| 低掺杂La1-xSrxMnO3结构相变对其电磁特性的影响 |
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| 引用本文： | 张富祥,贺端威,张湘义,许应凡,王文魁.低掺杂La1-xSrxMnO3结构相变对其电磁特性的影响[J].物理学报,1998,47(1):112-116. |
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| 作者姓名： | 张富祥 贺端威 张湘义 许应凡 王文魁 |
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| 作者单位： | (1)中国科学院物理研究所，北京 100080; (2)中国科学院物理研究所，北京 100080;北京理工大学机电工程系，北京 100081 |
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| 摘 要： | 高温高压条件下，低掺杂的La1-xSrxMnO3化合物发生从菱方相(R3c)到立方相的转变，该相变使其从低温时的绝缘态(极化子有序)转变为金属态.同时，随温度的降低，局域锰离子的自旋也从铁磁长程有序变成了只有短程序结构的自旋玻璃态.这种转变是由于相变引起的Mn—O—Mn键角及Mn—O键长的改变所引起.
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| 关 键 词： | 晶体 LaSrMnO 玻璃态 掺杂 结构 相变 |
| 收稿时间： | 1997-05-28 |
EFFECTS OF STRUCTURAL TRANSITION ON THE ELECTRICAL AND MAGNETIC PROPERTIES IN LIGHTLY DOPED La1-xSrxMnO3 PEROVSKITE |
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| ZHANG FU-XIANG,HE DUAN-WEI,ZHANG XIANG-YI,XU YING-FAN and WANG WEN-KUI.EFFECTS OF STRUCTURAL TRANSITION ON THE ELECTRICAL AND MAGNETIC PROPERTIES IN LIGHTLY DOPED La1-xSrxMnO3 PEROVSKITE[J].Acta Physica Sinica,1998,47(1):112-116. |
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| Authors: | ZHANG FU-XIANG HE DUAN-WEI ZHANG XIANG-YI XU YING-FAN and WANG WEN-KUI |
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| Abstract: | A structural transition from rhombohedral to cubic phase occurred in the lightly doped La1-xSrxMnO3 under high temperature and high pressure. The samples changed from an insulated (polaron ordering) state to metallic state after the phase transition. At the same time, the long-range ferromagnetic ordering of the spins of localized Mn ions collapsed into the spin glass state with only short-range ordering when the temperature decreased. The change of properties was due to the variation of Mn—O—Mn bond angle and Mn—O bond length during the structural transition. |
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