Observation of magnetization reversal and negative magnetization in a double perovskite compound Sr2YbRuO6

TL;DR

This study investigates the magnetic properties of Sr2YbRuO6, revealing magnetization reversal, negative magnetization, and complex magnetic behavior due to multiple ordering components and crystal field effects.

Contribution

It provides detailed experimental evidence of magnetization reversal and negative magnetization in Sr2YbRuO6, with analysis of underlying magnetic interactions and anomalies.

Findings

Magnetization reversal observed at T* = 34 K

Negative magnetization at low temperatures and fields

Presence of multiple magnetic ordering components

Abstract

Detailed magnetic properties of the compound Sr2YbRuO6 are presented here. The compound belongs to the family of double perovskites forming a monoclinic structure. Magnetization meas-urements reveal clear evidence for two components of magnetic ordering aligned opposite to each other, leading to a magnetization reversal, compensation temperature (T* = 34 K) and neg-ative magnetization at low temperatures and low magnetic fields. Heat capacity measurements corroborate the presence of two components in the magnetic ordering and a noticeable third anomaly at low temperatures (~15 K) which cannot be attributed the Schottky effect. The calcu-lated magnetic entropy is substantially lower than that expected for the ground states of the or-dered moments of Ru5+ and Yb3+, indicating the presence of large crystal field effects and/ or in-complete magnetic ordering and/or magnetic frustrations well above the magnetic ordering. An attempt is made to explain the magnetization reversal within the frameworks of available models.