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Effect of charge-density wave on superconducting critical temperature

✍ Scribed by Masahiko Ichimura; Mitsutaka Fujita; Kenji Nakao

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
360 KB
Volume
165-166
Category
Article
ISSN
0921-4526

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✦ Synopsis

The effect of charge density wave(CDW) on superconducting critical temperature(T e ) is examined within a meanfield approximation. When the band structure does not satisfy the perfect-nesting condition for the commensurate CDW, the metallic CDW states can appear. We study the phase diagrams of the imperfect-nesting CDW with the both cases of canonical and grand-canonical ensembles. We compare two cases and calculate the T e on two phase diagrams. The behavior of the T c and the CDW gap on our simple model shows the qualitavive similarity to the obsreved one in the real system, BaPb lx Bi x 0 3 .

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We study a simple tight-binding (Hubbard) model for electrons interacting via a short range attractive potential. We show that on a cubic lattice, for a half-filled band the ground state may feature both superconductivity and a charge density wave. We examine the response of such a ground state to a