Magnetic and Electron Spin Resonance Properties of BaxSr2–xTiCoO6 Double Perovskites

Abstract

Herein, the magnetic behavior of BaxSr2–xTiCoO6 (BSTC) double perovskites synthesized by the conventional solid-state reaction route is investigated. To understand the complexity of B-site cations and their distribution in different valance states, X-ray photoelectron spectroscopy (XPS) is performed. To understand the magnetic interactions at lower temperatures, variation of magnetization in both zero-field-cooled and field-cooled conditions is studied in the temperature range from 2 to 300 K. Temperature dependence of inverse susceptibility is explained by modified Curie–Weiss law. Weak ferromagnetic and antiferromagnetic interactions are found in BSTC compounds, causing the randomness and frustrations and leading to a spin-glass-like behavior. To gain further insights, electron spin resonance (ESR) measurements are also carried out in BSTC ceramics. ESR measurement suggests the occurrence of Jahn–Teller glass analogous to the spin-glass behavior in BSTC ceramics. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim