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Type: Artigo de periódico
Title: Evidence for a subtle structural symmetry breaking in EuB6
Author: Martinho, H
Rettori, C
Dalpian, GM
da Silva, JLF
Fisk, Z
Oseroff, SB
Abstract: This work presents a systematic Raman scattering study and first-principles calculations for the EuB6 system. Evidence for the presence of an incipient (similar to 1x10(-4) angstrom) tetragonal symmetry break of its crystalline structure was found. Forbidden Raman modes at omega(fRm(1)) similar to 1170 cm(-1), omega(fRm(2)) similar to 1400 cm(-1), and omega(fRm(3)) similar to 1500 cm(-1) were observed. The tetragonal symmetry of omega(fRm(2)) and omega(fRm(3)) together with spin-polarized first-principles simulations of the structural and magnetic properties fully support such a break of symmetry. Our data and calculations explain the occurrence of ferromagnetism in Eu hexaborides, previously reported.
Country: Inglaterra
Editor: Iop Publishing Ltd
Rights: fechado
Identifier DOI: 10.1088/0953-8984/21/45/456007
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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