| Numéro |
J. Phys. IV France
Volume 114, April 2004
|
|
|---|---|---|
| Page(s) | 105 - 103 | |
| DOI | https://doi.org/10.1051/jp4:2004114020 | |
J. Phys. IV France 114 (2004) 105
DOI: 10.1051/jp4:2004114020
Spin and anion dynamics on (TMTSF) 2FSO 3, studied by NMR
K. Hiraki1, 1, H. Kang2, T. Nemoto1, H. Satsukawa1, T. Takahashi1, Y.J. Jo2, W. Kang2, 2 and O.H. Chung31 Department of Physics, Gakushuin University, Mejiro, Tokyo 171-8588, Japan
2 Department of Physics, Ewha University, Seoul 120-750, South Korea
3 Department of Physics, Sunchon University, Seoul 120-750, South Korea
Abstract
In order to characterise the electronic properties in
sub-phases of (TMTSF)
2FSO
3 under pressure,
77Se, and
19F
NMR Knight shift (
K) and relaxation rate (1/
T1) measurements were
performed at ambient and 0.82 GPa pressure. The insulating phase below the
metal-insulator transition (MIT) at 89 K at ambient pressure (AP) was
confirmed as a nonmagnetic state with a gap of
/
K.
This MIT is strongly coupled with anion ordering. The MIT temperature
decreases under pressure, and many electronic anomalies (or transitions)
have been observed from transport measurements. The reduction of density of
states in the metallic state by applying pressure was confirmed by the
analysis of
K and Korringa constant (1/
T1T). A nonmagnetic insulating
transition corresponding to the MIT at AP at 89 K, was observed at
45 K at 0.82 GPa. A spin (charge) gap in the insulating state at 0.82 GPa is
smaller (
/
K) than that at AP.
Key words. metal insulator transition - NMR
© EDP Sciences 2004