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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Magnetic behavior of LaCo-(13-x)Si_x in the vicinity of the critical concentration x = 4
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Magnetic behavior of LaCo-(13-x)Si_x in the vicinity of the critical concentration x = 4

机译：LaCo-（13-x）Si_x在临界浓度x = 4附近的磁行为

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摘要

Magnetic, specific heat and transport studies on the solid solution LaCo_(13-x)Si_x (x = 3.8, 3.9, 4.0, 4.1, and 4.5) imply the existence of a critical composition x_(crit) = 4 for the onset of magnetism. For alloys on the Co-rich side (x < 4) magnetic susceptibility measurements reveal weak ferromagnetism with a decrease of T_C with increasing x. These magnetic phase transitions are also seen in the electrical resistivity and specific heat measurements. At the stoichiometric composition with x = 4, namely for LaCo_9Si_4, we observe full structural order within the space group I4/mcm, but magnetic order appears to be absent. LaCo_9Si_4 shows spin fluctuation behavior, which persists on the silicon-rich side x > 4. Resistivity, susceptibility and specific heat measurements on LaCo_9Si_4 provide strong indication for the presence of spin fluctuations with a T~2 temperature dependence of the electrical resistivity, an enhanced low temperature Pauli susceptibility chi_0~(LT) approx= 47 X 10~(-3) emu/mol at 2K and a large Sommerfeld value gamma = 200 mJ/(mol K~2).
机译：对固溶体LaCo_（13-x）Si_x（x = 3.8、3.9、4.0、4.1和4.5）的磁性，比热和输运研究表明，对于磁性的开始存在关键成分x_（crit）= 4 。对于富钴侧的合金（x <4），磁化率测量显示铁磁性弱，随着x的增加T_C降低。在电阻率和比热测量中也可以看到这些磁性相变。在x = 4的化学计量组成下，即对于LaCo_9Si_4，我们观察到空间群I4 / mcm内的完整结构有序，但似乎没有磁序。 LaCo_9Si_4表现出自旋波动行为，该行为在富硅侧x> 4上持续存在。LaCo_9Si_4的电阻率，磁化率和比热测量提供了自旋波动的存在的强烈指示，电阻率的T〜2温度依赖性，增强了低温Pauli磁化率chi_0〜（LT）在2K时约为47 X 10〜（-3）emu / mol，大的Sommerfeld值gamma = 200 mJ /（mol K〜2）。

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