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

S. Sahling (), J. C. Lasjaunias (), R. Mélin, P. Monceau and G. Reményi

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 59, issue 1, 9-17

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

Keywords: 75.30.Fv Spin-density waves; 75.40.Cx Static properties; 65.40.b Heat capacity (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00262-8

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