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Magnetic and transport studies of pure V_2O_3 under pressure

Carter, S. A. and Rosenbaum, T. F. and Lu, M. and Jaeger, H. M. and Metcalf, P. and Honig, J. M. and Spalek, J. (1994) Magnetic and transport studies of pure V_2O_3 under pressure. Physical Review B, 49 (12). pp. 7898-7903. ISSN 1098-0121. doi:10.1103/PhysRevB.49.7898.

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We report a systematic study of the resistivity and magnetic susceptibility of pure V_2O_3, the original Mott-Hubbard system at half filling, for pressures 0≤P≤25 kbar and temperatures 0.35≤T≤300 K. We also study (V_(0.99)Ti_(0.01)_2O_3 under pressure in order to elucidate the role of disorder on a metal-insulator transition in the highly correlated limit. Despite the low level of doping, we find that the two systems are very different. We observe a conventional collapsing of the Mott-Hubbard gap only for stoichiometric V_2_O3; the Ti disorder stabilizes the long-range antiferromagnetic order and a magnetic Slater gap. Moreover, we discover different P-T phase diagrams for the two systems, with a decoupling of the charge and spin degrees of freedom at the approach to the T=0, pressure-driven metal-insulator transition in pure V_2O_3.

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Alternate Title:Magnetic and transport studies of pure V2O3 under pressure
Additional Information:© 1994 The American Physical Society. Received 29 November 1993. The work at the University of Chicago was supported by the NSF Materials Research Laboratory under Grant No. DMR88-19860. S.A.C. acknowledges support from NSF Grant No. DMR92-04820. The work at Purdue University was supported under MISCON Grant No. DE-FG02-90ER45427.
Funding AgencyGrant Number
NSFDMR 88-19860
NSFDMR 92-04820
Department of Energy (DOE)DE-FG02-90ER45427
Issue or Number:12
Record Number:CaltechAUTHORS:20140707-163036581
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47005
Deposited By: George Porter
Deposited On:09 Jul 2014 20:05
Last Modified:10 Nov 2021 17:33

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