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25 January 2025

» arxiv » cond-mat/0701244

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Effect of oxygen isotope substitution and crystal micro-structure on magnetic ordering and phase separation in {$ m (La_{1-y}Pr_{y})_{0.7}Ca_{0.3}MnO_3$}
V. Yu. Pomjakushin ; D. V. Sheptyakov ; K. Conder ; E. V. Pomjakushina ; A. M. Balagurov ;
Date:	11 Jan 2007
Subject:	Strongly Correlated Electrons
Abstract:	The crystal and magnetic structures of the specified CMR manganite system have been studied as a function of $y=(0.2-1)$ across the metal-insulator (MI) transition, and of the oxygen mass ($^{16}$O, $^{18}$O). We quantitatively show how the polaronic narrowing of the carrier bandwidth and the crystal lattice micro-strains control the volume fractions of the mesoscopic ferro- and antiferromagnetic clusters. A well-defined dip in the transition temperatures and the suppression of all the types of long range ordering seen near the MI-transition at $ysimeq0.9$ indicate a key role of the quenched disorder for the formation of the long-scale phase separated state.
Source:	arXiv, cond-mat/0701244
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