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Equilibrium low temperature heat capacity of the spin density wave compound (TMTTF) 2 Br: effect of a magnetic field

Author

Listed:
  • S. Sahling
  • J. C. Lasjaunias
  • R. Mélin
  • P. Monceau
  • G. Reményi

Abstract

We have investigated the effect of the magnetic field (B) on the very low-temperature equilibrium heat capacity c eq of the quasi-1 D organic compound (TMTTF) 2 Br, characterized by a commensurate Spin Density Wave (SDW) ground state. Below 1 K, c eq is dominated by a Schottky-like A S T -2 contribution, very sensitive to the experimental time scale, a property that we have previously measured in numerous DW compounds. Under applied field (in the range 0.2–7 T), the equilibrium dynamics, and hence c eq extracted from the time constant, increases enormously. For B ≥ 2–3 T, c eq varies like B 2 , in agreement with a magnetic Zeeman coupling. Another specific property, common to other Charge/Spin density wave (DW) compounds, is the occurrence of metastable branches in c eq , induced at very low temperature by the field exceeding a critical value. These effects are discussed within a generalization to SDWs in a magnetic field of the available Larkin-Ovchinnikov local model of strong pinning. A limitation of the model when compared to experiments is pointed out. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Suggested Citation

  • S. Sahling & J. C. Lasjaunias & R. Mélin & P. Monceau & G. Reményi, 2007. "Equilibrium low temperature heat capacity of the spin density wave compound (TMTTF) 2 Br: effect of a magnetic field," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 59(1), pages 9-17, September.
    • Handle: RePEc:spr:eurphb:v:59:y:2007:i:1:p:9-17
    DOI: 10.1140/epjb/e2007-00262-8
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