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Electrodynamics near the Metal-to-Insulator Transition in V3O5

L. Baldassarre·A. Perucchi·E. Arcangeletti·D. Nicoletti·D. Di Castro·P. Postorino·V. A. Sidorov·S. Lupi
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Abstract

The electrodynamics near the metal-to-insulator transitions (MIT) induced, in V3O5 single crystals, by both temperature (T) and pressure (P) has been studied by infrared spectroscopy. The T- and P-dependence of the optical conductivity may be explained within a polaronic scenario. The insulating phase at ambient T and P corresponds to strongly localized small polarons. Meanwhile the T-induced metallic phase at ambient pressure is related to a liquid of polarons showing incoherent dc transport, in the P-induced metallic phase at room T strongly localized polarons coexist with partially delocalized ones. The electronic spectral weight is almost recovered, in both the T and P induced metallization processes, on an energy scale of 1 eV, thus supporting the key-role of electron-lattice interaction in the V3O5 metal-to-insulator transition.

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L. Baldassarre, A. Perucchi, E. Arcangeletti, D. Nicoletti, D. Di Castro, P. Postorino, V. A. Sidorov, S. Lupi. 2007-01-30. Electrodynamics near the Metal-to-Insulator Transition in V3O5. https://doi.org/10.1103/physrevb.75.245108

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