NMR studies of exotic members of bechgaard salt with non- centrosymmetric anions under pressure

Hidetaka Satsukawa; Haeyong Kang; Ko Ichi Hiraki; Toshihiro Takahashi; Younjung Jo; Woun Kang; Ok Hee Chung

doi:10.1016/j.synthmet.2005.07.320

NMR studies of exotic members of bechgaard salt with non- centrosymmetric anions under pressure

Hidetaka Satsukawa, Haeyong Kang, Ko Ichi Hiraki, Toshihiro Takahashi, Younjung Jo, Woun Kang, Ok Hee Chung

Department of Physics

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The electronic properties of (TMTSF)₂FSO₃ have been investigated under pressure of 0.65 GPa by measuring ⁷⁷Se-NMR lineshape, spin-lattice relaxation rate (T1-1) and spin-spin relaxation rate (T1-1) measurements on a single crystal sample. The NMR signal was found abnormally broadened below 90 K. Below 40 K, a narrow component appears and coexists with the broader one. The temperature dependence of T1-1 suggests that the broader component comes from a metallic phase and the narrow one from an insulating phase. The activation energy determined for the insulating component was found three times lower than the value found at ambient pressure. From the T1-1 measurements, the broadening of the metallic component was confirmed as inhomogeneous. An unusual double peak anomaly of T1-1 suggests the existence of extremely slow fluctuations of the inhomogeneous local fields below 90 K at this pressure.

Original language	English
Pages (from-to)	417-420
Number of pages	4
Journal	Synthetic Metals
Volume	153
Issue number	1-3
DOIs	https://doi.org/10.1016/j.synthmet.2005.07.320
State	Published - 21 Sep 2005

Keywords

Metal-insulator phase transition
Nuclear magnetic resonance spectroscopy
Organic conductors based on radical cation and/or anion salts

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10.1016/j.synthmet.2005.07.320

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title = "NMR studies of exotic members of bechgaard salt with non- centrosymmetric anions under pressure",

abstract = "The electronic properties of (TMTSF)2FSO3 have been investigated under pressure of 0.65 GPa by measuring 77Se-NMR lineshape, spin-lattice relaxation rate (T1-1) and spin-spin relaxation rate (T1-1) measurements on a single crystal sample. The NMR signal was found abnormally broadened below 90 K. Below 40 K, a narrow component appears and coexists with the broader one. The temperature dependence of T1-1 suggests that the broader component comes from a metallic phase and the narrow one from an insulating phase. The activation energy determined for the insulating component was found three times lower than the value found at ambient pressure. From the T1-1 measurements, the broadening of the metallic component was confirmed as inhomogeneous. An unusual double peak anomaly of T1-1 suggests the existence of extremely slow fluctuations of the inhomogeneous local fields below 90 K at this pressure.",

keywords = "Metal-insulator phase transition, Nuclear magnetic resonance spectroscopy, Organic conductors based on radical cation and/or anion salts",

author = "Hidetaka Satsukawa and Haeyong Kang and Hiraki, {Ko Ichi} and Toshihiro Takahashi and Younjung Jo and Woun Kang and Chung, {Ok Hee}",

year = "2005",

month = sep,

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doi = "10.1016/j.synthmet.2005.07.320",

language = "English",

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AU - Satsukawa, Hidetaka

AU - Kang, Haeyong

AU - Hiraki, Ko Ichi

AU - Takahashi, Toshihiro

AU - Jo, Younjung

AU - Kang, Woun

AU - Chung, Ok Hee

PY - 2005/9/21

Y1 - 2005/9/21

N2 - The electronic properties of (TMTSF)2FSO3 have been investigated under pressure of 0.65 GPa by measuring 77Se-NMR lineshape, spin-lattice relaxation rate (T1-1) and spin-spin relaxation rate (T1-1) measurements on a single crystal sample. The NMR signal was found abnormally broadened below 90 K. Below 40 K, a narrow component appears and coexists with the broader one. The temperature dependence of T1-1 suggests that the broader component comes from a metallic phase and the narrow one from an insulating phase. The activation energy determined for the insulating component was found three times lower than the value found at ambient pressure. From the T1-1 measurements, the broadening of the metallic component was confirmed as inhomogeneous. An unusual double peak anomaly of T1-1 suggests the existence of extremely slow fluctuations of the inhomogeneous local fields below 90 K at this pressure.

AB - The electronic properties of (TMTSF)2FSO3 have been investigated under pressure of 0.65 GPa by measuring 77Se-NMR lineshape, spin-lattice relaxation rate (T1-1) and spin-spin relaxation rate (T1-1) measurements on a single crystal sample. The NMR signal was found abnormally broadened below 90 K. Below 40 K, a narrow component appears and coexists with the broader one. The temperature dependence of T1-1 suggests that the broader component comes from a metallic phase and the narrow one from an insulating phase. The activation energy determined for the insulating component was found three times lower than the value found at ambient pressure. From the T1-1 measurements, the broadening of the metallic component was confirmed as inhomogeneous. An unusual double peak anomaly of T1-1 suggests the existence of extremely slow fluctuations of the inhomogeneous local fields below 90 K at this pressure.

KW - Metal-insulator phase transition

KW - Nuclear magnetic resonance spectroscopy

KW - Organic conductors based on radical cation and/or anion salts

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JO - Synthetic Metals

JF - Synthetic Metals

IS - 1-3

ER -

NMR studies of exotic members of bechgaard salt with non- centrosymmetric anions under pressure

Abstract

Keywords

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