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首页> 外文期刊>Physica, B. Condensed Matter >Crystal growth and basic thermodynamic properties of NdFe2Si2
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Crystal growth and basic thermodynamic properties of NdFe2Si2

机译：NdFe2Si2的晶体生长和基本热力学性质

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摘要

We have grown a single crystal of NdFe2Si2, characterized it by X-ray diffraction and microprobe analysis, and studied the basic thermodynamic properties by means of specific-heat and magnetization (magnetic susceptibility) measurements with respect to temperature and magnetic field. In the light of the obtained results, we consider NdFe2S2 as an antiferromagnet below T-N (13.7 K), which undergoes an additional first-order magnetic phase transition at 13.1 K. The compound exhibits considerable magnetocrystalline anisotropy with easy magnetization direction along the c-axis. When a magnetic field is applied along this direction at 2 K, a sharp metamagnetic transition (NIT) is observed at 1 T, which leads to a state characterized by a magnetic moment of 3mu(B)/f.u. being somewhat lower than the Nd3+ freeion value of ordered moment (3.2mu(B)). This, together with pronounced anisotropic deviations of the temperature dependence of the magnetic susceptibility from the expected Curie Weiss behavior, indicates influence of the crystalline electric field on the Nd orbitals. This conclusion is corroborated by the observed Schottky contribution to the specific heat, from which an energy-level scheme for the Nd3+ ion in NdFe2Si2 has been derived. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 8]
机译：我们已经生长了NdFe2Si2单晶，通过X射线衍射和微探针分析对其进行了表征，并通过比热和磁化（磁化率）测量方法研究了有关温度和磁场的基本热力学性质。根据获得的结果，我们认为NdFe2S2是低于TN（13.7 K）的反铁磁体，它在13.1 K处经历附加的一阶磁相变。该化合物表现出相当大的磁晶各向异性，并且沿c轴的磁化方向很容易。当沿该方向在2 K处施加磁场时，在1 T处会观察到尖锐的亚磁跃迁（NIT），从而导致磁矩为3mu（B）/f.u的状态。略低于有序矩的Nd3 +释放值（3.2mu（B））。这与磁化率对温度的依赖性与预期的居里·魏斯行为的明显各向异性偏差一起，表明了晶体电场对Nd轨道的影响。肖特基对比热的贡献证实了这一结论，由此得出了NdFe2Si2中Nd3 +离子的能级方案。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：8]

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