Non-Fermi-liquid behavior of the organic superconductor κ−(BEDT-TTF)4Hg2.89Br8 probed by C13 NMR
Yoshihiro Eto, Megumi Itaya, Atsushi Kawamoto
DOI 10.1103/PhysRevB.81.212503 · Physical Review B
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Abstract
An organic salt, κ−(BEDT-TTF)4Hg2.89Br8 exhibits superconductivity at 4.3 K under ambient pressure suggesting non-Fermi-liquid (NFL) behavior just above Tc. Whereas most organic superconductors are controlled by the bandwidth in the half-filled electron system, this salt realizes a carrier doping away from the half-filled electron system as well as high-Tc cuprates. In order to investigate the origin of NFL behavior, we assessed C13-NMR measurements in this salt and observed the antiferromagnetic fluctuation as same as in an organic antiferromagnet κ−(BEDT-TTF)2Cu[N(CN)2]Cl with the gap structure. Application of pressure suppresses (T1T)−1 and shifts its maximum to lower temperatures with (T1T)−1 becoming constant above 2 GPa. These results suggest that applying pressure alters the electron system from NFL to FL state and that antiferromagnetic fluctuations contribute to the origin of NFL behavior.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)4Hg2.89Br8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.3 | Pressure unresolved | unknown |
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