao, S. Chikara, J. W.
Brill, and P. Schlottmann, Phys. Rev. B *75*, 024429 (2007)
"Magnetic anisotropy and geometrical frustration of an Ising
one-dimensional system Sr_5 Rh_4 O_12 â€ţXť, G. Cao, S. Parkin, and P.
Schlottmann, Solid State Comm.*141*, 369 (2007)
"Heat Capacity of (Ca_1-x Sr_x )_3 Ru_2 O_7 Single Crystals", V.
Varadarajan, S, Chikara, V. Durairaj, X.N. Lin, G. Cao, and J.W. Brill,
Solid State Comm.*141*, 402 (2007)
"Borderline magnetism in Sr_4 Ru_3 O_10 : 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)
"Field- and pressure-induced phases in Sr_4 Ru_3 O_10 : A spectroscopic
investigation" Rajeev Gupta, M. Kim, H. Barath, S.L. Cooper and G. Cao,
Phys. Rev Lett. *96*, 067004 (2006)
"Highly anisotropic magnetism in Cr doped Perovskite Ruthenates", V.
Durairaj, S. Chikara, X.N. Lin, A. Douglass, G. Cao, P. Schlottmann,
E.S.Choi and R.P. Guertin, Phys. Rev B *73*, 214414 (2006)
"Observation of Quantum Oscillations Periodic in 1/B and B in Bilayered
Ca_3 Ru_2 O_7 ", V. Durairaj, X. N. Lin, Z.X. Zhou, S Chikara, E.
Elhami, P. Schlottmenn and G. Cao, Phys. Rev. B *73*, 054434 (2006)
"Spectroscopic Study of the Field- and Pressure-Induced Phases of the
Bilayered Ruthenates Ca_3 Ru_2 O_7 ", J. F. Karpus, C. S. Snow, R.
Gupta, H. Barath, S. L. Cooper, and G. Cao, Phys. Rev B *73*, 134407 (2006)
"Electronic structures of layered perovskite Sr_2 /M/O_4 (/M/=Ru, Rh,
and Ir)",S. J. Moon, M. W. Kim, K. W. Kim, Y. S. Lee, J.-Y. Kim, J.-H.
Park, B. J. Kim, S.-J. Oh, S. Nakatsuji, Y. Maeno, I. Nagai, S. I.
Ikeda, G. Cao, and T. W. Noh, Phys. Rev B *74*, 113104 (2006)
"Colossal Magnetoresistance by Avoiding a Ferromagnetic State in Mott
System Ca_3 Ru_2 O_7 ", X. N. Lin, Z.X. Zhou, V. Durairaj, P.
Schlottmenn and G. Cao, Phys. Rev. Lett. *95*, 017203 (2005)
"From Itinerant Ferromagnetism to Insulating Antiferromagnetism: a
Magnetic and Transport study of Single Crystal SrRu_1-x Mn_x O_3
(0≤x<0.60)", G. Cao, S. Chikara, E. Elhami, X.N. Lin and P. Schlottmann,
Phys. Rev. B *71*, 035104 (2005)
"Field-Induced Orbital and Magnetic Phases in Ca_3 Ru_2 O_7 : Light
Scattering Studies", J.F. Karpus, R. Gupta, Barath, S.L. Cooper and G.
Cao, Phys. Rev. Lett.* **93*, 167205 (2004)
"High-temperature Weak ferromagnetism on the verge of a metallic
state: Impact of dilute Sr-doping on BaIrO_3 ", G. Cao, S. Chikara, X.N.
Lin, E. Elhami and V. Durairaj, Phys. Rev. B *69*, 174418 (2004)
"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)
Major Research Facilities
NEC optical floating zone furnace with pressure and vacuum options.
Quantum Design SQUID Magnetometer MPMS-7T with an added transport probe capable of magnetic and transport measurements in a temperature of range of 1.7-400 K and in magnet fields up to 7 T.
Oxford 15 T magnet with 3He and 4He temperature inserts capable of transport and magnetic measurements in a temperature of range of 1.8-350 K and in magnet field up to 15 T.
Heat Capacity System to be added to a 9 T Quantum Design Physical Property Measurement System (PPMS)
Scintag powder x-ray diffractometer capable for theta, 2 theta and rocking curve measurements
Closed cycle cryostat (Advanced Research System) for transport measurements capable of continuous temperature sweeping between 9 K to 900 K.
Linear Research 700 AC resistance bridge, an array of Keithley meters such as Keithley 2400 Sourcemeter, Keithley 2182 Nanovoltmeter, Lake Shore 331 temperature controller, Condutus temperature controller, etc.
QuadTech 7600 LCR meter with a frequency range of 10 Hz
Various box, tube, and zone furnaces for high-temperature (up to 1700 C) materials synthesis including flux growth of single crystals and crystal annealing in different atmospheres.
