Correlation between non-Fermi-liquid behavior and antiferromagnetic fluctuations in (TMTSF)(2)PF6 observed using C-13-NMR spectroscopy

Article

关键词: ORGANIC CONDUCTOR;    RELAXATION;    NMR;    HEXAFLUOROPHOSPHATE;    SUPERCONDUCTORS;    (TMTSF)2PF6;    TRANSITION;    PHYSICS;    TMTSF;   

DOI  :  10.1103/PhysRevB.84.045123

来源: SCIE

【 摘 要 】

In the temperature-pressure phase diagram of the organic superconductor (TMTSF)(2)PF6 (TMTSF: tetramethyltetraselenafulvalene), the superconducting phase and the spin-density-wave (SDW) phase are adjacent to each other. This salt exhibits non-Fermi-liquid (NFL) behavior and superconductivity under pressure. Its superconductive property does not exist at higher pressures where Fermi-liquid (FL) behavior is exhibited. In order to investigate the origin of NFL behavior, systematic C-13-NMR measurement of this salt has been assessed under pressure in a wide temperature range. At low temperatures, (T1T)(-1) increases, and this increase is suppressed by the increasing pressure. These results suggest that applying pressure alters the electron system from the NFL to the FL state, and that antiferromagnetic fluctuations contribute to the origin of NFL behavior. The connection between the emergence of FL behavior and the disappearance of superconductivity suggests that the SDW fluctuation relates to the mechanism of the superconductivity in (TMTSF)(2)PF6.

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