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Properties of the gap energy in the van Hove scenario of high-temperature superconductivity

Properties of the gap energy in the van Hove scenario of high-temperature superconductivity An exact transition-temperature ( T c ) formula is derived within the van Hove scenario of BCS phonon-mediated pairing theory consisting of a logarithmic singularity in the density of states (DOS) at the Fermi energy. Also evaluated are a near-exact zero-temperature gap-energy expression along with an exact (numerical) temperature-dependent gap energy. Though T c is greatly enhanced over the conventional BCS (constant DOS) value for given (weak) coupling, the zero-temperature gap-to- T c ratio and the temperature-dependent gap energy both differ little from the BCS values. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Properties of the gap energy in the van Hove scenario of high-temperature superconductivity

Getino, J. M; de Llano, M. M; Rubio, H. M
Physical Review B , Volume 48 (1) – Jul 1, 1993
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1993 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.48.597
Publisher site
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Abstract

An exact transition-temperature ( T c ) formula is derived within the van Hove scenario of BCS phonon-mediated pairing theory consisting of a logarithmic singularity in the density of states (DOS) at the Fermi energy. Also evaluated are a near-exact zero-temperature gap-energy expression along with an exact (numerical) temperature-dependent gap energy. Though T c is greatly enhanced over the conventional BCS (constant DOS) value for given (weak) coupling, the zero-temperature gap-to- T c ratio and the temperature-dependent gap energy both differ little from the BCS values.

Journal

Physical Review B – American Physical Society (APS)

Published: Jul 1, 1993

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