| 钙钛矿（La1-yTby)0.67Sr0.33MnO3的磁致伸缩效应 |
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| 引用本文： | 吴 坚,曹庆琪,谷坤明,张世远,都有为.钙钛矿（La1-yTby)0.67Sr0.33MnO3的磁致伸缩效应[J].物理学报,1999,48(13):280-285. |
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| 作者姓名： | 吴 坚 曹庆琪 谷坤明 张世远 都有为 |
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| 作者单位： | (1)河海大学数理系，南京 210098; (2)南京大学物理系，固体微结构物理国家重点实验室，南京 210093 |
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| 基金项目： | 国家攀登计划（纳米材料科学）（批准号：NMS-07）和国家自然科学基金（批准号：19890310（4））资助的课题. |
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| 摘 要： | 采用固相反应烧结法制备了（La1-yTby)0.67Sr0.33MnO3系列样品（y=0,0.05,0.15,0.20,0.25,0.33,0.40,0.50,0.60,1.00).X射线衍射表明，随着y值增大钙钛矿型晶体结构从菱面对称性向正交对称性转变.180K时，μ0H=7T条件下，在y=0.40样品的巨磁电阻可达900％.μ0H=1.7T时，y=0.20样品的室温磁致伸缩为-50×10-6.210K时，y=0.33样品的磁致伸缩可达-130×10-6.
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| 收稿时间： | 1999-06-11 |
Magnetostriction of (La1-yTby)0.67Sr0.33MnO3 Perovskite |
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| Wu Jian,Cao Qing-Qi,Gu Kun-Ming,Zhang Shi-Yuan and Du You-Wei.Magnetostriction of (La1-yTby)0.67Sr0.33MnO3 Perovskite[J].Acta Physica Sinica,1999,48(13):280-285. |
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| Authors: | Wu Jian Cao Qing-Qi Gu Kun-Ming Zhang Shi-Yuan and Du You-Wei |
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| Abstract: | A series of polycrystaline bulk samples of (La1-yTby)0.67Sr0.33MnO3(y=0,0.05,0.15,0.20,0.25,0.33,0.40,0.50,0.60,1.00) have been prepared by solid-phase reaction sintering. X-ray diffraction patterns show that the rhombohedral structure has been transfered into orthorhombic structure with increasing Tb content y. For the sample with y=0.40, a colossal magnetoresistance up to 900% has been observed at 180K. When μ0H=1.7T, the anisotropic magnetostriction (λt) of -50×10-6 and volume magnetostriction (ω) -130×10-6 have been observed for the samples of y=0.20 at room temperature, and y=0.33 at 210K respectively. |
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