期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 70, 期 1, 页码 267-271出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.70.267
关键词
perovskite manganites; charge ordering; impurity effect
Destabilization of the charge-ordered (CO) state in half-doped manganites by chromium (Cr) doping in the: manganese (Mn) sites was investigated. The Cr doping: in the half-doped manganites makes the CO state short-ranged and induces new ferromagnetic metallic (FMM) phase at low temperature. Real space images taken in the CO state by electron microscope clearly show coexistence of the short-ranged CO and FMM states, which is characterized as a microscopic scale phase separation. Furthermore, the CO state in the Cr-doped manganites has a superlattice structure with the incommensurate wave vector q = (1/2 - epsilon )a(o)(*); where epsilon depends on the Cr concentration. These results suggest that the Cr doping suppresses the incommensurate to commensurate structural transition found in the half-doped manganites and produces new FMM phase.
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