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Type: Artigo de periódico
Title: Magnetic Structures Of The Anisotropic Intermetallic Compounds Er 2coga8 And Tm2 Coga8
Author: Johnson R.D.
Frawley T.
Manuel P.
Khalyavin D.D.
Adriano C.
Giles C.
Pagliuso P.G.
Hatton P.D.
Abstract: Two members of the isostructural R2 CoGa8 intermetallic series, Er2CoGa8 and Tm2 CoGa8, have been studied by powder neutron diffraction. Antiferromagnetic ordering of the rare-earth sublattices was confirmed to occur at 3.0 K and 2.0 K, respectively. Furthermore, determination of the critical exponent showed Er2 CoGa8 to adopt a three-dimensional universality class. In spite of a common magnetic easy axis and similar structural characteristics, the antiferromagnetic structures were found to be different for the erbium- and thulium-based compounds. The corresponding magnetic space groups were determined to be P2a mm m′ and PC mmm. The difference in magnetic structures is discussed based on crystal electric field effects that are known to be prevalent in such materials. © 2010 The American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.82.104407
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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