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Optical conductivity of V4O7 across its metal-insulator transition

I. Lo Vecchio, M. Autore, F. D'Apuzzo, F. Giorgianni, A. Perucchi, U. Schade, V. N. Andreev, V. A. Klimov, and S. Lupi
Phys. Rev. B 90, 115149 – Published 26 September 2014

Abstract

The optical properties of a V4O7 single crystal have been investigated from the high-temperature metallic phase down to the low-temperature antiferromagnetic insulating phase. The temperature-dependent behavior of the optical conductivity across the metal-to-insulator (MIT) transition can be explained in a polaronic scenario. Charge carriers form strongly localized polarons in the insulating phase, as suggested by a far-infrared charge gap abruptly opening at TMIT 237 K. In the metallic phase, instead, the presence of a Drude term is indicative of fairly delocalized charges with a moderately renormalized mass m*5me. The electronic spectral weight is almost recovered on an energy scale of 1 eV, which is much narrower than in the VO2 and V2O3 cases. Those findings suggest that electron-lattice interaction rather than electronic correlation is the driving force for the V4O7 metal-insulator transition.

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  • Received 1 July 2014
  • Revised 4 September 2014

DOI:https://doi.org/10.1103/PhysRevB.90.115149

©2014 American Physical Society

Authors & Affiliations

I. Lo Vecchio1, M. Autore2, F. D'Apuzzo3, F. Giorgianni2, A. Perucchi4, U. Schade5, V. N. Andreev6, V. A. Klimov6, and S. Lupi7

  • 1Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale A. Moro 2, I-00185 Roma, Italy
  • 2INFN and Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale A. Moro 2, I-00185 Roma, Italy
  • 3Istituto Italiano di Tecnologia and Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale A. Moro 2, I-00185 Roma, Italy
  • 4Elettra-Sincrotrone Trieste S.C.p.A. and INSTM UdR Trieste, S.S. 14 Km 163,5 in AREA Science Park, I-34149 Basovizza, Trieste, Italy
  • 5Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Elektronenspeicherring BESSY II, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
  • 6Ioffe Physical-Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ulica 26, St. Petersburg 194021, Russia
  • 7CNR-IOM and Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale A. Moro 2, I-00185 Roma, Italy

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Issue

Vol. 90, Iss. 11 — 15 September 2014

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