Pressure dependence of [ital T][sub [ital c]] and the van Hove scenario of high-[ital T][sub [ital c]] superconductivity

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.15312· OSTI ID:6569217

Horbach, M L ^[1]

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1. Institute-Lorentz for Theoretical Physics, University of Leiden, P.O. Box 9506, 2300 RA Leiden (Netherlands)

The critical temperature of high-[ital T][sub [ital c]] superconductors changes under the application of high pressure. We discuss, within the van Hove scenario of high-[ital T][sub [ital c]] superconductivity, the effect of pressure on [ital T][sub [ital c]]. In this scenario a maximum [ital T][sub [ital c]] is achieved when the Fermi energy coincides with the van Hove singularity in the density of states. The application of pressure is assumed to have two major effects: First it changes the interatomic distances and thus the transfer integrals, having an effect on the density of states. Second, pressure application causes a redistribution of charge carriers, thereby increasing the number of holes in the CuO planes, which causes a change of the Fermi energy. The latter effect turns out to be the most important in order to explain the existence of a maximum, while the former influences [ital dT][sub [ital c]]/[ital dP] at both sides of the maximum, leading to an asymmetric [ital T][sub [ital c]]([ital P]), as observed experimentally.

• OSTI ID: 6569217
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:22; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON TRANSFER
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
HOLES
PHYSICAL PROPERTIES
PRESSURE EFFECTS
SINGULARITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE