Interplay of negative pressure and hydrogen chemical effects in CeRhSn from first principles

A. F. Al Alam, S. F. Matar (), N. Ouaini and M. Nakhl

The European Physical Journal B: Condensed Matter and Complex Systems, 2008, vol. 65, issue 4, 491-498

Abstract: Investigations within the local spin density functional theory (LSDF) of the intermetallic hydride system CeRhSnH x were carried out for discrete model compositions in the range 0.33 ≤x H ≤ 1.33 with the purpose of assessing the change of the cerium valence state in the neighborhood of the experimental hydride composition, CeRhSnH 0.8 . In agreement with experiment, the analyses of the electronic and magnetic structures and of the chemical bonding properties point to trivalent cerium for 1 ≤x H ≤ 1.33. In contrast, for lower hydrogen amounts the hydride system stays in an intermediate-valent state for cerium, like in CeRhSn. The influence of the insertion of hydrogen is addressed from both the volume expansion and chemical bonding effects. The latter are found to have the main influence on the change of Ce valence character. Spin polarized calculations point to a finite magnetic moment carried by the Ce 4f states; its magnitude increases with x H in the range 1 ≤x H ≤ 1.33. Copyright Springer 2008

Keywords: 07.55.Jg Magnetometers for susceptibility; magnetic moment; and magnetization measurements; 71.20.-b Electron density of states and band structure of crystalline solids (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1140/epjb/e2008-00369-4

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