The local structure of SmFe1-xRuxAsO 0.85F0.15 (x = 0.0, 0.05, 0.25 and 0.5) superconductors has been investigated by temperature dependent As K-edge extended x-ray absorption fine structure analysis. The effect of Ru substitution remains confined to the iron-arsenide layer but neither the static disorder nor the Fe-As bond strength suffers any change for x ≤ 0.25. With further Ru substitution the static disorder increases while the Fe-As bond strength remains unchanged. Also, the Ru-As distance (∼2.42 Å), different from the Fe-As distance (∼2.39 Å), does not show any change in its force constant with Ru substitution. These observations suggest that the SmFe 1-xRuxAsO0.85F0.15 system breaks down into coexisting local electronic phases on isoelectric substitution in the active FeAs layer. © 2013 IOP Publishing Ltd.
Temperature dependent local atomic displacements in Ru substituted SmFe1-xRuxAsO0.F-85(0).(15) superconductors / B., Joseph; Iadecola, Antonella; L., Simonelli; Maugeri, Laura; A., Martinelli; A., Palenzona; M., Putti; Saini, Naurang Lal. - In: SUPERCONDUCTOR SCIENCE & TECHNOLOGY. - ISSN 0953-2048. - 26:6(2013), p. 065005. [10.1088/0953-2048/26/6/065005]
Temperature dependent local atomic displacements in Ru substituted SmFe1-xRuxAsO0.F-85(0).(15) superconductors
IADECOLA, ANTONELLA;MAUGERI, LAURA;SAINI, Naurang Lal
2013
Abstract
The local structure of SmFe1-xRuxAsO 0.85F0.15 (x = 0.0, 0.05, 0.25 and 0.5) superconductors has been investigated by temperature dependent As K-edge extended x-ray absorption fine structure analysis. The effect of Ru substitution remains confined to the iron-arsenide layer but neither the static disorder nor the Fe-As bond strength suffers any change for x ≤ 0.25. With further Ru substitution the static disorder increases while the Fe-As bond strength remains unchanged. Also, the Ru-As distance (∼2.42 Å), different from the Fe-As distance (∼2.39 Å), does not show any change in its force constant with Ru substitution. These observations suggest that the SmFe 1-xRuxAsO0.85F0.15 system breaks down into coexisting local electronic phases on isoelectric substitution in the active FeAs layer. © 2013 IOP Publishing Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
