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|Type:||Artigo de periódico|
|Title:||Temperature dependence of the Cr3+ site axial distortion in LiSrAlF6 and LiSrGaF6 single crystals|
|Abstract:||The electron spin resonance (ESR) of Cr3+ in LiSrAlF6 (LiSAF:Cr) and LiSrGaF6 (LiSGaF:Cr) single crystals has been measured in the temperature range between 270 and 470 K. The external magnetic field orientation dependence of the spectra is described by a spin Hamiltonian of axial symmetry for both compounds. The value of the zero-field splitting axial parameter (D) for LiSGaF:Cr decreases from 6.60 x 10(-2) cm(-1) to 5.60 x 10(-2) cm(-1), while for LiSAF:Cr it increases from 1.30 x 10(-2) cm(-1) to 1.60 x 10(-2) cm(-1) for increasing temperature. The larger values of D obtained for LiSGaF:Cr show that the distortion of the octahedral Cr site is greater in this compound, in agreement with x-ray diffraction results reported in the literature.|
|Editor:||Iop Publishing Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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