The Low-Temperature Macroscopic Phase Separation in La0.5Ba0.5CoO3-delta Cobaltite

resumo

La0.5Ba0.5CoO2.87 has been characterized with neutron and synchrotron powder diffraction and magnetization measurements. This compound was shown to have a cubic crystal structure at temperatures above 200 K whereas slightly above the Curie point T-c similar to 170 K the structural separation into two different pseudocubic phases gradually develops upon cooling. The structural transformation is reversible. At 2 K the sample consists of G-type antiferromagnetic oxygen-poor and ferromagnetic oxygen-rich phases (approximately 33 and 66%, respectively).

palavras-chave

COEXISTENCE; PEROVSKITE; STATES

categoria

Physics

autores

Troyanchuk, IO; Karpinsky, DV; Bushinsky, MV; Sikolenko, V; Efimov, V; Cervellino, A

Grupos

agradecimentos

This work was supported by Belarussian Fund for Fundamental Research (grant no. F09F-003).

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