Critical properties of Bose-glass superconductors

TL;DR

This paper investigates the critical behavior of Bose-glass phases in high-temperature superconductors with columnar defects, proposing new scaling forms and providing Monte Carlo simulation results for critical exponents.

Contribution

It introduces a new scaling form for the Bose glass phase boundary and provides Monte Carlo estimates of critical exponents for vortex models.

Findings

Dynamic critical exponent z = 4.6 +/- 0.3

Proposed a new scaling form for the Bose glass phase boundary

Monte Carlo simulations support the scaling analysis

Abstract

We study vortex lines in high-temperature superconductors with columnar defects produced by heavy ion irradiation. We reconsider scaling theory for the Bose glass transition with tilted magnetic fields, and propose, e.g., a new scaling form for the shape of the Bose glass phase boundary, which is relevant for experiments. We also consider Monte Carlo simulations for a vortex model with a screened interaction. Critical exponents are determined from scaling analysis of Monte Carlo data for current-voltage characteristics and other quantities. The dynamic critical exponent is found to be z = 4.6 +/- 0.3.