Disorder correlations at smeared phase transitions

TL;DR

This paper explores how spatial disorder correlations significantly impact smeared quantum phase transitions, contrasting with traditional critical phenomena, and develops a theory supported by simulations and experimental discussion.

Contribution

It introduces an optimal fluctuation theory for quantum phase transitions with correlated disorder, highlighting the importance of short-range correlations.

Findings

Short-range disorder correlations can drastically alter observable behavior.

The developed theory is supported by computer simulations.

Application to ferromagnetic quantum phase transition in Sr$_{1-x}$Ca$_x$RuO$_3$.

Abstract

We investigate the influence of spatial disorder correlations on smeared phase transitions, taking the quantum phase transition in itinerant magnets as an example. We find that even short-range correlations can have a dramatic effect and qualitatively change the behavior of observable quantities. This is in marked contrast to conventional critical phenomena, at which short-range disorder correlations are irrelevant. We develop an optimal fluctuation theory of the quantum phase transition in the presence of correlated disorder, and we illustrate the results by computer simulations. As an experimental application, we discuss the ferromagnetic quantum phase transition in Sr$_{1-x}$Ca$_x$RuO$_3$.