Collective vortex pinning and crossover between second order to first order transition in optimally doped Ba1-xKxBiO3 single crystals

TL;DR

This study investigates vortex pinning and phase transition crossover in optimally doped Ba1-xKxBiO3 single crystals through magnetization and relaxation measurements, revealing a transition from second to first order vortex phase transition.

Contribution

It provides the first detailed analysis of vortex dynamics and phase transition crossover in Ba1-xKxBiO3, using collective pinning models and relaxation data.

Findings

Vortex pinning follows the collective pinning model with a glassy exponent of about 1.64 to 1.68.

A crossover from second order to first order vortex phase transition is observed.

The vortex phase diagram demonstrates the material as a model for collective vortex pinning studies.

Abstract

Measurements on magnetization and relaxation have been carried out on an optimally doped Ba$_{0.59}$K$_{0.47}$BiO$_{3+\delta}$ single crystal with $T_c$ = 31.3 K. Detailed analysis is undertaken on the data. Both the dynamical relaxation and conventional relaxation have been measured leading to the self-consistent determination of the magnetization relaxation rate. It is found that the data are well described by the collective pinning model leading to the glassy exponent of about $\mu\approx$ 1.64 to 1.68 with the magnetic fields of 1 and 3 T. The analysis based on Maley's method combining with the conventional relaxation data allows us to determine the current dependent activation energy $U$ which yields a $\mu$ value of about 1.23 to 1.29 for the magnetic fields of 1 and 3 T. The second magnetization peaks appear in wide temperature region from 2 K to 24 K. The separation between the second peak field and the irreversibility field becomes narrow when temperature is increased. When the two fields are close to each other, we find that the second peak evolves into a step like transition of magnetization, suggesting a crossover from the second order to first order transition. Finally, we present a vortex phase diagram and demonstrate that the vortex dynamics in Ba$_{1-x}$K$_x$BiO$_3$ can be used as a model system for studying the collective vortex pining.