文章基本信息

标题：Tuneable Magnetic Phase Transitions in Layered CeMn₂Ge_2-xSi_x Compounds
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作者：M. F. Md Din ; J. L. Wang ; Z. X. Cheng 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep11288
出版社：Springer Nature
摘要：The structural and magnetic properties of seven CeMn₂Ge_2-xSi_x compounds with x = 0.0–2.0 have been investigated in detail. Substitution of Ge with Si leads to a monotonic decrease of both a and c along with concomitant contraction of the unit cell volume and significant modifications of the magnetic states - a crossover from ferromagnetism at room temperature for Ge-rich compounds to antiferromagnetism for Si-rich compounds. The magnetic phase diagram has been constructed over the full range of CeMn₂Ge_2-xSi_x compositions and co-existence of ferromagnetism and antiferromagnetism has been observed in CeMn₂Ge_1.2Si_0.8, CeMn₂Ge_1.0Si_1.0 and CeMn₂Ge_0.8Si_1.2 with novel insight provided by high resolution neutron and X-ray synchrotron radiation studies. CeMn₂Ge_2-xSi_x compounds (x = 0, 0.4 and 0.8) exhibit moderate isothermal magnetic entropy accompanied with a second-order phase transition around room temperature. Analysis of critical behaviour in the vicinity of T_C^inter for CeMn₂Ge₂ compound indicates behaviour consistent with three-dimensional Heisenberg model predictions.