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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 E.T.
Osorio-Guillen J.M.
Ribeiro R.A.
Avila M.A.
Rettori C.
Abstract: Interest in the electronic structure of the intermetallic compound YIn 3 has been renewed with the recent discovery of superconductivity at T ∼ 1 K, which may be filamentary in nature. In this work we perform electron spin resonance (ESR) experiments on Gd3+ doped YIn 3 (Y1-xGdxIn3; 0.001 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 Gd 3+ concentration dependence of the Korringa-like relaxation rate and g-shift (Δg = 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 Δg = +0.047(10) to a negative Δg = -0.008(4). Analysis in terms of a three-band ce model allows the extraction of the corresponding exchange interaction parameters Jfs, Jfp and Jfd. © 2014 IOP Publishing Ltd.
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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