銅酸化物超伝導体の一軸圧縮効果

抄録

In this article, uniaxial compression effects on cuprate superconductors such as YBa₂Cu₄O₈ [Y-124], Y_0.98Ca_0.02Ba₂Cu₄O₈ [Y_0.98Ca_0.02-124], and Hg_0.83Re_0.18Ba₂Ca_2.4Cu_3.6O₁₄ [Hg_0.83(Re_0.18)-1223] were reviewed. The uniaxial compression effects were compared with the hydrostatic compression effects via measuring the Meissner signal of their single crystals in the setup of using a diamond anvil cell. In Y-124 and Y_0.98Ca_0.02-124, the disappearance of the Meissner signal depended on the style of compression, and the difference in the change in the superconducting transition temperature T_c against initial compression are discussed with the structural symmetry of the CuO₅ pyramid. In Hg_0.83(Re_0.18)-1223, the mechanism of increasing T_c is discussed on the basis of the first principle calculation.