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

Kensei 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, N. L. Saini

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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 possibility of a 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.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - Oct 1 2018

ASJC Scopus subject areas

  • General

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