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Influence of hydrogenation on the structural and magnetic properties of compounds based on cerium and crystallizing in the tetragonal CeFeSi-type structure

机译:氢化对铈基化合物和四方CeFeSi型结构结晶的结构和磁性的影响

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The hydrogen absorption properties of CeMnGe, CeFeSi and CeCoX (X=Si and Ge) have been investigated. Neutron powder diffraction performed on deuteride CeCoGeD indicates that D-atoms are inserted in the pseudo-tetrahedral interstices [Ce-4] of the tetragonal CeFeSi-type structure of this compound. Magnetization and electrical resistivity measurements reveal that the hydrogenation of: (i) CeCoSi and CeCoGe leads to the transition antiferromagnet -> spin fluctuation behaviour; (ii) CeMnGe suppress the magnetic ordering of the Ce-moments. These results which suggest a lost of ordered magnetic moment on the Ce site after hydrogenation could result from the chemical effect of hydrogen which prevails over the unit cell expansion effect. (c) 2005 Elsevier Ltd. All rights reserved.
机译:研究了CeMnGe,CeFeSi和CeCoX(X = Si和Ge)的氢吸收性能。在氘代CeCoGeD上进行的中子粉末衍射表明,D原子插入了该化合物四方CeFeSi型结构的拟四面体空隙[Ce-4]中。磁化和电阻率测量显示:(i)CeCoSi和CeCoGe的氢化导致过渡反铁磁体->自旋涨落行为; (ii)CeMnGe抑制了Ce矩的磁有序性。这些结果表明,氢化后在Ce位置上失去有序的磁矩可能是由氢的化学作用引起的,该氢的化学作用优于晶胞膨胀作用。 (c)2005 Elsevier Ltd.保留所有权利。

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