Stretched exponential spin relaxation in organic superconductors
Joseph Gezo, Tak-Kei Lui, Brian Wolin, Charles P. Slichter, Russell Giannetta, John A. Schlueter
DOI 10.1103/PhysRevB.88.140504 · Physical Review B
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Abstract
Proton NMR measurements on the organic superconductor κ-(ET)2Cu[N(CN)2]Br [where ET represents bis(ethylenedithio)tetrathiafulvalene] TC=11.6K exhibit stretched exponential spin-lattice relaxation below T≈25K, suggestive of an inhomogeneous magnetic phase that develops in the normal state and coexists with superconductivity. The onset of this phase coincides approximately with a large normal-state Nernst signal reported previously. By contrast, the closely related superconductor κ-(ET)2Cu(NCS)2 TC=10.5K shows single exponential spin-lattice relaxation and a conventional Nernst effect. The temperature range of TC < T < 30 K encompasses several phenomena in the κ-(ET)2X conductors, including changes in conduction-electron-spin resonance, electronic phase separation, and the onset of antiferromagnetic order. Analogous behavior in La2−xSrxCuO4 suggests that a spin glass or density wave may develop in κ-(ET)2Cu[N(CN)2]Br.
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 not reported | unknown |
| κ-(ET)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.5 | Pressure not reported | unknown |
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