SE-77 NMR-STUDY OF THE SPIN-DENSITY-WAVE STATE IN (TMTSF)(2)PF6

Citation
S. Valfells et al., SE-77 NMR-STUDY OF THE SPIN-DENSITY-WAVE STATE IN (TMTSF)(2)PF6, Synthetic metals, 86(1-3), 1997, pp. 2109-2110
Citations number
8
Categorie Soggetti
Physics, Condensed Matter","Material Science","Polymer Sciences
Journal title
ISSN journal
03796779
Volume
86
Issue
1-3
Year of publication
1997
Pages
2109 - 2110
Database
ISI
SICI code
0379-6779(1997)86:1-3<2109:SNOTSS>2.0.ZU;2-V
Abstract
The quasi-1D conductor (TMTSF)(2)PF6 has a Spin Density Wave transitio n at 12 K. Previous H-1 NMR studies [1] have shown that the spin-latti ce relaxation rate, T-1, is finite and Korringa-like inside the Spin D ensity Wave phase down to about 4 K below which T-1 increases rapidly. We have measured the linewidth, T-1 and the spin-spin relaxation time , T-2, of the Se-77 nuclei which, as calculated by bandstructure, are in closer physical proximity to the electron conduction paths than the H-1 and, consequently, more strongly coupled to the conduction electr ons. Using fields up to 24 T, we find that while the lineshape is temp erature independent inside the SDW phase, the Se-77 T-1 exhibits the s ame qualitative behavior as the H-1 T-1, and T-2 increases abruptly at approximate to 4 K. We discuss this result in terms of the Fermi surf ace of the system.