Resistivity, density of electronic states, and superconducting transition temperature in density wave compounds with imperfect nesting

A. V. Tsvetkova; Ya. I. Rodionov; P. D. Grigoriev

doi:10.1103/PhysRevB.111.205141

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Resistivity, density of electronic states, and superconducting transition temperature in density wave compounds with imperfect nesting

A. V. Tsvetkova, Ya. I. Rodionov, P. D. Grigoriev

DOI 10.1103/PhysRevB.111.205141 · Physical Review B

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Abstract

We study the effects of imperfect nesting in the density wave (DW) state on various electronic properties within a simple two-dimensional tight-binding model. The discussed model reflects the main features of quasi-1D metals where the DW emerges. We show that a DW with imperfect nesting leads to unusual singularities in the quasiparticle density of states and to a power-law renormalization of the superconducting critical temperature. Our results are derived at arbitrary large antinesting and may help to understand the phase diagram of the wide class of density wave superconductors. We also compute the conductivity tensor in a wide temperature range, including the DW transition, and obtain a satisfactory agreement with the experimental data on rare-earth trichalcogenides and many other DW materials.