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|Type:||Artigo de periódico|
|Title:||Evidence for a subtle structural symmetry breaking in EuB6|
da Silva, JLF
|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.|
|Editor:||Iop Publishing Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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