Interlayer Charge Disproportionation in the Layered Organic Superconductor k_H-(DMEDO-TSeF)_2[Au(CN)_4](THF) with Polar Dielectric Insulating Layers

摘要

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, crystallograph-ically independent layers have different charge densities in a bulk single crystal. The electric dipole of tetrahydrofuran gives rise to interlayer charge disproportionation.