Decoupled critical dynamics of the TMTSF donor molecules in (TMTSF)2X organic superconductors

S. H. Kim; K. W. Lee; Cheol Eui Lee; W. Kang; K. S. Hong

doi:10.1103/PhysRevB.73.012505

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Decoupled critical dynamics of the TMTSF donor molecules in (TMTSF)2X organic superconductors

S. H. Kim, K. W. Lee, Cheol Eui Lee, W. Kang, K. S. Hong

DOI 10.1103/PhysRevB.73.012505 · Physical Review B

T1

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Abstract

We have studied a high-temperature phase transition in the organic superconductors (TMTSF)2PF6 and (TMTSF)2ClO4 (where TMTSF indicates tetramethyltetraselenafulvalene) by means of H1 laboratory-frame and rotating-frame nuclear magnetic resonance (NMR) relaxation measurements. The H1 NMR spin-lattice (T1) and spin-spin relaxation time (T2), representing dynamics of the TMTSF donor molecules, manifested a divergence associated with the structural phase transition at 160K. As no anomalies were observed in the F19 NMR T1 measurements representing dynamics of the PF6 anion, the TMTSF donor molecules and the anions are shown to be well decoupled regarding the critical fluctuations accompanying the structural phase transition.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(TMTSF)2PF6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(TMTSF)2ClO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown