# Model C critical dynamics of random anisotropy magnets

## TL;DR

This paper investigates the critical dynamics of three-dimensional random anisotropy magnets, revealing complex non-asymptotic behaviors and providing quantitative estimates for critical exponents through advanced field-theoretical analysis.

## Contribution

It offers a detailed two-loop renormalization group analysis of non-asymptotic critical dynamics in random anisotropy magnets, highlighting effects of structural disorder.

## Key findings

- Asymptotic critical properties match the random-site Ising model.
- Structural disorder significantly affects non-asymptotic critical dynamics.
- Complex scenarios are predicted for the effective critical exponent approaching the asymptotic regime.

## Abstract

We study the relaxational critical dynamics of the three-dimensional random anisotropy magnets with the non-conserved n-component order parameter coupled to a conserved scalar density. In the random anisotropy magnets the structural disorder is present in a form of local quenched anisotropy axes of random orientation. When the anisotropy axes are randomly distributed along the edges of the n-dimensional hypercube, asymptotical dynamical critical properties coincide with those of the random-site Ising model. However structural disorder gives rise to considerable effects for non-asymptotic critical dynamics. We investigate this phenomenon by a field-theoretical renormalization group analysis in the two-loop order. We study critical slowing down and obtain quantitative estimates for the effective and asymptotic critical exponents of the order parameter and scalar density. The results predict complex scenarios for the effective critical exponent approaching an asymptotic regime.