Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/88033
Type: Artigo
Title: Low-temperature magnetic properties of GdCoIn5
Author: Betancourth, D.
Facio, J. I.
Pedrazzini, P.
Jesus, C. B. R.
Pagliuso, P. G.
Vildosola, V.
Cornaglia, P. S.
García, D. J.
Correa, V. F.
Abstract: A comprehensive experimental and theoretical study of the low temperature properties of GdCoIn5 was performed. Specific heat, thermal expansion, magnetization and electrical resistivity were measured in good quality single crystals down to 4He temperatures. All the experiments show a second-order-like phase transition at 30 K probably associated with the onset of antiferromagnetic order. The magnetic susceptibility shows a pronounced anisotropy below TN with an easy magnetic axis perpendicular to the crystallographic ɥ-axis. Total energy GGA+U calculations indicate a ground state with magnetic moments localized at the Gd ions and allowed a determination of the Gd-Gd magnetic interactions. Band structure calculations of the electron and phonon contributions to the specific heat together with Quantum Monte Carlo calculations of the magnetic contributions show a very good agreement with the experimental data. Comparison between experiment and calculations suggests a significant anharmonic contribution to the specific heat at high temperature (T≳100K).
A comprehensive experimental and theoretical study of the low temperature properties of GdCoIn5 was performed. Specific heat, thermal expansion, magnetization and electrical resistivity were measured in good quality single crystals down to He-4 temperatures. All the experiments show a second-order-like phase transition at 30 K probably associated with the onset of antiferromagnetic order. The magnetic susceptibility shows a pronounced anisotropy below T-N with an easy magnetic axis perpendicular to the crystallographic (c) over cap axis Total energy GGA+U calculations indicate a ground state with magnetic moments localized at the Gd ions and allowed a determination of the Gd-Gd magnetic interactions. Band structure calculations of the electron and phonon contributions to the specific heat together with Quantum Monte Carlo calculations of the magnetic contributions show a very good agreement with the experimental data Comparison between experiment and calculations suggests a significant anharmonic contribution to the specific heal at high temperature (T greater than or similar to 100 K).
Subject: Compostos de metais de terras raras, Antiferromagnetismo, Anisotropia
Country: Holanda
Editor: Elsevier
Citation: Journal Of Magnetism And Magnetic Materials. Elsevier, v. 374, n. , p. 744 - 747, 2014.
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2014.09.024
Address: https://www.sciencedirect.com/science/article/pii/S0304885314008440
Date Issue: 2015
Appears in Collections:IFGW - Artigos e Outros Documentos

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