Abstract
We have measured the heat capacity and the heat release of the quasi-1D conductor (TMTSF)2PF6 in its spin-density wave ground state. Below 1 K the presence of low-energy excitations is at the origin of slow heat release over time scales from about 1 s up to 105 s. In a first attempt, we analyzed this behaviour with a modified version of the standard tunneling model used in the case of amorphous solids, introducing a short-time cut-off in the distribution of the relaxation times of tunneling states. A remarkable feature of the heat release in (TMTSF)2PF6 is its high absolute value, which is 3–4 orders of magnitude larger than in structural glasses. The heat capacity contains a Schottky and a quasi-linear term.
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Lasjaunias, J.C., Sahling, S., Biljakovic, K. et al. Long-Time Heat Release in the Quasi-1D Conductor (TMTSF)2PF6 at Low Temperatures. Journal of Low Temperature Physics 130, 25–43 (2003). https://doi.org/10.1023/A:1021893201250
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DOI: https://doi.org/10.1023/A:1021893201250