Artículo
Extremely high density of magnetic excitations at T=0 in YbCu5-x Aux
Curlík, Ivan; Giovannini, M.; Sereni, Julian Gustavo Renzo
; Zapotoková, M.; Gabáni, S.; Reiffers, M.
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Fecha de publicación:
12/2014
Editorial:
American Physical Society
Revista:
Physical Review B: Condensed Matter and Materials Physics
ISSN:
0163-1829
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Structural, magnetic, transport, and thermal properties of YbCu5-xAux alloys with Au concentration between x=0.4 (at the stability limit of AuBe5-type structure) and x=0.7 are reported. The outstanding features of this system are (i) the constant and record high value of Cm/T≈6.7 J/mol K2 below a characteristic temperature T∗ (ranging between 150 mK and 350 mK), (ii) a power law of temperature dependence Cm/T(T>T∗)=g/Tq, with q ranging between 1.3 and 0.95 for decreasing x from 0.7 to 0.5, and (iii) an observation of incoherent electronic scattering in the resistivity at T<1 K for x≤0.6 despite the fact that Yb magnetic atoms are placed in an ordered lattice. Geometric frustration, originating from the tetrahedral distribution of Yb atoms, appears to be responsible for the lack of magnetic order and the exotic behavior of this system.
Palabras clave:
MAGNETISMO
,
FERMIONES PESADOS
,
COMPUESTOS DE YTERBIO
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Identificadores
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Curlík, Ivan; Giovannini, M.; Sereni, Julian Gustavo Renzo; Zapotoková, M.; Gabáni, S.; et al.; Extremely high density of magnetic excitations at T=0 in YbCu5-x Aux; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 90; 22; 12-2014; 1-7
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