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
DOI 10.1103/PhysRevB.66.224513 · Physical Review B
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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≃0K 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | onset |
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