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Time-dependent specific heat below 1 K in the spin-density-wave state of (TMTSF)_2PF_6

Large time-dependence effects have been measured below 1 K in the specific heat of the density-wave (SDW)compound (TMTSF)_PF_6, well below its glass transition temperature at 3.5 K. These effects indicate that most of the low-energy excitations characteristic of the disordered nature of the SDW subsystem are decoupled from the phonon bath for t greater than or similar to 1 s. A comparison is done with the related slow heat release observed over similar long time scales (up to 10^4-10^5 s) in structurally disordered materials.

Low-energy excitations. Relaxation. Model.

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