Heat capacity of the 1D SDW system (TMTTF)2Br and 2D CDW system 1T-TaS2 in magnetic field

The equilibrium heat capacity of the 1D system (TMTTF)2Br with spin density wave and the 2D system 1T-TaS2 with charge density wave were investigated in the temperature range between 0.07K and 10K and in a magnetic field up to 10T. For both materials an additional contribution to the heat capacity w...

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Bibliographic Details
Published in:Journal of physics. Conference series 2009-03, Vol.150 (4), p.042167
Main Authors: Sahling, S, Rémenyi, G, Lasjaunias, J C, Biljakovič, K, Mélin, R, Monceau, P
Format: Article
Language:English
Subjects:
Charge density waves
Heat
Magnetic fields
Physics
Relaxation time
Specific heat
Spin density waves
Temperature dependence
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Summary:The equilibrium heat capacity of the 1D system (TMTTF)2Br with spin density wave and the 2D system 1T-TaS2 with charge density wave were investigated in the temperature range between 0.07K and 10K and in a magnetic field up to 10T. For both materials an additional contribution to the heat capacity was found below 1K, which is proportional to T-2. This contribution is caused by low energy excitations with a broad spectrum of their relaxation time. The relaxation time is strongly temperature dependent and follows the Arrhenius law, i.e. the relaxation is a thermal activated process. For both materials the same absolute value of the T-2 term and the same activation energy Eaa/kB 0.5K was found. In difference to (TMTTF)2Br, where the heat capacity is strongly field dependent, the heat capacity of 1T-TaS2 is constant up to 5T.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/150/4/042167