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Issue 36, 2018
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Determination of the local structure of Sr2−xMxIrO4 (M = K, La) as a function of doping and temperature

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Abstract

The local structure of correlated spin–orbit insulator Sr2−xMxIrO4 (M = K, La) has been investigated by Ir L3-edge extended X-ray absorption fine structure measurements. The measurements were performed as a function of temperature for different dopings induced by substitution of Sr with La or K. It is found that Ir–O bonds have strong covalency and they hardly show any change across the Néel temperature. In the studied doping range, neither Ir–O bonds nor their dynamics, measured by their mean square relative displacements, show any appreciable change upon carrier doping, indicating the possibility of nanoscale phase separation in the doped system. On the other hand, there is a large increase of the static disorder in Ir–Sr correlation, larger for K doping than La doping. Similarities and differences with respect to the local lattice displacements in cuprates are briefly discussed.

Graphical abstract: Determination of the local structure of Sr2−xMxIrO4 (M = K, La) as a function of doping and temperature

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Supplementary files

Article information


Submitted
13 Jun 2018
Accepted
30 Aug 2018
First published
31 Aug 2018

Phys. Chem. Chem. Phys., 2018,20, 23783-23788
Article type
Paper

Determination of the local structure of Sr2−xMxIrO4 (M = K, La) as a function of doping and temperature

K. Terashima, E. Paris, E. Salas-Colera, L. Simonelli, B. Joseph, T. Wakita, K. Horigane, M. Fujii, K. Kobayashi, R. Horie, J. Akimitsu, Y. Muraoka, T. Yokoya and N. L. Saini, Phys. Chem. Chem. Phys., 2018, 20, 23783
DOI: 10.1039/C8CP03756F

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