Magnetic properties and electron spin resonance of charge ordering manganite Y <inf>0.5</inf>Ca <inf>0.5</inf>MnO <inf>3</inf>

Abstract

We report the magnetization and electron spin resonance study on charge-ordering (CO) manganite Y 0.5Ca 0.5MnO 3 (YCMO) across the charge-ordering transition temperature T CO down to the antiferromagnetic ordering transition temperature T N. The transition temperatures of T CO and T N are observed at 275 and 125 K, respectively. The observed large decrease in the linewidth from T N to T CO can be explained in terms of motional narrowing caused by the hopping of the Jahn-Teller (JT) polarons. Below T CO the g-value is almost constant, suggesting the weakening of orbital order in the compound of YCMO. © 2004 Elsevier B.V. All rights reserved.