Article Dans Une Revue Synthetic Metals Année : 1988

Spin-peierls and antiferromagnetic transition temperatures in (TMTTF)2PF6: EPR and NMR measurements and theory

L.G Caron
  • Fonction : Auteur
P Butaud
  • Fonction : Auteur
C Bourbonnais
  • Fonction : Auteur
D Jérôme
K Bechgaard
  • Fonction : Auteur

Résumé

We report on EPR measurements on (TMTTF)2PF6 which address the evolution of the spin-Peierls transition temperature Tc as a function of pressure. The line intensity was used as a probe of the magnetic susceptibility, and therefore of the density of states at the Fermi level. This density drops in the spin-Peierls regime. The extrapolated onset of the gap is used as a measurement of Tc. Using these results and previous NMR data on the antiferromagnetic transition temperature, a complete phase diagram is presented. It will be explained using a model involving an interacting electron gas coupled to acoustic phonons. The various parameters are obtained from available experimental results while their pressure and temperature dependence is suggested as a theoretical model. The interchain interactions (exchange and charge) are deduced from a fit of the transition temperature at 0 and 13 kbar. A very satisfactory phase diagram is deduced.

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hal-04944401 , version 1 (26-03-2025)

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L.G Caron, F Creuzet, P Butaud, C Bourbonnais, D Jérôme, et al.. Spin-peierls and antiferromagnetic transition temperatures in (TMTTF)2PF6: EPR and NMR measurements and theory. Synthetic Metals, 1988, 27 (3-4), pp.123-128. ⟨10.1016/0379-6779(88)90134-8⟩. ⟨hal-04944401⟩
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