Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/88037
Type: Artigo
Title: Physical properties of EuPtIn4 intermetallic antiferromagnet
Author: Rosa, P. F. S .
Jesus, C. B. R. de
Fisk, Z.
Pagliuso, P. G.
Abstract: We report the physical properties of EuPtIn4 single crystalline platelets grown by the In-flux technique. This compound crystallizes in the orthorhombic Cmcm structure with lattice parameters a=4.542(1)A., b=16.955(2)A. and c=7.389(1)A. Measurements of magnetic susceptibility, heat capacity, electrical resistivity, and electron spin resonance (ESR) reveal that EuPtIn4 is a metallic Curie-Weiss paramagnet at high temperatures with an effective moment of μeff≈7.8(1)μB due to divalent Eu ions. At low temperatures, antiferromagnetic (AFM) ordering is observed at TN=13.3K followed by a successive anomaly at T=12.6K. In addition, within the magnetic state, a spin-flop transition is observed with Hc~2.5T at T=1.8 K when the magnetic field is applied along the ac-plane. In the paramagnetic state, a single divalent Eu2+ Dysonian ESR line with a Korringa relaxation rate of b=4.1(2)Oe/K is observed. Interestingly, even at high temperatures, both ESR linewidth and electrical resistivity reveal a similar anisotropy. We discuss a possible common microscopic origin for the observed anisotropy in these physical quantities likely associated with an anisotropic magnetic interaction between Eu2+ 4f electrons mediated by conduction electrons. © 2014 Elsevier B.V.
We report the physical properties of EuPtIn4 single crystalline platelets grown by the In flux technique. This compound crystallizes in the orthorhombic Cmcm structure with lattice parameters a = 4.542(1) <(A)over dot>, b = 16.955(2) <(A)over dot> and c = 7.389(1) <(A) over dot>. Measurements of magnetic susceptibility, heat capacity, electrical resistivity, and electron spin resonance (ESR) reveal that EuPtIn4 is a metallic Curie-Weiss paramagnet at high temperatures with an effective moment of mu(eff) approximate to 7.8(1) mu(B) due to divalent Eu ions. At low temperatures, antiferromagnetic (AFM) ordering is observed at T-N = 13.3 K followed by a successive anomaly at T* = 12.6 K. In addition, within the magnetic state, a spin-flop transition is observed with H-c similar to 2.5 T at T = 1.8 K when the magnetic held is applied along the ac-plane. In the paramagnetic state, a single divalent Eu2+ Dysonian ESR line with a Korringa relaxation rate of b = 4.1(2) Oe/K is observed. Interestingly, even at high temperatures, both ESR linewidth and electrical resistivity reveal a similar anisotropy. We discuss a possible common microscopic origin for the observed anisotropy in these physical quantities likely associated with an anisotropic magnetic interaction between Eu2+ 4f electrons mediated by conduction electrons.
Subject: Antiferromagnetismo
Anisotropia
Compostos intermetálicos
Country: Holanda
Editor: Elsevier
Citation: Journal Of Magnetism And Magnetic Materials. Elsevier, v. 371, n. , p. 5 - 9, 2014.
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2014.07.001
Address: https://www.sciencedirect.com/science/article/pii/S0304885314006003
Date Issue: 2014
Appears in Collections:IFGW - Artigos e Outros Documentos

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