# Spin-orbital glass transition in a model of a frustrated pyrochlore magnet without quenched disorder

## TL;DR

This paper theoretically demonstrates that in a quenched-disorder-free pyrochlore magnet, spin and orbital degrees of freedom can undergo a simultaneous glass transition driven by their mutual interplay and Jahn-Teller distortions.

## Contribution

It introduces a model showing disorder-free spin glass behavior arising from spin-orbital interactions mediated by lattice distortions.

## Key findings

- Power-law divergence of relaxation times observed
- Negative divergence of magnetic and dielectric susceptibilities
- Simultaneous spin and orbital glass transition detected

## Abstract

We show theoretically that spin and orbital degrees of freedom in the pyrochlore oxide Y2Mo2O7, which is free of quenched disorder, can exhibit a simultaneous glass transition, working as dynamical randomness to each other. The interplay of spins and orbitals is mediated by the Jahn-Teller lattice distortion that selects the choice of orbitals, which then generates variant spin exchange interactions ranging from ferromagnetic to antiferromagnetic ones. Our Monte Carlo simulations detect the power-law divergence of the relaxation times and the negative divergence of both the magnetic and dielectric non-linear susceptibilities, resolving the long-standing puzzle on the origin of the disorder-free spin glass.