Appearance of spontaneous macroscopic magnetization at the superconducting transition of YBCO

R. Carmi, E. Polturak, G. Koren +1

We report the observation of a weak spontaneous magnetic field appearing at the transition temperature of $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{7-\delta }$ into the superconducting state. The effect is obser…