| Anomalous magnetostrictive effects in （La1—xTbx）2／3Sr1／3 MnO3 |
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| 引用本文： | 吴坚,张世远.Anomalous magnetostrictive effects in （La1—xTbx）2／3Sr1／3 MnO3[J].中国物理 B,2003,12(7):792-795. |
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| 作者姓名： | 吴坚 张世远 |
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| 作者单位： | National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China; Department of Mathematics and Physics, Hehai University, Nanjing 210098, China;National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China |
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| 基金项目： | Project supported by the National Key Project for Basic Research (Grant No G1999064508) and the Natural Science Foundation of China (Grant No 19890310(4)). |
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| 摘 要： | A series of (La_{1-x}Tb_x)_{2/3}Sr_{1/3}MnO_3 polycrystalline samples has been studied by means of x-ray diffraction, magnetostriction, and thermal expansion measurements. It has been found that this series undergoes a phase transition from a rhombohedral to an orthorhombic form at the doping level x≈0.20 at room temperature accompanied by an anisotropic magnetostriction up to －50×10^{-6} under a magnetic field of 1T. The linear and volume magnetostrictions vary with chemical composition, even change sign. At T=80K, the magnetostrictions for the samples of x=0.20 and 0.40 exhibit different behaviours. The sample of x=0.20 has positive volume and linear magnetostrictions and a negative anisotropic magnetostriction, while the sample of x=0.40 has an opposite behaviour. The magnitude of volume magnetostriction for both the samples is essential (～10^{-4}) at T=80K under a magnetic field of 4T. We conclude that these anomalous effects are due to the charge delocalization and the structural phase transition between orthorhombic and rhombohedral forms induced by the applied magnetic field.
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| 关 键 词： | 磁致伸缩效应 相变 （Lal－xTbx）2／3Srl／3MnO3 磁性材料 X射线衍射 镧铽锶锰氧化物 |
| 收稿时间： | 2002-11-06 |
Anomalous magnetostrictive effects in (La1-xTbx)2/3S1/3MnO3 |
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| Wu Jian and Zhang Shi-Yuan.Anomalous magnetostrictive effects in (La1-xTbx)2/3S1/3MnO3[J].Chinese Physics B,2003,12(7):792-795. |
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| Authors: | Wu Jian and Zhang Shi-Yuan |
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| Institution: | National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China; National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China; Department of Mathematics and Physics, Hehai University, Nanjing 210098, China |
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| Abstract: | A series of (La_{1-x}Tb_x)_{2/3}Sr_{1/3}MnO_3 polycrystalline samples has been studied by means of x-ray diffraction, magnetostriction, and thermal expansion measurements. It has been found that this series undergoes a phase transition from a rhombohedral to an orthorhombic form at the doping level x≈0.20 at room temperature accompanied by an anisotropic magnetostriction up to －50×10^{-6} under a magnetic field of 1T. The linear and volume magnetostrictions vary with chemical composition, even change sign. At T=80K, the magnetostrictions for the samples of x=0.20 and 0.40 exhibit different behaviours. The sample of x=0.20 has positive volume and linear magnetostrictions and a negative anisotropic magnetostriction, while the sample of x=0.40 has an opposite behaviour. The magnitude of volume magnetostriction for both the samples is essential (～10^{-4}) at T=80K under a magnetic field of 4T. We conclude that these anomalous effects are due to the charge delocalization and the structural phase transition between orthorhombic and rhombohedral forms induced by the applied magnetic field. |
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| Keywords: | magnetostriction phase transition |
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