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Influence of a Van Hove singularity on the electronic specific heat of high-Tc superconductors

✍ Scribed by S. Dorbolo; M. Houssa; M. Ausloos

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
403 KB
Volume
267
Category
Article
ISSN
0921-4534

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✦ Synopsis

We study the influence of a logarithmic Van Hove singularity on the electronic specific heat C e of a 2D superconductor. The theoretical results are obtained for an isotropic s-wave gap parameter or an anisotropic dx2 y2-wave gap parameter. The specific heat jump at T c observed in high-T c superconductors can be reproduced by considering both gap parameter symmetries. However the very low temperature behavior of Ce as observed in a single crystal of YBa2Cu307_ ~ is only consistent with a gap parameter of dx2_y2 wave type.

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Electronic structure and Fermi surface of the HgBa2CuO4+Ξ΄ superconductor: Apparent importance of the role of van Hove singularities on high Tc
✍ D.L. Novikov; A.J. Freeman πŸ“‚ Article πŸ“… 1993 πŸ› Elsevier Science 🌐 English βš– 724 KB

The electronic structure and Fermi surface of the recently discovered HgBa2CuO4Γ·a superconductor with Tc = 95 K is calculated making use of the full-potential linear muffin-tin orbital (FLMTO) method. Similarly to the other high-To cuprates, the main feature of the electronic structure of undoped Hg