Muon-spin-relaxation measurements of magnetic penetration depth in organic superconductors (BEDT-TTF)2-X: X=Cu(NCS)2 and Cu[N(CN)2]Br
L. P. Le, G. M. Luke, B. J. Sternlieb, W. D. Wu, Y. J. Uemura, J. H. Brewer, T. M. Riseman, C. E. Stronach, G. Saito, H. Yamochi, H. H. Wang, A. M. Kini, K. D. Carlson, J. M. Williams
DOI 10.1103/PhysRevLett.68.1923 · Physical Review Letters
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Abstract
The magnetic-field penetration depth λ in the organic superconductors κ-(BEDT-TTF)2 Cu(NCS)2 and κ-(BEDT-TTF)2 Cu[N(CN)2]Br has been measured over a wide temperature region 20 mK≤T≤15 K via the muon-spin-relaxation technique. Linear variation of λ with T at low temperatures, found in both systems, is consistent with anisotropic superconducting pairings with line nodes in the energy gap. In the latter compound, we observe flux depinning at T∼5 K, well below Tc=12 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.4 | Pressure not reported | unknown |
| (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. | 12 | Pressure not reported | unknown |
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