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Griffiths-like phase of magnetocaloric R5(SixGe1−x)4 (R=Gd, Tb, Dy, and Ho)

AutorPereira, A. M.; Morellón, Luis; Magen, Cesar; Algarabel, Pedro A. ; Ibarra, M. Ricardo
Fecha de publicaciónnov-2010
EditorAmerican Physical Society
CitaciónPhysical Review B 82(17): 172406 (2010)
ResumenWe report on the discovery of Griffiths-like phase in several compounds of the R5(SixGe1−x)4 (R=Gd, Tb, Dy, and Ho) system, through the existence of an anomalous behavior on the reciprocal magnetic susceptibility (χ−1). We found that this anomaly is restricted to the samples which present the Gd5Si2Ge2-type (monoclinic) or the Sm5Ge4-type {orthorhombic-II [O(II)]} structural phases at room temperature. This peculiar effect originates from local disorder within the crystallographic structure, stabilized and enhanced by the competing intralayer and interlayer magnetic interactions. From this strong competition, a ratio of ∼0.5 between Néel and the Griffiths-like temperatures is always found in the O(II) structure. In addition, a universal (x,T) phase diagram is proposed with an interpretation based on percolative processes.
Descripción4 páginas, 3 figuras.-- PACS number(s): 75.30.Sg, 64.60.ah, 75.40.Cx, 75.50.-y.-- et al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.82.172406
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