Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-10-22
Phys. Rev. B 76, 155112 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 7 figures
Scientific paper
10.1103/PhysRevB.76.155112
Impurity effects on the stability of a ferromagnetic metallic state in a bicritical-state manganite, (La0.7Pr0.3)0.65Ca0.35MnO3, on the verge of metal-insulator transition have been investigated by substituting a variety of transition-metal atoms for Mn ones. Among them, Fe doping exhibits the exceptional ability to dramatically decrease the ferromagnetic transition temperature. Systematic studies on the magnetotransport properties and x-ray diffraction for the Fe-doped crystals have revealed that charge-orbital ordering evolves down to low temperatures, which strongly suppresses the ferromagnetic metallic state. The observed glassy magnetic and transport properties as well as diffuse phase transition can be attributed to the phase-separated state where short-range charge-orbital-ordered clusters are embedded in the ferromagnetic metallic matrix. Such a behavior in the Fe-doped manganites form a marked contrast to the Cr-doping effects on charge-orbital-ordered manganites known as impurity-induced collapse of charge-orbital ordering.
Ito Katsushi
Kumai Reiji
Sakai Hajime
Tokura Yasuhiro
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