Electron Spin Resonance of Eu on triangular layers in EuT2P2 (T =Mn, Zn, Cd)

TL;DR

This study investigates the electron spin resonance of Eu$^{2+}$ in EuT$_{2}$P$_{2}$ single crystals, revealing magnetic correlations and an additional temperature scale related to Mn magnetic interactions.

Contribution

First ESR analysis of EuT$_{2}$P$_{2}$ compounds showing magnetic correlations and a new temperature scale in EuMn$_{2}$P$_{2}$.

Findings

ESR linewidth and shift diverge near Eu magnetic ordering temperature.

An additional temperature scale at ~47 K affects ESR properties in EuMn$_{2}$P$_{2}$.

Evidence of previously unreported Mn magnetic correlations.

Abstract

We report on the electron spin resonance (ESR) of Eu$^{2+}$ in Eu$T_{2}$P$_{2}$ ($T$=Mn, Zn, Cd) single crystals. The temperature dependencies of ESR linewidth and resonance shift show a similar behaviour when approaching the Eu-ordered state -- a divergence towards $T_{\rm N}$, indicating the growing importance of magnetic correlations and the build-up of internal magnetic fields. For $T$=Mn an additional temperature scale of $\approx 47$~K has considerable impact on linewidth, resonance field and intensity. This points to the presence of Mn magnetic correlations which yet were not reported.