Low-temperature vortex liquid states induced by quantum fluctuations in the quasi-two-dimensional organic superconductor κ-(BEDT-TTF)2Cu(NCS)2

T. Sasaki, T. Fukuda, T. Nishizaki, T. Fujita, N. Yoneyama, N. Kobayashi, W. Biberacher

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We report the transport properties in the vortex liquid states induced by quantum fluctuations at low temperature in the layered organic superconductor κ-(BEDT-TTF)2Cu(NCS)2. A steep drop of the resistivity observed below about 1 K separates the liquid state into two regions. In the low-resistance state at lower temperature, a finite resistivity with weak temperature dependence persists down to 100 mK at least. The finite resistivity in the vortex state at T ≃ O K indicates the realization of quantum vortex liquid assisted by the strong quantum fluctuations instead of the thermal one. A possible origin for separating these liquid states is a remnant vortex melting line at the original position, which is obscured and suppressed by the quantum fluctuations. A nonlinear behavior of the in-plane resistivity appears at large current density in only the low-resistance state, but not in another vortex liquid state at higher temperature, where the thermal fluctuations are dominant. The transport properties in the low-resistance state are well understood in the vortex slush concept with a short-range order of vortices. Thus the low-resistance state below 1 K is considered to be a novel quantum vortex slush state.

Original languageEnglish
Article number224513
Pages (from-to)2245131-2245137
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number22
Publication statusPublished - 2002 Dec 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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