Abstract:
The basic equations that determine the thermodynamic properties of the
condensed state of a charge density wave – the order parameter, energy
gap, critical transition temperature – are obtained, together with an expression for the magnetic susceptibility. Allowance is made for the deviation from half-filling of the band, umklapp processes, and the influence of impurities. The obtained equations differ from the case
of band half-filling, and also from the results of the theory of superconducting alloys with paramagnetic impurity. The limit of low impurity concentrations is considered. It is shown that with increasing impurity concentration there is a decrease in the Peierls transition
temperature, which also depends strongly on the parameter $\mu$ that determines
the deviation from band half-filling. At $T=0$, the paramagnetic
susceptibility $\chi$ vanishes in the region of low impurity concentrations
and increases with increasing temperature. The temperature dependence
of $\chi$ in the case $\mu\ne0$ is very different from the half-filling case
($\mu=0$).
Fulltext:
PDF file (1072 kB)
