Temperature-pressure phase diagram and electronic properties of the organic metal κ-(BETS)<inf>2</inf>Mn[N(CN)<inf>2</inf>]<inf>3</inf>

V. N. Zverev, M. V. Kartsovnik, W. Biberacher, S. S. Khasanov, R. P. Shibaeva, L. Ouahab, L. Toupet, N. D. Kushch, E. B. Yagubskii, E. Canadell

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    Abstract

    The crystal and electronic band structures as well as the transport properties of the recently synthesized layered radical cation salt κ-(BETS)2Mn[N(CN)2]3 are investigated. It is shown that this salt is more anisotropic in the plane of conducting layers than other κ phases, a feature which noticeably influences its physical behavior. A phase transition resulting in the formation of an incommensurate superstructure below 102 K has been found. At temperature below 30 K a metal-insulator transition is observed. We argue that the transition is associated with electronic interactions rather than with structural changes. The T-P phase diagram has been studied under 4He gas pressure up to 2.5 kbar. At moderately high pressure P≈0. kbar the metal-insulating transition is suppressed and the crystal becomes superconducting with Tc ≈5.7 K. In the pressurized metallic state, Shubnikov-de Haas oscillations have been found, revealing a very small closed Fermi surface with a high-effective cyclotron mass influenced by many-body interactions. © 2010 The American Physical Society.
    Original languageEnglish
    Article number155123
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume82
    Issue number15
    DOIs
    Publication statusPublished - 18 Oct 2010

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