Quasiparticle evolution and pseudogap formation in V2O3: An infrared spectroscopy study

L. Baldassarre, A. Perucchi, D. Nicoletti, A. Toschi, G. Sangiovanni, K. Held, M. Capone, M. Ortolani, L. Malavasi, M. Marsi, P. Metcalf, P. Postorino, and S. Lupi
Phys. Rev. B 77, 113107 – Published 28 March 2008

Abstract

The infrared conductivity of V2O3 is measured in the whole phase diagram. Quasiparticles appear above the Néel temperature TN and eventually disappear further enhancing the temperature, leading to a pseudogap in the optical spectrum above 425K. Our calculations demonstrate that this loss of coherence can be explained only if the temperature dependence of lattice parameters is considered. V2O3 is therefore effectively driven from the “metallic” to the “insulating” side of the Mott transition as the temperature is increased.

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  • Received 14 October 2007

DOI:https://doi.org/10.1103/PhysRevB.77.113107

©2008 American Physical Society

Authors & Affiliations

L. Baldassarre1, A. Perucchi1,2, D. Nicoletti1, A. Toschi3, G. Sangiovanni3, K. Held3, M. Capone4, M. Ortolani5, L. Malavasi6, M. Marsi7, P. Metcalf8, P. Postorino1, and S. Lupi1

  • 1CNR-INFM COHERENTIA and Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale Aldo Moro 2, I-00185 Roma, Italy
  • 2Sincrotrone Trieste S.C.p.A., Strada Statale 14 Km 163.5, Area Science Park, 34012 Basovizza Trieste, Italy
  • 3Max-Planck Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 4SMC, CNR-INFM and Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale Aldo Moro 2, I-00185 Roma, Italy and ISC-CNR, Via dei Taurini 19, I-00185 Roma, Italy
  • 5Istituto di Fotonica e Nanotecnologie, IFN-CNR, Via Cineto Romano 42, 00156 Roma, Italy
  • 6Dipartimento di Chimica Fisica “M. Rolla,” INSTM and IENI-CNR, Università di Pavia, Viale Taramelli 16, I-27100 Pavia, Italy
  • 7Laboratoire de Physique des Solides, UMR 8502-Université Paris-Sud, Bâtiment 510, 91405 Orsay Cedex, France
  • 8Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA

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Issue

Vol. 77, Iss. 11 — 15 March 2008

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