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The electronic structure and the phases of BaVS_3

Fazekas, P. and Penc, K. and Radnóczi, K. and Barišić, N. and Berger, H. and Forró, L. and Mitrović, S. and Gauzzi, A. and Demkó, L. and Kézsmárki, I. and Mihály, G. (2007) The electronic structure and the phases of BaVS_3. Journal of Magnetism and Magnetic Materials, 310 (2). pp. 928-934. ISSN 0304-8853.

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BaVS3 is a moderately correlated d-electron system with a rich phase diagram. To construct the corresponding minimal electronic model, one has to decide which d-states are occupied, and to which extent. The ARPES experiment presented here shows that the behavior of BaVS_3 is governed by the coexistence of wide-band (A_(1g)) and narrow-band (twofold degenerate E) d-electrons. We sketch a lattice fermion model which may serve as a minimal model of BaVS_3. This serves foremost for the understanding of the metal–insulator in pure BaVS_3 and its absence in some related compounds. The nature of the low-temperature magnetic order differs for several systems which may be described in terms of the same electron model. We describe several recent experiments which give information about magnetic order at high pressures. In particular, we discuss field-induced insulator-to-metal transition at slightly subcritical pressures, and an evidence for magnetic order in the high-pressure metallic phase. The phase diagram of Sr-doped BaVS_3 is also discussed. The complexity of the phases of BaVS_3 arises from the fact that it is simultaneously unstable against several kinds of instabilities.

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Additional Information:© 2007 Elsevier. Available online 30 October 2006. The authors acknowledge support by the Hungarian National Grants OTKA K62280, K62441, TS049881, and Bolyai 00239/04.
Funding AgencyGrant Number
Hungarian National GrantsOTKA K62280
Hungarian National GrantsK62441
Hungarian National GrantsTS049881
Hungarian National GrantsBolyai 00239/04
Subject Keywords:BaVS_3; Metal–insulator transition; Magnetic ordering
Issue or Number:2
Record Number:CaltechAUTHORS:20100827-105235147
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19683
Deposited By: Jason Perez
Deposited On:01 Sep 2010 18:33
Last Modified:03 Oct 2019 02:00

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