Magnetic penetration depth and fluxon-line dynamics in the organic superconductor κ-[BEDT-TTF]2Cu[NCS]2
D. R. Harshman, A. T. Fiory, R. C. Haddon, M. L. Kaplan, T. Pfiz, E. Koster, I. Shinkoda, D. Ll. Williams
DOI 10.1103/PhysRevB.49.12990 · Physical Review B
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Abstract
The muon-spin-relaxation (μSR) technique has been used to study the internal field modulation dynamics of fluxons in crystals of κ-[BEDT-TTF]2Cu[NCS]2 (Tc≊10.5 K). The data exhibit a strong field dependence for applied fields in the range 129 Oe≤‖Hext‖≤4 kOe, which is attributed to a combination of vortex motion, finite core size effects, and pinning. In low fields (‖Hext‖=129 Oe), the data exhibit a flux-pinning transition at Tx∼5 K, as evidenced by a peak in the second moment of the local field distribution at ∼5 K accompanied by an enhanced minimum in the first moment at the same temperature. In higher fields (‖Hext‖=750 Oe, 3 kOe, and 4 kOe), where the effects of motion and pinning are minimized, the symmetry of the underlying gap function is confirmed as s wave. Corrections for finite fluxon core, finite mean free path, and flux-lattice disorder were applied in determining the London penetration depth, λL(bc)(0)=7680±700 Å.
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. | 10.5 | Pressure unresolved | unknown |
| [TMTSF]2ClO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure unresolved | unknown |
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