Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/242408
Type: Artigo
Title: Dilution effects in spin 7/2 systems: the case of the antiferromagnet GdRhIn5
Author: Lora-Serrano, R.
Garcia, D. J.
Betancourth, D.
Amaral, R. P.
Camilo, N. S.
Estévez-Rams, E.
Ortellado G Z, L. A.
Pagliuso, P. G.
Abstract: We report the structural and magnetic characterization of La-substituted Gd(1-x)LaxRhIn(5) (x < 0.50) anti ferromagnetic (AFM) compounds. The magnetic responses of pure GdRhIn5 are well described by a S=7/ 2 Heisenberg model. When Gd3+ ions are substituted by Lai-', the maximum of the susceptibility and the inflection point of the magnetic specific heat are systematically shifted to lower temperatures accompanied by a broadening of the transition. The data is qualitatively explained by a phenomenological model which incorporates a distribution of magnetic regions with different transition temperatures (TN). The universal behaviour of the low temperature specific heat is found for La (vacancies) concentrations below x=0.40 which is consistent with spin wave excitations. For x=0.5 this universal behaviour is lost. The sharp second order transition of GdRhIn5 is destroyed, as seen in the specific heat data, contrary to what is expected for a Heisenberg model. The results are discussed in the context of the magnetic behaviour observed for the La -substituted (Ce,Tb,Nd)Rhln(5) compounds. (C) 2015 Elsevier B.V. All rights reserved.
We report the structural and magnetic characterization of La-substituted Gd(1-x)LaxRhIn(5) (x < 0.50) anti ferromagnetic (AFM) compounds. The magnetic responses of pure GdRhIn5 are well described by a S=7/ 2 Heisenberg model. When Gd3+ ions are substituted by Lai-', the maximum of the susceptibility and the inflection point of the magnetic specific heat are systematically shifted to lower temperatures accompanied by a broadening of the transition. The data is qualitatively explained by a phenomenological model which incorporates a distribution of magnetic regions with different transition temperatures (TN). The universal behaviour of the low temperature specific heat is found for La (vacancies) concentrations below x=0.40 which is consistent with spin wave excitations. For x=0.5 this universal behaviour is lost. The sharp second order transition of GdRhIn5 is destroyed, as seen in the specific heat data, contrary to what is expected for a Heisenberg model. The results are discussed in the context of the magnetic behaviour observed for the La -substituted (Ce,Tb,Nd)Rhln(5) compounds.
Subject: Antiferromagnetismo, Heisenberg, Modelo de
Country: Holanda
Editor: Elsevier
Citation: Dilution Effects In Spin 7/2 Systems. The Case Of The Antiferromagnet Gdrhin5. Elsevier Science Bv, v. 405, p. 304-310 MAY-2016.
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2015.12.093
Address: https://www.sciencedirect.com/science/article/pii/S030488531530963X?via%3Dihub
Date Issue: 2016
Appears in Collections:IFGW - Artigos e Outros Documentos

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