Quantum vortex melting and phase diagram in the layered organic superconductor κ-(BEDT-TTF)2Cu(NCS)2
S. Uji, Y. Fujii, S. Sugiura, T. Terashima, T. Isono, J. Yamada
DOI 10.1103/PhysRevB.97.024505 · Physical Review B
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Abstract
Resistance and magnetic torque measurements have been performed to investigate vortex phases for a layered organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene], which is modeled as stacks of Josephson junctions. At 25 mK, the out-of-plane resistivity increases at 0.6 T, has a step feature up to 4 T, and then increases again, whereas the in-plane resistivity monotonically increases above 4 T. The results show that both pancake vortices (PVs) and Josephson vortices (JVs) are in solid phases for μ0H<0.6 T, but only JVs are in a liquid phase for 0.6<μ0H<4 T. For μ0H>4 T, both PVs and JVs are in liquid phases. These melting transitions are predominantly induced by quantum fluctuations (not by thermal fluctuations). In the magnetic torque curves, the irreversibility transition is clearly observed, roughly corresponding to the melting transition of the PVs but no anomaly is found at the JV melting transition. The detailed vortex phase diagram is determined in a wide temperature region.
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. | 9 | Pressure not reported | unknown |
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