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Application of physical pressure on the cuprate superconductors often results in an enhancement of T c . Motivated by this fact, we study the chemical pressure effect on the single-layered La 2 CuO 4 and HgBa 2 CuO 4 starting from the two-orbital Hubbard model deduced from a first-principles calculation. It is shown that the chemical pressure effects induced...
Our recent study has revealed that the mixture of the d z2 orbital component into the Fermi surface suppresses T c in the cuprates such as La 2 CuO 4 . We have also shown that applying hydrostatic pressure enhances T c due to smaller mixing of the Cu4s component. We call these the “orbital distillation” effect. In our previous study, the 4s orbital was taken...
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