Artículo
Competition between ferromagnetism and frustrated antiferromagnetism in quasi 2D Ce-2.15 (Pd1-xAgx)(1.95)In-0.9 alloys
Fecha de publicación:
16/09/2016
Editorial:
IOP Publishing
Revista:
Journal of Physics: Condensed Matter
ISSN:
0953-8984
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Low temperature thermal and magnetic measurements performed on ferro-magneticl (FM) alloys of composition Ce-2.15(Pd1-xAgx)(1.95)In-0.9 are presented. Pd substitution by Ag depresses T-C(x) from 4.1 K down to 1.1 K for x = 0.5, which is related to the increase of band electrons, with a critical concentration extrapolated to x(cr) approximate to 0.6. The T-C(x) decrease is accompanied by a weakening of the magnetization of the FM phase. At high temperature (T > 30 K) the inverse magnetic susceptibility reveals the presence of robust magnetic moments (2.56 >= mu(eff) >= 2.4 mu(B)), whereas the low value of the Curie-Weiss temperature theta(P) approximate to -10 K excludes any relevant effect from Kondo screening. The specific heat jump at T-C(x) decreases accordingly, while an anomaly emerges at a fixed temperature T* approximate to 1 K. This unexpected anomaly does not show any associated sign of magnetism checked by AC-susceptibility measurements. Since the total magnetic entropy (evaluated around T = T-C(x = 0)) practically does not change with Ag concentration, the transference of degrees of freedom from the FM component to the non-magnetic T* anomaly is deduced. The origin of this anomaly is attributed to an arising magnetic frustration of the ground state and the consequent entropy bottleneck produced by the divergent increasing of density of excitations at low temperature.
Palabras clave:
Magnetic Frustration
,
Cerium Compounds
,
Specific Heat
,
Entropy
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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
Sereni, Julian Gustavo Renzo; Giovannini, M.; Gomez Berisso, Mariano; Gastaldo, Marcelo Fabian; Competition between ferromagnetism and frustrated antiferromagnetism in quasi 2D Ce-2.15 (Pd1-xAgx)(1.95)In-0.9 alloys; IOP Publishing; Journal of Physics: Condensed Matter; 28; 2016; 16-9-2016; 475601-1/9
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