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Titolo:
NMR investigation of spin density wave critical fluctuations in (TMTSF)(2)PF6
Autore:
Clark, WG; Hanson, ME; Alavi, B; Moulton, WG; Kuhns, P; Reyes, A;
Indirizzi:
Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA UnivCalif Los Angeles Los Angeles CA USA 90095 Los Angeles, CA 90095 USA Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA Florida State Univ Tallahassee FL USA 32306 ab, Tallahassee, FL 32306 USA
Titolo Testata:
SYNTHETIC METALS
fascicolo: 1-3, volume: 103, anno: 1999,
pagine: 2166 - 2167
SICI:
0379-6779(199906)103:1-3<2166:NIOSDW>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIMENSIONAL ORGANIC CONDUCTORS; ELECTRONIC CORRELATIONS; NUCLEAR-RELAXATION; (TMTSF)2PF6; SDW;
Keywords:
nuclear magnetic resonance; metal-insulator transition; magnetic phase transitions; organic conductors based on radical cation and or anion salts;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Clark, WG Univ Calif Los Angeles, Dept Phys & Astron, Box 951547, Los Angeles, CA 90095 USA Univ Calif Los Angeles Box 951547 Los Angeles CA USA 90095 5 USA
Citazione:
W.G. Clark et al., "NMR investigation of spin density wave critical fluctuations in (TMTSF)(2)PF6", SYNTH METAL, 103(1-3), 1999, pp. 2166-2167

Abstract

We report NMR measurements of the spin density wave (SDW) transition critical fluctuations in (TMTSF)(2)PF6 at 14.9 MHz and 0.98 GHz. This contribution to 1/T-1 is nearly independent of the magnetic field alignment and the frequency on both sides of the transition; above the transition at T-N it varies as \T - T-N\(theta) with theta = -0.75 +/- 0.08. These observations are consistent with dynamical scaling for the 3D Heisenberg model and show that the correlation time for the critical fluctuations responsible for T-1 is less than 2 x 10(-10) s for all temperatures studied. Such behavior is very different from that observed in the ordered SDW phase, where the dominant coupling is to SDW phasons whose characteristic times cover a very broad range.

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Documento generato il 10/07/20 alle ore 12:54:18