Geometry effect on the nonlinear magnetic response of YBa₂Cu₃O_7-y

Abstract

Results are presented for study of nonlinear magnetization of a sintered YBa₂Cu₃O_7-y pellet of different thickness of a sample subjected to very low magnetic field. On cooling the sample below T_c in zero field a change, in the oscillatory structure of harmonics in increasing dc field is observed in very low ac magnetic field. The effect of finiteness of the sample on the oscillatory structure and on the hysteresis of harmonics is also studied. The results are explained qualitatively.