Spin freezing and Field induced transition in (Tb1-xEux)2Ti2O7 : A Magnetic Property study

TL;DR

This study investigates the structural, magnetic, and Raman properties of (Tb1-xEux)2Ti2O7, revealing Eu substitution effects, phonon interactions, spin freezing at 33K, and a field-induced transition related to single moment saturation.

Contribution

It provides new insights into Eu substitution effects, spin freezing phenomena, and field-induced magnetic transitions in (Tb1-xEux)2Ti2O7.

Findings

Eu substitutes Tb in the compound.

A spin freezing occurs at ~33K at zero field.

Field-induced transition shifts with Eu content.

Abstract

The structural, magnetic and Raman effect have been investigated on (Tb1-xEux)2Ti2O7. From structural study it is clear that Eu substitutes the Tb in Tb2Ti2O7. Raman effect study indicates the existence of hardening due to phonon-phonon anharmonic interaction. From dc-magnetic measurement it is observed that in Eu rich samples contribution of dipolar interaction is significant. From ac magnetic measurement of (Tb1-xEux)2Ti2O7 a new single ion weak spin freezing ~ 33K at zero magnetic field is observed. On applying a field of 1T, all the compounds show a field induced transition (T*) which shifts towards higher temperature with increase of Eu content. This field induced transition corresponds to single moment saturation.