Strong-pinning phenomena and low-temperature heat capacitance anomaly in charge and spin-density wave compounds
Centre de Recherches sur
les Très Basses Températures, associé à l'UIF, CNRS, BP 166, 38042
Grenoble-Cédex 9, France
Accepted: 6 May 1996
In this note we discuss the occurrence of new metastable states in density wave ground state at low temperatures. Strong pinning centres located close to regions of commensurability give rise to plastic deformation of the DW. Relaxation times of these states are very long, in the range of hours, and they are at the origin of time-dependent heat capacitance as found experimentally.
PACS: 05.70.Ln – Nonequilibrium thermodynamics, irreversible processes / 63.50.+x – Vibrational states in disordered systems / 75.30.Fv – Spin-density waves
© EDP Sciences, 1996