Spin dynamics of the organic linear chain compounds (TMTTF)2X (X=SbF6, AsF6, BF4, ReO4, and SCN)

B. Salameh, S. Yasin, M. Dumm, G. Untereiner, L. Montgomery, and M. Dressel
Phys. Rev. B 83, 205126 – Published 24 May 2011

Abstract

We have performed a comprehensive investigation on the spin susceptibility of the organic quantum-spin systems (TMTTF)2X (X=SbF6, AsF6, BF4, ReO4, and SCN) in the temperature range from T=1.8 up to 380 K. At elevated temperatures, the spin susceptibility at constant volume (χs)V can be described by a spin-12 antiferromagnetic Heisenberg chain with exchange constants J between 400 and 460 K. Below T100 K, slight deviations from the model occur due to interchain interaction. At low temperatures, the compounds undergo transitions to various ordered states of structural or magnetic origin that are discussed in detail. The spin-dimerized ground states of (TMTTF)2AsF6 and (TMTTF)2BF4 can be described by an alternating spin chain with a singlet-triplet energy gap Δσ(0)=34.8 and 52 K, respectively. In (TMTTF)2ReO4, however, the spin susceptibility in the anion-ordered state deviates from this model and obeys an activated law with Δσ=1100 K. In the antiferromagnetic ground states of (TMTTF)2SbF6 and (TMTTF)2SCN an increase of the spin susceptibility is observed at the lowest temperatures.

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  • Received 12 September 2010

DOI:https://doi.org/10.1103/PhysRevB.83.205126

©2011 American Physical Society

Authors & Affiliations

B. Salameh1,2, S. Yasin1, M. Dumm1, G. Untereiner1, L. Montgomery3, and M. Dressel1

  • 1Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
  • 2Department of Applied Physics, Tafila Technical University, Tafila, Jordan
  • 3Department of Chemistry, Indiana University, Bloomington, Indiana 47405, USA

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Vol. 83, Iss. 20 — 15 May 2011

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