Partially ordered vortex lattices in the high-field low-temperature mixed state of quasi-two-dimensional organic superconductors
A. Maniv, V. Zhuravlev, T. Maniv, O. Ofer, R. Rommel, J. Müller, J. E. Sonier
DOI 10.1103/PhysRevB.91.134506 · Physical Review B
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Abstract
We report the results of high-field, low-temperature μSR measurements of the quasi-two-dimensional organic superconductors κ−(ET)2Cu(NCS)2, and κ−(ET)2Cu[N(CN)2]Br. The μSR lineshapes for these compounds indicate the existence of partially ordered vortex lattice phases in the high-magnetic-field regime, up to 2.5 T for the former compound and 4 T for the latter compound. The observed sharp loss of order is found to be consistent with a vortex-lattice melting transition that is predicted by numerical simulations of weakly coupled layers of pancake vortices. It is argued that the robustness of the partially ordered vortex lattice phases could be due to strong flux-line pinning by a dilute ensemble of defects.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(ET)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.3 | Pressure not reported | unknown |
| κ-(ET)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.5 | Pressure not reported | unknown |
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