Hall effect measurements in the vortex state of the quasi two-dimensional organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 are reported. A sign reversal phenomenon of the Hall resistivity is observed in the vortex state. The Hall conductivity changes monotonically with field and temperature in the vortex state, which is in contrast to the peak of the Hall resistivity observed there. The Hall conductivity is described as σxy = σxyn + σxyf, where σxyn results from the quasiparticle and σxyf the motion of the vortex. The expression has been theoretically proposed. In low fields, σxyf is dominant in the Hall conductivity, which diverges to infinity as -1/(H - H*), where H* is a characteristic field in which the resistivity becomes zero.
|ジャーナル||Science Reports of the Rerearch Institutes Tohoku University Series A-Physics|
|出版ステータス||Published - 1996 5月|
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