Showing papers by "László Forró published in 1987"

Pressure dependence of the conduction-electron-spin-resonance linewidth of the alpha and beta phases of di-bis(ethylene- diothiolo)tetrathiafulvalene triiodide.

Abstract: We report conduction-electron-spin-resonance linewidth (ΔH) measurements of the α and β phases of the organic conductor di-bis(ethylenediothiolo)tetrathiafulvalene triiodide [(BEDT-TTF)2I3] in the 80–300 K temperature range under applied pressures of up to 5 kbar. ΔH increases under pressure in contrast to the predictions of the Elliot formula for the spin relaxation in metals. The pressure derivative d(lnΔH)/dP is -5.5±1%/kbar and 9.8±1%/kbar for the α and β phases of (BEDT-TTF)2I3 respectively.

Conduction electron spin resonance measurements on TTF-TNNQ and (TMTTF)2BF4 under hydrostatic pressure

Abstract: Conduction electron spin resonance (CESR) measurements under hydrostatic pressure on two chain organic conductor tetrathiofulvalene-tetracyanoquinodimethane (TTF-TCNQ) and single chain organic conductor bis tetramethyl-tetrathiofulvalene borontetrafluorid ((TMTTF) 2 BF 4 ) are presented. In both cases the CESR linewidth increases strongly with pressure in contradiction with the Elliott-mechanism for spin relaxation. The g-factor is pressure independent for both compounds while the spin susceptibility decreases by −8±1% kbar for TTF-TCNQ and −3±1% kbar for (TMTTF) 2 BF 4 at room temperature Dans les deux cas, la raie de resonance s'elargit sous l'effet de la pression, en contradiction avec le mecanisme propose par Elliott pour la relaxation de spin. Le facteur g ne depend pas de la pression alors que la susceptibilite de spin diminue dans les deux composes