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Type: Artigo de periódico
Title: Gd3+ spin-lattice relaxation via multi-band conduction electrons in Y1-xGdxIn3: an electron spin resonance study
Author: Cabrera-Baez, M
Iwamoto, W
Magnavita, ET
Osorio-Guillen, JM
Ribeiro, RA
Avila, MA
Rettori, C
Abstract: Interest in the electronic structure of the intermetallic compound YIn3 has been renewed with the recent discovery of superconductivity at T similar to 1 K, which may be filamentary in nature. In this work we perform electron spin resonance (ESR) experiments on Gd3+ doped YIn3 (Y1-xGdxIn3; 0.001 less than or similar to x <= 0.08), showing that the spin-lattice relaxation of the Gd3+ ions, due to the exchange interaction between the Gd3+ localized magnetic moment and the conduction electrons (ce), is processed via the presence of s-, p- and d-type ce at the YIn3 Fermi level. These findings are revealed by the Gd3+ concentration dependence of the Korringa-like relaxation rate d(Delta H)/dT and g-shift (Delta g = g - 1.993), that display bottleneck relaxation behavior for the s- electrons and unbottleneck behavior for the p- and d-electrons. The Korringa- like relaxation rates vary from 22(2) Oe/K for x. 0.001 to 8(2) Oe/K for x = 0.08 and the g- shift values change, respectively, from a positive.g = + 0.047(10) to a negative Delta g = - 0.008( 4). Analysis in terms of a three-band ce model allows the extraction of the corresponding exchange interaction parameters J(fs), J(fp) and J(fd).
Subject: YIn3
electron spin resonance
heat capacity
magnetic susceptibility
electronic structure
Country: Inglaterra
Editor: Iop Publishing Ltd
Citation: Journal Of Physics-condensed Matter. Iop Publishing Ltd, v. 26, n. 17, 2014.
Rights: fechado
Identifier DOI: 10.1088/0953-8984/26/17/175501
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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