Effect of applied voltage on oscillatory current with hot spot in SmBa2Cu3O7-d ceramic rod

Abstract

A hot spot appeared in SmBa₂Cu₃O_7-δ ceramic rod when voltage above a threshold was applied in room temperature. Under low oxygen partial pressure, a damped sinusoidal oscillatory current was generated after the appearance of the hot spot. In this work, the effect of applied voltage on the oscillatory current was investigated. The decay of the amplitude decreased with increasing voltage. The decay of the amplitude was considered to be related to the size of the hot spot.