Magnetic phase transitions in Y1−xTbxMn6Sn6, La1−xSmxMn2Si2, Lu2(Fe1−хMnx)17, and La(Fe0.88SixAl0.12−x)13 intermetallic compounds
Magnetic phase transitions in Y1−xTbxMn6Sn6, La1−xSmxMn2Si2, Lu2(Fe1−хMnx)17, and La(Fe0.88SixAl0.12−x)13 intermetallic compounds
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Y1−xTbxMn6Sn6、La1−xSmxMn2Si2、Lu2(Fe1−хMnx)17 和 La(Fe0.88SixAl0.12−x)13 金属间化合物中的磁相变
DOI：
10.1016/j.jmmm.2014.10.048
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发表时间：
2015
影响因子：
2.7
通讯作者：
A. V. Vershinin
中科院分区：
文献类型：
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作者：
N. Mushnikov;A. Kuchin;E. Gerasimov;P. Terent’ev;V. Gaviko;V. V. Serikov;N. Kleinerman;A. V. Vershinin
测量了 Y1−xTbxMn6Sn6、La1−xSmxMn2Si2、Lu2(Fe1−хMnx)17 和 La(Fe0.88SixAl0.12–x)13 系统的磁性，这些系统在改变成分浓度或施加磁场时显示出从反铁磁态到铁磁态的转变。我们确定了磁相变的浓度和温度并绘制了磁相图。在接近临界浓度时，AF-F 转变可以在低磁场中实现，这使得这些化合物对磁热应用具有吸引力。利用磁化强度测量数据，我们确定了宽温度范围内的等温磁熵变。所有研究的系统都具有层状磁结构，具有正的层内交换相互作用和不同符号的层间交换积分，具体取决于成分和温度。对于具有立方晶体结构的化合物La(Fe0.88SixAl0.12−x)13，基于穆斯堡尔研究的数据讨论了层状磁结构形成的起源，该数据揭示了不同磁序化合物中共振原子的局域周围存在差异。
Magnetic properties have been measured for the Y1−xTbxMn6Sn6, La1−xSmxMn2Si2, Lu2(Fe1−хMnx)17, and La(Fe0.88SixAl0.12–x)13systems which show up transitions from antiferromagnetic to ferromagnetic state upon changing concentration of the constituents or application of magnetic field. We determined the concentrations and temperatures of the magnetic phase transitions and plotted magnetic phase diagrams. Near a critical concentration, the AF–F transition can be realized in low magnetic fields, which makes these compounds attractive for magnetothermal applications. Using the data of the magnetization measurement, we determined the isothermal magnetic entropy change in a wide temperature range. All the studied systems have a layered magnetic structure with the positive intralayer exchange interaction and the interlayer exchange integrals of different signs depending on the composition and temperature. For the compounds La(Fe0.88SixAl0.12−x)13with the cubic crystal structure, the origin of formation of a layered magnetic structure is discussed based on the data of Mössbauer studies which revealed a difference in the local surrounding of resonant atoms in the compounds with different magnetic orders.