Artículo
Magnetostriction reveals orthorhombic distortion in tetragonal Gd compounds
Betancourth Giraldo, Diana Maria
; Correa, Víctor Félix
; Facio, Jorge Ismael
; Fernández, J.; Vildosola, Veronica Laura
; Lora Serrano, R.; Cadogan, J.M.; Aligia, Armando Ángel
; Cornaglia de la Cruz, Pablo Sebastian
; Garcia, Daniel Julio
Fecha de publicación:
04/2019
Editorial:
American Physical Society
Revista:
Physical Review B
ISSN:
2469-9969
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We report detailed thermal expansion and magnetostriction experiments on GdCoIn5 and GdRh(In1-xCdx)5 (x=0 and 0.025) single-crystal samples that show a sudden change in the dilation at a field Bâ for temperatures below the Néel transition temperature TN. We present a first-principles model including crystal-field effects, dipolar and exchange interactions, and the dependence of the latter with lattice distortions in order to fully account for the magnetostriction and magnetic susceptibility data. The mean-field solution of the model shows that a transition between metastable states occurs at the field Bâ. It also indicates that two degenerate phases should coexist at temperatures below TN, which may explain the lack of observation, in high-resolution x-ray experiments, of an orthorhombic distortion at the Néel transition, even though the experimentally determined magnetic structure breaks the tetragonal symmetry and the magnetoelastic coupling from our model is significant. These conclusions could be extended to other tetragonal Gd-based compounds that present the same phenomenology.
Palabras clave:
Magnetostriction
,
Rare earth compounds
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Betancourth Giraldo, Diana Maria; Correa, Víctor Félix; Facio, Jorge Ismael; Fernández, J.; Vildosola, Veronica Laura; et al.; Magnetostriction reveals orthorhombic distortion in tetragonal Gd compounds; American Physical Society; Physical Review B; 99; 13; 4-2019; 1-10; 134406
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