Temperature-dependent polarized extended X-ray absorption fine-structure (EXAFS) measurements are made on the superconducting FeSe0.25Te0.75 single crystal. The Fe-Se bond length is found to be significantly shorter than the average crystallographic Fe-Se/Te distance, and almost equal to the one for the system without Te. On the other hand, the Fe-Te bond length is nearly equal to the one known for a binary FeTe system. This suggests that the Se and Te occupy distinct sites in the ternary FeSe0.25Te0.75, indicating the breaking of the average crystal symmetry with locally inhomogeneous atomic distribution.
Determination of local structure in FeSe(0.25)Te(0.75) single crystal by polarized EXAFS / Iadecola, Antonella; B., Joseph; L., Simonelli; Y., Mizuguchi; Y., Takano; Saini, Naurang Lal. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 90:(2010), pp. 67008_1-67008_6. [10.1209/0295-5075/90/67008]
Determination of local structure in FeSe(0.25)Te(0.75) single crystal by polarized EXAFS
IADECOLA, ANTONELLA;SAINI, Naurang Lal
2010
Abstract
Temperature-dependent polarized extended X-ray absorption fine-structure (EXAFS) measurements are made on the superconducting FeSe0.25Te0.75 single crystal. The Fe-Se bond length is found to be significantly shorter than the average crystallographic Fe-Se/Te distance, and almost equal to the one for the system without Te. On the other hand, the Fe-Te bond length is nearly equal to the one known for a binary FeTe system. This suggests that the Se and Te occupy distinct sites in the ternary FeSe0.25Te0.75, indicating the breaking of the average crystal symmetry with locally inhomogeneous atomic distribution.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.