Document Detail

Novel High-Pressure Monoclinic Metallic Phase of V2O3.
MedLine Citation:
PMID:  24580615     Owner:  NLM     Status:  In-Data-Review    
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.
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; Michel van Veenendaal
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Publication Detail:
Type:  Journal Article     Date:  2014-02-04
Journal Detail:
Title:  Physical review letters     Volume:  112     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2014 Feb 
Date Detail:
Created Date:  2014-03-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  056401     Citation Subset:  IM    
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