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We have studied the thermally activated flux creep of a newly fabricated superconductor Y3Ba5Cu8O18 with the superconducting transition temperature 102 K. Analysis of the transition spread from the normal state to superconducting state in the electrical resistivity revealed that the thermally activated flux creep explains the electron share in the vicinity of the transition temperature Tc. The activation energy U in a magnetic field below 15 kOe has been calculated by the corrected thermally activated flux creep model, and the pinning energy is exponentially related to the magnetic field.

In this study we introduce a new analytical expression for the intensity distribution of the diffraction patterns from a twined sample of YBCOx ( YBa2Cu3O6+x, 0

In this paper, the density of states (DOS) of a planar d-wave Josephson junction is studied analytically. Two high temperature superconductors are separated by an interface with finite transparency coefficient. The c-axes are parallel to the interface and ab-axes have a mis-orientation. The tunneling occurs via the interface because of phase difference between superconducting bulks. The effect of reflection at the interface and mis-orientation on the DOS is investigated both analytically and numerically. It is observed that, DOS is totally different from the case of ideal transparent d-wave Josephson junctio. Also, the mid-gap states at the energies -Δ