Magnetostructural transition in Ho5Ge4

TitleMagnetostructural transition in Ho5Ge4
Publication TypeJournal Article
Year of Publication2009
AuthorsSingh NK, Paudyal D, Mudryk Y, Pecharsky VK, Gschneidner KA
Journal TitlePhysical Review B
Volume79
Pages094115
Date Published03/01
ISBN Number1098-0121
Accession NumberISI:000264768200045
Keywordsantiferromagnetic materials, density functional theory, germanium alloys, giant magnetoresistance, high-temperature effects, holmium alloys, magnetic structure, magnetocaloric effects, magnetostriction, paramagnetic-antiferromagnetic transitions, solid-st
Abstract

First-principles calculations predict that, in the antiferromagnetic state, Ho5Ge4 should adopt a unique monoclinic structure with an unusual distortion in the ac plane, making it a unique member of a broadly researched R5T4 family of compounds that are best known for their giant magnetocaloric, magnetoresistive, and magnetostrictive effects. Experiments prove that, in Ho5Ge4, the magnetic transition from the paramagnetic to the antiferromagnetic state is indeed accompanied by a structural transformation from the Sm5Ge4-type orthorhombic to the predicted monoclinic structure. Surprisingly, a magnetic field can partially reconstruct the high-temperature paramagnetic Sm5Ge4-type structure of Ho5Ge4 when applied to the magnetically ordered compound.

URL<Go to ISI>://000264768200045
DOI10.1103/Physrevb.79.094115