Total energy local density determinations of the effects of pressure on the (Sr1-xCax)1-yCuO2 infinite layer (IL) Tc=110 K superconductor show, that the compressibility is highly anisotropic. Surprisingly, the energy location of the van Hove singularity (vHs) moves towards EF with pressure, thereby showing a correspondence between the number of holes (from dopants) needed to shift EF down to the vHs and the pressure needed to be applied to a fixed dopant material to achieve the best Tc. Some consequences for understanding the pressure effects on the Tc of the Hg superconductors and possible experiments are suggested.
ASJC Scopus subject areas
- Condensed Matter Physics