NMR relaxation rate in the superconducting state of the organic conductor κ-(BEDT-TTF)2Cu[N(CN)2]Br
K. Kanoda, K. Miyagawa, A. Kawamoto, Y. Nakazawa
DOI 10.1103/PhysRevB.54.76 · Physical Review B
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Abstract
The C13 nuclear spin-lattice relaxation rate, 13T1−1, has been measured in the superconducting state of κ-(BEDT-TTF)2Cu[N(CN)2]Br in a field parallel to the conducting layers. The 13T1−1 exhibits an abrupt decrease just below the transition temperature without any indication of the Hebel-Slichter coherence peak. By separation of the vortex-dynamics contribution to 13T1−1 with the use of NMR1, the quasiparticle contribution to 13T1−1 is found to follow a T3 law that is consistent with unconventional superconductivity with line nodes in gap parameter on the Fermi surface or highly anisotropic superconductivity. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (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 | onset |
| (BEDT-TTF)2Cu[N(CN)2]Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
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