Nonmonotonic evolution of the charge gap in ZnV2O4 under pressure

A2+V2O4 spinels provide a unique opportunity for studying the evolution of the charge gap of Mott insulators that approach the itinerant electron limit under the application of external pressure. Here we report high-pressure resistivity and optical measurements in ZnV2O4 that provide unambiguous evi...

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Detalles Bibliográficos
Autores: Kuntscher, Christine, Rabia, Kaneez, Forthaus, M.K., Abd-Elmeguid, M. M., Rivadulla Fernández, José Francisco, Kato, Y., Batista, Cristian D.
Tipo de recurso: artículo
Fecha de publicación:2012
País:España
Institución:Universidad de Santiago de Compostela (USC)
Repositorio:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
Idioma:inglés
OAI Identifier:oai:minerva.usc.gal:10347/17033
Acceso en línea:http://hdl.handle.net/10347/17033
Access Level:acceso abierto
Descripción
Sumario:A2+V2O4 spinels provide a unique opportunity for studying the evolution of the charge gap of Mott insulators that approach the itinerant electron limit under the application of external pressure. Here we report high-pressure resistivity and optical measurements in ZnV2O4 that provide unambiguous evidence of an unusual nonmonotonic behavior of the charge gap, , as a function of pressure P. These unexpected results suggest that ZnV2O4 undergoes a crossover from a Mott insulator with a charge gap dominated by the on-site Coulomb repulsion U, to a second type of insulator in the high pressure regime. Our Monte Carlo simulations of the three-band Hubbard model relevant for ZnV2O4 reproduce the nonmonotonic behavior of (P) and provide a partial understanding of this exotic phenomenon

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