Vortex phase transition with decoupling of the adjacent layers in the organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Br
T. Shibauchi, M. Sato, S. Ooi, T. Tamegai
DOI 10.1103/PhysRevB.57.R5622 · Physical Review B
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Abstract
The temperature dependence of the local magnetic induction measured by using a miniature Hall probe shows a tiny step at a field-dependent temperature in the titled compound. This result implies that there exists a first-order phase transition in the vortex system in this organic superconductor as reported in high-Tc cuprates. The height of the step is of the order of 10 mG, from which the entropy change at the transition is estimated to be about 0.1 (kB/vortex)/layer. The measurements of the Josephson plasma resonance reveal that the interlayer phase coherence abruptly changes across the transition line, indicating the decoupling of the adjacent layers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.3 | Pressure not reported | unknown |
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