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Low temperature thermodynamical properties of the organic chain conductor (TMTSF)AsF |
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| Authors: | J-C Lasjaunias K Biljaković D Starešinić P Monceau S Takasaki J Yamada S-I Nakatsuji H Anzai |
| Institution: | (1) Centre de Recherches sur les Très Basses Températures (Associéà l'Université Joseph Fourier, CNRS.), B.P. 166, 38042 Grenoble Cedex 9, France, FR;(2) Institute of Physics, POB 304, HR 10001 Zagreb, Croatia, HR;(3) Department of Material Science, Faculty of Science, Himeji Institute of Technology, Kamigohri, Hyogo 678-12, Japan, JP |
| 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. Received: 17 March 1998 / Revised: 27 July 1998 / Accepted: 22 September 1998 |
| Keywords: | PACS 75 30 Fv Spin density wave - 05 70 Ln Non-equilibrium thermodynamics irreversible processes |
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