Dynamical Properties of Chiral-Glass Order in Ceramic High-Tc Superconductors

TL;DR

This paper investigates the dynamical critical behavior of the chiral-glass phase in ceramic high-temperature superconductors, using Monte Carlo simulations to analyze phase transition properties related to time-reversal symmetry breaking.

Contribution

It provides a detailed dynamical scaling analysis of the chiral-glass transition in a lattice XY model with finite screening, linking simulations with experimental observations.

Findings

Identification of dynamical critical exponents for the chiral-glass transition

Agreement of simulation results with experimental ac susceptibility data

Insights into the role of frustration and d-wave pairing symmetry

Abstract

There recently accumulated growing numerical and experimental evidence that a novel glassy zero-field phase characterized by the spontaneously broken time-reversal symmetry, a chiral-glass phase, is realized in certain ceramic high-$T_c$ superconductors. Existence of frustration in zero external field, arising from the d-wave pairing symmetry of high-$T_c$ superconductors, is essential to realize this phase. In this paper, we study the dynamical critical properties of the chiral-glass transition by means of Monte Carlo simulations, based on a lattice {\it XY} model with finite screening. We perform a dynamical scaling analysis, and the results are discussed in conjunction with recent ac magnetic susceptibility and transport measurements on high-$T_c$ ceramics.