Novel High-Pressure Monoclinic Metallic Phase of ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$

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Novel High-Pressure Monoclinic Metallic Phase of $V_{2} O_{3}$

Yang Ding, Cheng-Chien Chen, Qiaoshi Zeng, Heung-Sik Kim, Myung Joon Han, Mahalingam Balasubramanian, Robert Gordon, Fangfei Li, Ligang Bai, Dimitry Popov, Steve M. Heald, Thomas Gog, Ho-kwang Mao, and Michel van Veenendaal

Phys. Rev. Lett. 112, 056401 – Published 4 February 2014

Abstract

Vanadium sesquioxide, $V_{2} O_{3}$ , 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, $V_{2} O_{3}$ 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.

Received 17 July 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.056401

Authors & Affiliations

Yang Ding^1,*, Cheng-Chien Chen¹, Qiaoshi Zeng², Heung-Sik Kim³, Myung Joon Han³, Mahalingam Balasubramanian¹, Robert Gordon⁴, Fangfei Li^5,6, Ligang Bai⁷, Dimitry Popov⁸, Steve M. Heald¹, Thomas Gog¹, Ho-kwang Mao^5,8,9,10, and Michel van Veenendaal^1,11

¹Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
²Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA
³Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
⁴PNCSRF, APS Sector 20, Argonne, Illinois 60439, USA
⁵HPSynC, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA
⁶State Key Lab of Superhard Materials, Jilin University, Changchun 130012, China
⁷HiPSEC and Department of Physics, University of Nevada Las Vegas, Las Vegas, Nevada, 89154, USA
⁸HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA
⁹Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015, USA
¹⁰Center for High Pressure Science and Technology Advanced Research, 1690 Cailun Road, Pudong, Shanghai 201203, China
¹¹Department of Physics, Northern Illinois University, De Kalb, Illinois 60115, USA

^*Author to whom all correspondence should be addressed. yangding@aps.anl.gov

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Vol. 112, Iss. 5 — 7 February 2014

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Physical Review Letters

Novel High-Pressure Monoclinic Metallic Phase of V2O3

Yang Ding, Cheng-Chien Chen, Qiaoshi Zeng, Heung-Sik Kim, Myung Joon Han, Mahalingam Balasubramanian, Robert Gordon, Fangfei Li, Ligang Bai, Dimitry Popov, Steve M. Heald, Thomas Gog, Ho-kwang Mao, and Michel van Veenendaal

Phys. Rev. Lett. 112, 056401 – Published 4 February 2014

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Novel High-Pressure Monoclinic Metallic Phase of $V_{2} O_{3}$