ISSN:
1434-6036
Keywords:
PACS. 75.30.Fv Spin density wave - 05.70.Ln Non-equilibrium thermodynamics, irreversible processes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050647
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