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

We report on the electron spin resonance (ESR) of Eu2+ in EuT2P2 (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 TN, indicating the growing importance of magnetic correlations and the buildup of internal magnetic fields. For T=Mn an additional temperature scale of ≈ 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.