Document Type

Article

Publication Date

January 1996

Publication Title

Molecular Crystals and Liquid Crystals

Volume

284

DOI

10.1080/10587259608037943

Keywords

Dynamic, phenomena, organic, metal, (BEDT-TTF)3Ta2F11

Disciplines

Chemistry | Physical Chemistry

Abstract

Dynamic electron spin resonance, ESR measurements suggest that this paramagnetic, layered organic metal behaves similarly to cuprate superconductors. There is a dynamic equilibrium between doublet, D and triplet, T* states near the transition temperature to superconductivity Tc= 10±3 K; antiferromagnetic, AF resonance is observed from room temperature to ≈ 150 K, in this temperature region the temperature dependence of the D Lorentzian ESR line widths obtains a first order rate constant for the disappearance of the state (k1 = 3.5 ×107 e−111/T/s) and T* ESR is not observed, it is detected only below 44 K when the lifetime of AF domains, τAFdecreases below 10-10s; the onset of superconductivity is ascertained by the appearance of an energy loss at exactly H=0 near 10 K and by the magnetization oscillations observed versus H below Tc when the samples are cooled in a non-zero field H; the fourfold increase in the relaxation time τ1 for the half field T* ESR absorption near 10 ±3 K is interpreted using the Gorter phenomenological relation τ1=CH/αH, CH and αH are the heat capacity and. lattice thermal contact coefficient of the spin system, at H.

Comments

This is a preprint of an article published in Molecular Crystals and Liquid Crystals Vol 284 in 1996. Version of record can be found here: https://doi.org/10.1080/10587259608037943

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