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Phys Rev Lett. 2012 Oct 5;109(14):147005. Epub 2012 Oct 4.

Interlayer charge disproportionation in the layered organic superconductor κ(H)-(DMEDO-TSeF)2[Au(CN)4](THF) with polar dielectric insulating layers.

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1
Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan. kawamoto@o.cc.titech.ac.jp

Abstract

We report the molecular dipole effect on conduction electrons in the title superconductor. The angular-dependent magnetoresistance has a peak for fields nearly parallel to the conducting layer, and the peak width scales as the field component perpendicular to the layer, indicating incoherent interlayer transport. However, two closed Fermi surfaces are observed in quantum oscillation. Accordingly, crystallographically independent layers have different charge densities in a bulk single crystal. The electric dipole of tetrahydrofuran gives rise to interlayer charge disproportionation.

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