Phase transition in a super superspin glass

TL;DR

This study confirms a spin glass phase transition in a dense maghemite nanoparticle system, estimating critical exponents and demonstrating archetypal spin glass behavior at around 140 K.

Contribution

It provides experimental evidence and critical exponent estimates for the spin glass transition in a highly monodisperse nanoparticle system, advancing understanding of such phase transitions.

Findings

Confirmed spin glass phase transition at ~140 K

Estimated critical exponents of the transition

Demonstrated archetypal spin glass behavior

Abstract

We here confirm the occurrence of spin glass phase transition and extract estimates of associated critical exponents of a highly monodisperse and densely compacted system of bare maghemite nanoparticles. This system has earlier been found to behave like an archetypal spin glass, with e.g. a sharp transition from paramagnetic to non-equilibrium behavior, suggesting that this system undergoes a spin-glass phase transition at a relatively high temperature, $T_g$ $\sim$ 140 K.