Photomagnetism Studies in Nd0.7Sr0.3CoO3

Abstract

The partial substitution of rare earth ion by bivalent alkaline earth ion in perovskite oxide of the type LnMO₃ (Ln = Rare earth ion, M = Transition metal ion) generates mixed valence states of M³⁺ and M⁴⁺ has been extensively studied. This article investigate the photo magnetic effects in the system, Nd_0.7Sr_0.3CoO₃. This composition is known to exhibit interesting magnetic properties at low temperatures . The results obtained earlier suggest an electronic phase separation due to coexistence of ferromagnetic and antiferromagnetic interaction which competes and causes frustration. Due to the substitution of Sr²⁺ at Neodymium site, Co³⁺ and Co⁴⁺ are generated which can in principle exist in either low, intermediate or high spin states. The intermediate states of Co³⁺ and Co⁴⁺ ion , which are known to exist in these cobaltites are Jahn Teller ion. These ions and Nd³⁺ (L = 6) having large orbital moments may induce a large anisotropy.