Single-crystal neutron diffraction study of short-range magnetic correlations in Tb5Ge4

TitleSingle-crystal neutron diffraction study of short-range magnetic correlations in Tb5Ge4
Publication TypeJournal Article
Year of Publication2009
AuthorsTian W, Kreyssig A, Zarestky JL, Tan L, Nandi S, Goldman AI, Lograsso TA, Schlagel DL, Gschneidner KA, Pecharsky VK, McQueeney RJ
Journal TitlePhysical Review B
Date Published10/01
ISBN Number1098-0121
Accession NumberISI:000271351300072
Keywordsalloys, behavior, gd-5(si2ge2), refrigeration, system

We present a single-crystal neutron diffraction study of the magnetic short-range correlations in Tb5Ge4 which orders antiferromagnetically below the Neel temperature T-N approximate to 92 K. Strong diffuse scattering arising from magnetic short-range correlations was observed in wide temperature ranges both below and above T-N. The antiferromagnetic ordering in Tb5Ge4 is described to consist of strongly coupled ferromagnetic block layers in the ac plane that stack along the b axis with weak antiferromagnetic interlayer coupling. Diffuse scattering was observed along both a* and b* directions indicating three-dimensional short-range correlations. Moreover, the q dependence of the diffuse scattering is Squared Lorentzian in form suggesting a strongly clustered magnetic state that may be related to the proposed Griffiths-like phase in Gd5Ge4.

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