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Eliashberg theory of superconductivity with repulsive coulomb enhancement

✍ Scribed by F. Marsiglio

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
804 KB
Volume
160
Category
Article
ISSN
0921-4534

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✦ Synopsis

We study the effects of a particular momentum dependence of the Coulomb repulsion, along with the standard electron-phonon interaction, on r, within Eliashberg theory. The particular momentum dependence arises from the recently proposed "hole mechanism" of superconductivity. In that mechanism high T, is achieved strictly through Coulomb interactions. Here we find that the electron-phonon interaction can either enhance or suppress T, depending on the parameter regime involved. In this manner experimental signatures of the electron-phonon interaction can be understood as only partially responsible for T,. It is suggested that the other contributing mechanism is the "hole mechanism.

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The traditional method of the approximating hamiltonian is applied for the investigation of a model of a superconductor with interaction of the BCS type and Coulomb-like repulsion, the latter being described by unbounded operators. It is shown that the traditional method can be generalized in such a