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Type: Artigo de periódico
Title: Crystal Structure And Physical Properties Of Gd3co 4sn13 Intermetallic Antiferromagnet
Author: Pires M.A.
Ferreira L.M.
Duque J.G.S.
Urbano R.R.
Aguero O.
Torriani I.
Rettori C.
Bittar E.M.
Pagliuso P.G.
Abstract: We have synthesized single crystalline samples of Gd3 Co4 Sn13 intermetallic compound using a Sn-flux method. This compound crystallizes with a cubic Yb3 Co4 Sn13 -type structure, space group Pm-3n, which has 40 atoms per unit cell. Measurements of the magnetic susceptibility, heat capacity, electrical resistivity, and electron spin resonance (ESR) revealed that Gd3 Co4 Sn13 is a metallic Curie-Weiss paramagnet at high temperature and presents an antiferromagnetic ordering below TN =14.5 K. In the paramagnetic state, a single Gd3+ ESR line with a nearly temperature independent g∼2.005 (2) is observed, and its linewidth follows a Korringa-like behavior as a function of temperature. From the Korringa rate (ΔHΔT∼4 OeK) and g -shift (Δg∼0.012) obtained from the ESR experiments combined with the magnetic susceptibility and specific heat data for Gd3 Co4 Sn13, we have extracted the exchange parameters between the Gd3+ local moments and the conduction-electrons (c-e) in this compound. This exchange parameter Jfs ≈10 meV was found to be c-e wave-vector independent and the electronic structure of Gd3 Co4 Sn13 has a single band character. © 2006 American Institute of Physics.
Rights: aberto
Identifier DOI: 10.1063/1.2173937
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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