Anisotropic properties of the single crystal Pb2Sr2Ho0.5Ca0.5Cu3O 8 have been investigated by measuring the electrical resistivity in the ab-plane ρab(H, θ, T), which depends on the angle θ between the ab-plane and the magnetic-field direction, in various constant fields H perpendicular to the current direction. All the angle-dependent values of ρab(H, θ, T) at a constant temperature are scaled to be on one curve as a function of reduced field. The anisotropic parameter γ≡(mc*/mab*)1/2 is estimated as 12-13, which is larger than that of YBa2Cu3O7 and much smaller than that of Bi2Sr2CaCu2O8. It has been concluded that the anisotropy does not always depend on the thickness of the blocking layer but seems to depend on the overlap of the electronic wave functions along the c-axis. Anisotropy in the pinning potential has also been discussed from the resistive tail in the temperature dependence ρab(H, θ, T).
- High-T superconductivity
- Single crystal
- Upper critical magnetic field