Simultaneous Observation of Fishtail Effect and Peak Effect in 2H-Nbse2
S. S. Banerjee et al
Abstract
We report on the discovery of the simultaneous observation of Fishtail Effect (FE) and Peak Effect (PE) via the study of angular dependence of dc magnetization hysteresis loops in a clean crystal of 2H-NbSe2. These result clarify and establish the occurrence of the reentrant characteristics in order to disorder transformation in an isothermal scan close to zero field superconducting transition temperature of 2H-NbSe2. The ubiquitous FE arises from coalescence of two anomalous variations in current density Jc, one of which is related to the collapse of the rigidity FLL close to Hc2 and another one located at very low fields presumably corresponds to the pinning induced order to disorder transformation. When the two effects get well separated, an ordered state of FLL exists in the intermediate field region.
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