Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-06-05
Phys. Rev. B 75, 220406(R) (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
to be published in Phys. Rev. B Rapid Communication
Scientific paper
10.1103/PhysRevB.75.220406
Synchrotron X-ray diffraction patterns were measured and analyzed for a polycrystalline sample of the room-temperature ferromagnet Sr3.12Er0.88Co4O10.5 from 300 to 650 K, from which two structural phase transitions were found to occur successively. The higher-temperature transition at 509 K is driven by ordering of the oxygen vacancies, which is closely related to the metallic state at high temperatures. The lower-temperature transition at 360 K is of first order, at which the ferromagnetic state suddenly appears with exhibiting a jump in magnetization and resistivity. Based on the refined structure, possible spin and orbital models for the magnetic order are proposed.
Ishiwata Shintaro
Kato Kenichi
Kobayashi Wataru
Takata Masaki
Terasaki Ichiro
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