Fermi surface and in-plane anisotropy of the layered organic superconductor kappa(L)-(DMEDO-TSeF)(2)[Au(CN)(4)](THF) with domain structures

Article

关键词: HAAS-VAN-ALPHEN;    MAGNETIC BREAKDOWN;    KAPPA-(BEDT-TTF)(2)CU(NCS)(2);    OSCILLATIONS;    CONDUCTORS;   

DOI  :  10.1103/PhysRevB.83.012505

来源: SCIE

【 摘 要 】

The Fermi surface of the layered organic superconductor kappa(L)-(DMEDO-TSeF)(2)[Au(CN)(4)](THF) has been investigated, where DMEDO-TSeF is dimethyl (ethylenedioxy) tetraselenafulvalene. Band-structure calculations show that the fundamental Fermi surface is not circular, but elliptical with an eccentricity of 0.76, leading to a large orbital overlap in the extended Brillouin zone. This symmetry is lowered by a structural phase transition at 209 K at which domains form. The magnetic breakdown orbit is observed in the Shubnikov-de Haas oscillations under the low-field region, consistent with the small energy gap at the zone boundary. The observation of the Shubnikov-de Haas effect shows that the present compound has a clean electronic system despite the domain structures.

【 授权许可】

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