Structure-property relationship in the ordered-perovskite-related oxide Sr3.12Er0.88Co4O10.5
Structure-property relationship in the ordered-perovskite-related oxide Sr3.12Er0.88Co4O10.5
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DOI：
10.1103/physrevb.75.220406
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发表时间：
2007-06-01
影响因子：
3.7
通讯作者：
Takata, Masaki
中科院分区：
文献类型：
--
作者：
Ishiwata, Shintaro;Kobayashi, Wataru;Takata, Masaki
对常温铁磁体Sr3.12Er0.88Co4O10.5多晶样品在300 ~ 650 K范围内的同步加速器x射线衍射图进行了测量和分析，发现两个结构相变先后发生。509 K时的高温转变是由氧空位的排序驱动的，这与高温下的金属态密切相关。在360 K时的低温转变是一级的，此时铁磁态突然出现，磁化率和电阻率都出现跳跃。在此基础上，提出了磁序可能的自旋和轨道模型。
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 exhibiting a jump in magnetization and resistivity. Based on the refined structure, possible spin and orbital models for the magnetic order are proposed.