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In situ X-ray powder diffraction study of Ho5Ge4

TitleIn situ X-ray powder diffraction study of Ho5Ge4
Publication TypeJournal Article
Year of Publication2014
AuthorsSingh, NK, Mudryk, Y, Pecharsky, VK, Gschneidner, KA
JournalJournal of Applied Physics
Date Published05
Type of ArticleArticle
ISBN Number0021-8979
Accession NumberWOS:000335643700478
Keywordsmagnetism, rare-earth

In Ho5Ge4 the magnetostructural transition (MST) from high temperature paramagnetic Sm5Ge4-type (O-II type) orthorhombic structure to a new low temperature antiferromagnetic (AFM) monoclinic structure (M beta-structure; the distortion occurs in the ac-plane) results in discontinuities of 400, 400, and 300 ppm along a, b, and c axes, respectively. During MST the unit cell volume exhibits discontinuity of 1000 ppm, and changes in both inter and intra slab bonds are less than 2%. In the AFM state the application of 35 kOe magnetic field leads to a partial reconstruction of the high temperature O-II structure, which is accompanied with a large magnetostriction. The strain energy associated with magnetostriction effects leads to an incomplete field driven MST in the magnetically ordered state. (C) 2014 AIP Publishing LLC.

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