నైరూప్య

Vortex lattice melting and irreversibility temperatures in YBa2Cu3O7

S.B.Ota

The dc I-V characteristic of polycrystalline YBa2Cu3O7-X high temperature superconductors (HTSC) is measured near the transition temperature (Tc). A difference in voltage was found for forward and reverse current directions near Tc. The measured dc voltage showed increased noise near Tc which is related to flicker 1/f noise. The experimental results are explained in terms of melting of the vortex lattice and irreversibility temperature which is observed near the superconducting transition in YBa2Cu3O7-x.