| 双层钙钛矿锰氧化物La_(1.34)Sr_(1.66)Mn_(2-x)Cr_xO_7的磁性和输运性质 |
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| 引用本文： | 宗云,赵旭,陈伟.双层钙钛矿锰氧化物La_(1.34)Sr_(1.66)Mn_(2-x)Cr_xO_7的磁性和输运性质[J].河北师范大学学报(自然科学版),2009,33(2). |
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| 作者姓名： | 宗云 赵旭 陈伟 |
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| 作者单位： | 1. 河北师范大学物用科学与信息工程学院,河北石家庄050016;石家庄信息工程职业学院计算机系,河北石家庄050035;河北省新型薄膜材料实验室,河北石家庄050016
2. 河北师范大学物用科学与信息工程学院,河北石家庄050016;河北省新型薄膜材料实验室,河北石家庄050016 |
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| 摘 要： | 采用固相反应法制备了双层钙钛矿结构锰氧化物La1.34Sr1366Mn2-xCrCrxO7(x=0,0.1,0.2,0.3.0.4)多晶系列样品,XRD分析表明,所有样品均为Sr3Ti2O7型四方结构,空间群为14/mmm.随着Cr3+离子掺杂浓度的增加,该系列样品的晶胞体积单凋减小.对于少量Cr3+离子掺杂的样品(x=0.1),三维长程铁磁有序转变温度Tc3D升高,二维短程铁磁有序转变温度Tc2D降低;结构分析表明,x=0.1样品的晶格常数c最小,a最大,c/a达到极小值;样品中严重的品格畸变导致双交换作用强度的改变是其磁有序转变温度变化的主要原因.对于大量Cr3+离子掺杂的样品(x=0.3,0.4),Tc3D降低,Tc2D基本保持不变.样品在150～300K范围内电阻率随着温度的降低单凋增加,显示出绝缘体或半导体行为,并且随着Cr离子的掺杂电阻率单调增加.
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| 关 键 词： | 固相反应法 双层钙钛矿锰氧化物 磁特性 |
Magnetic and Transport Properties in Two-layered Perovskite Manganites La_(1.34)Sr_(1.66)Mn_(2-x)Cr_xO_7 |
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| ZONG Yun,ZHAO Xu,CHEN Wei.Magnetic and Transport Properties in Two-layered Perovskite Manganites La_(1.34)Sr_(1.66)Mn_(2-x)Cr_xO_7[J].Journal of Hebei Normal University,2009,33(2). |
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| Authors: | ZONG Yun ZHAO Xu CHEN Wei |
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| Institution: | 1.College of Physics Science and Information Engineering;Hebei Normal University;Hebei Shijiazhuang 050016;China;2.Department of Computer Science;Shijiazhuang Information Engineering Vocational College;Hebei Shijiazhuang 050035;3.Hebei Advanced Thin Films Laboratory;China |
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| Abstract: | The two-layered perovskite manganites La1.34Sr1.66Mn2-xCrxO7(x=0,0.1,0.3,0.4) were prepared by a standard solid-state reaction method.The XRD patterns indicate that all samples can be indexed to a tetragonal Sr3Ti2O7 type sturcture with a space group I4/mmm.The cell volume V of the samples decreases monotonically with increasing Cr3+ ion concentration.For lightly Cr3+ doped sample(x=0.1),the three-dimensional long-range ordering ferromagnetic transition temperature T3Dc increases,while the two-dimensional s... |
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| Keywords: | solid-state reaction two-layered perovskite manganites magnetic properties |
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