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Electronically- and crystal-structure-driven magnetic structures and physical properties of RScSb (R = rare earth) compounds: a neutron diffraction, magnetization and heat capacity study

TitleElectronically- and crystal-structure-driven magnetic structures and physical properties of RScSb (R = rare earth) compounds: a neutron diffraction, magnetization and heat capacity study
Publication TypeJournal Article
Year of Publication2014
AuthorsRitter, C, Dhar, SK, Kulkarni, R, Provino, A, Paudyal, D, Manfrinetti, P, Gschneidner, KA
JournalJournal of Physics-Condensed Matter
Volume26
Pagination366001
Date Published09
Type of ArticleArticle
ISBN Number0953-8984
Accession NumberWOS:000341112800010
Keywordser, Magnetic, magnetic structures, nd, neutron diffraction, powder diffraction, pr, properties, rare earth scandium antimonides, rare earth ternary compounds, sm, tb
Abstract

22 K. Below 22 K a second magnetic transition, with propagation vector tau = [1/4 1/4 0], appears in NdScSb. PrScSb has a magnetic structure within, determined by mostly ferromagnetic interactions and antiferromagnetic alignment of the Pr-sites connected through the I-centering (tau = [1 0 0]). A cycloidal spiral structure with a temperature dependent propagation vector tau = [delta delta 1/2] is found in TbScSb. The results of magnetization and heat capacity lend support to the main conclusions derived from neutron diffraction. As inferred from a sharp peak in magnetization, GdScSb orders antiferromagnetically at 56 K. First principles calculations show lateral shift of spin split bands towards lower energy from the Fermi level as the CeScSi-type structure changes to the CeFeSi-type structure. This rigid shift may force the system to transform from exchange split ferromagnetic state to the antiferromagnetic state in RScSb compounds (as seen for example in GdScSb and TbScSb) and is proposed to explain the change-over from a ferromagnetic structure as found in the CeScSi-type compounds CeScSb and NdScSb to the antiferromagnetic state as found in TbScSb and GdScSb.

DOI10.1088/0953-8984/26/36/366001
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