Oxygen content of La1−xSrxMnO3−y thin films and its relation to electric-magnetic properties
Oxygen content of La1−xSrxMnO3−y thin films and its relation to electric-magnetic properties
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DOI：
10.1063/1.2176323
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发表时间：
2006-04
影响因子：
3.2
通讯作者：
J. Sakai;N. Ito;S. Imai
中科院分区：
文献类型：
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作者：
J. Sakai;N. Ito;S. Imai
众所周知，典型双交换材料 La1−xSrxMnO3−y (LSMO) 的电学和磁学性质受到氧非化学计量 y 以及二价离子掺杂水平 x 的强烈影响。在本研究中，我们在不同氧环境 pO2 压力下在 SrTiO3 (STO) (001) 和 LaAlO3 (LAO) (001) 上制备了 LSMO (x=0.4) 薄膜，并使用非卢瑟福弹性共振光谱评估了它们的氧含量 3−y。还测量并讨论了它们的电学和磁学性质的变化。结果表明，氧含量 3−y 并不随着 pO2 的增加而单调增加。 STO 上薄膜的居里温度 TC 和绝缘体-金属转变温度 TIM 与 3−y 相关。与较低 pO2 的薄膜不同，具有相当高 pO2 的 LAO 上的薄膜表现出铁磁性和金属导电性。铁磁性归因于 c/a 轴比更接近块体的轴比。
It is known that the electric and magnetic properties of typical double-exchange materials La1−xSrxMnO3−y (LSMO) are strongly affected by oxygen nonstoichiometry y, as well as by divalent ion doping level x. In the present study, we fabricated LSMO (x=0.4) thin films on SrTiO3 (STO) (001) and LaAlO3 (LAO) (001) under various pressures of oxygen ambient pO2, and evaluated their oxygen content 3−y using non-Rutherford elastic resonance spectroscopy. The change of their electric and magnetic properties was also measured and discussed. It was revealed that the oxygen content 3−y does not increase monotonically as pO2 increases. Curie temperature TC and insulator-metal transition temperature TIM were correlated with 3−y for the films on STO. The film on LAO of a quite high pO2 showed ferromagnetism and a metallic conductivity, unlike the films of lower pO2’s. The ferromagnetism is attributed to c∕a axis ratio closer to that of the bulk.