Pressure Dependence of the SDW Properties in the Organic Conductor (TMTSF)2PF6

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Abstract
The pressure dependence of the SDW properties in the titled material has been examined by using 1H-NMR technique. (1) The wave number which is incommensurate and very near the optimal nesting vector was found constant in the whole range of measured temperature and pressure. The SDW amplitude extrapolated to the absolute zero is pressure independent while the transition temperature is decreased under pressure. This is a feature peculiar to the nesting model proposed by Yamaji, and the first direct support of this model. (2) A clear anomaly in 1H-NMR relaxation rate suggesting a magnetic transition, well below the SDW transition temperature has been observed. The `new' transition temperature is 3.5 K at ambient pressure and remarkably pressure dependent, with the coefficient of -0.2 K/kbar.

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