Eu$_{0.5}$Sr$_{1.5}$MnO$_4$: a three-dimensional XY spin glass

TL;DR

This study investigates the ac-susceptibility of Eu$_{0.5}$Sr$_{1.5}$MnO$_4$, revealing a three-dimensional XY spin glass transition at 18 K with critical exponents near Ising-like behavior and weak rejuvenation effects.

Contribution

The paper provides the first detailed analysis of the XY spin glass behavior in Eu$_{0.5}$Sr$_{1.5}$MnO$_4$, highlighting its unique critical properties and dynamical features.

Findings

Identifies a 3D XY spin glass transition at 18 K.

Critical exponents are between Heisenberg and Ising values.

Weak rejuvenation effects similar to Ising spin glasses.

Abstract

The frequency, temperature, and dc-bias dependence of the ac-susceptibility of a high quality single crystal of the Eu$_{0.5}$Sr$_{1.5}$MnO$_4$ layered manganite is investigated. Eu$_{0.5}$Sr$_{1.5}$MnO$_4$ behaves like a XY spin glass with a strong basal anisotropy. Dynamical and static scalings reveal a three-dimensional phase transition near $T_g$ = 18 K, and yield critical exponent values between those of Heisenberg- and Ising-like systems, albeit slightly closer to the Ising case. Interestingly, as in the latter system, the here observed rejuvenation effects are rather weak. The origin and nature of the low temperature XY spin glass state is discussed.