Evolution in the split-peak structure across the Peak Effect region in single crystals of $2H$-NbSe$_2$

TL;DR

This study investigates the evolution of a two-peak structure in the peak effect region of $2H$-NbSe$_2$ single crystals, revealing how it develops into a separate second magnetization peak with increased pinning.

Contribution

It provides new insights into the evolution of the split-peak structure across the peak effect region in $2H$-NbSe$_2$ crystals, linking it to pinning effects.

Findings

Two-peak feature observed in ac susceptibility and magnetization data.

The two-peak structure evolves into a distinct second magnetization peak.

Reentrant characteristic in the peak effect curve near $T_c$.

Abstract

We have explored the presence of a two-peak feature spanning the peak effect (PE) region in the ac susceptibility data and the magnetization hysteresis measurements over a wide field-temperature regime in few weakly pinned single crystals of $2H$-NbSe$_2$, which display reentrant characteristic in the PE curve near $T_c$(0). We believe that the two-peak feature evolves into distinct second magnetization peak anomaly well separated from the PE with gradual enhancement in the quenched random pinning.