Abstract:
We report on specific heat measurements of the quasi-one-dimensional organic salt (TMTSF)2AsF6 in its spin density wave state between 75 mK and 7 K. Similarly to (TMTSF)2PF6, we find discontinuities in the lattice contribution at 1.9 K an d 3.5 K ascribed to sub-spin density wave phases. Time-dependent effects due to dynamics of low-energy excitations in metastable states occur only below 0.2 K which yields an activation energy for the equilibrium energy relaxation process of 0.34 K, 4-5 times smaller than found for (TMTSF)2PF6. Finally the reduction of the low-energy excitations contribution to the specific heat in comparison to PF6 reveals an intermediate cubic-like regime between 0.25 and 0.5 K that we tentatively describe as the phason contribution of the incommensurate spin density wave modulation.
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Received: 17 March 1998 / Revised: 27 July 1998 / Accepted: 22 September 1998
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Lasjaunias, JC., Biljaković, K., Starešinić, D. et al. Low temperature thermodynamical properties of the organic chain conductor (TMTSF)AsF . Eur. Phys. J. B 7, 541–550 (1999). https://doi.org/10.1007/s100510050647
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DOI: https://doi.org/10.1007/s100510050647