Evidence for the role of fluxoids in enhancing NMR spin-lattice relaxation and implications for intrinsic pinning of the flux lattice in organic superconductors
S. M. De Soto, C. P. Slichter, H. H. Wang, U. Geiser, J. M. Williams
DOI 10.1103/PhysRevLett.70.2956 · Physical Review Letters
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Abstract
The authors report H1 NMR spin-lattice relaxation rates, T1−1, in the quasi-2D organic superconductor κ-(ET)2Cu[N(CN)2]Br (Tc=11.6 K), for an aligned single crystal. The relaxation in the normal-state obeys the Korringa law (T1T=const). In the superconducting state, for weak fields (H0=0.59 T), T1−1 is greatly enhanced and displays strong orientation dependence for field directions nearly parallel to the superconducting layers. This behavior indicates that motion of the fluxoid system is the cause of the extra relaxation, and is evidence for a ‘‘lock-in’’ transition of the flux lattice.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| 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. | 11.6 | Pressure unresolved | unknown |
| κ-(ET)2Cu[N(CN)2]Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.8 | 0.03 GPa | 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. | 10.4 | 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. | 8.8 | Pressure not reported | unknown |
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