Novel High-Pressure Monoclinic Metallic Phase of V2O3

被引:53
作者
Ding, Yang [1 ]
Chen, Cheng-Chien [1 ]
Zeng, Qiaoshi [2 ]
Kim, Heung-Sik [3 ]
Han, Myung Joon [3 ]
Balasubramanian, Mahalingam [1 ]
Gordon, Robert [4 ]
Li, Fangfei [5 ,6 ]
Bai, Ligang [7 ,8 ]
Popov, Dimitry [9 ]
Heald, Steve M. [1 ]
Gog, Thomas [1 ]
Mao, Ho-kwang [5 ,9 ,10 ,11 ]
van Veenendaal, Michel [1 ,12 ]
机构
[1] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
[2] Stanford Univ, Stanford, CA 94305 USA
[3] Korea Adv Inst Sci & Technol, Dept Phys, Taejon 305701, South Korea
[4] PNCSRF, APS Sect 20, Argonne, IL 60439 USA
[5] Carnegie Inst Sci, Geophys Lab, HPSynC, Argonne, IL 60439 USA
[6] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China
[7] Univ Nevada, HiPSEC, Las Vegas, NV 89154 USA
[8] Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA
[9] Carnegie Inst Sci, Geophys Lab, HPCAT, Argonne, IL 60439 USA
[10] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
[11] Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China
[12] Univ Illinois, Dept Phys, De Kalb, IL 60115 USA
基金
美国国家科学基金会; 加拿大自然科学与工程研究理事会;
关键词
MOTT TRANSITION; INSULATOR-TRANSITION; ORBITAL OCCUPATION; CRITICAL-BEHAVIOR; SPIN; BAND; HYBRIDIZATION; TEMPERATURE; MODEL;
D O I
10.1103/PhysRevLett.112.056401
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Vanadium sesquioxide, V2O3, is a prototypical metal-to-insulator system where, in temperature-dependent studies, the transition always coincides with a corundum-to-monoclinic structural transition. As a function of pressure, V2O3 follows the expected behavior of increased metallicity due to a larger bandwidth for pressures up to 12.5 GPa. Surprisingly, for higher pressures when the structure becomes unstable, the resistance starts to increase. Around 32.5 GPa at 300 K, we observe a novel pressure-induced corundum-to-monoclinic transition between two metallic phases, showing that the structural phase transition can be decoupled from the metal-insulator transition. Using x-ray Raman scattering, we find that screening effects, which are strong in the corundum phase, become weakened at high pressures. Theoretical calculations indicate that this can be related to a decrease in coherent quasiparticle strength, suggesting that the high-pressure phase is likely a critical correlated metal, on the verge of Mott-insulating behavior.
引用
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页数:6
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