Neutron inelastic measurements on Y0.52Pr0.48Ba2Cu3O7 have been carried out. From the magnetic excitation spectra X″(q, ω), it is found that the reduction of the hole-carrier concentration p and the randomness effects introduced by the substitution of Y with Pr suppress the superconductivity. Based on the hole-trapping model, the origin of the randomness effects can be explained. The R-ion-size dependence of the suppression rate of the superconducting transition temperature, |dTc/d x|, can also be explained qualitatively. By measuring the Hall coefficients RH of R1-xPrxBa2Cu3O7 (R = Yb, Y, Gd and Sm), |d p /d x| is found to be insensitive to the species of R. For RBa2Cu3O7 (without Pr atoms), p decreases with increasing R-ion-size, which presents another possible explanation of the R-ion-size dependence of |dTc/d x|.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering