Pressure dependence of Tc and the van Hove scenario of high-Tc superconductivity
M. L. Horbach
DOI 10.1103/PhysRevB.47.15312 · Physical Review B
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Abstract
The critical temperature of high-Tc superconductors changes under the application of high pressure. We discuss, within the van Hove scenario of high-Tc superconductivity, the effect of pressure on Tc. In this scenario a maximum Tc 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 dTc/dP at both sides of the maximum, leading to an asymmetric Tc(P), as observed experimentally.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | 10 GPa | unknown |
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