TY - JOUR
T1 - Determination of the local structure of Sr2-xMxIrO4 (M = K, La) as a function of doping and temperature
AU - Terashima, Kensei
AU - Paris, Eugenio
AU - Salas-Colera, Eduardo
AU - Simonelli, Laura
AU - Joseph, Boby
AU - Wakita, Takanori
AU - Horigane, Kazumasa
AU - Fujii, Masanori
AU - Kobayashi, Kaya
AU - Horie, Rie
AU - Akimitsu, Jun
AU - Muraoka, Yuji
AU - Yokoya, Takayoshi
AU - Saini, Naurang Lal
N1 - Funding Information:
We thank ESRF staff for support in the EXAFS data collection. K. T. and T. W. would like to acknowledge the hospitality at the Sapienza University of Rome. This research was partially supported by the Program for Promoting the Enhancement of Research University from MEXT, the Program for Advancing Strategic International Networks to Accelerate the Circulation of Talented Researchers from JSPS (R2705), and JSPS KAKENHI (Grants No. 2704, 25000003, 26247057, and 15H05886). This work is a part of the executive protocol of the general agreement for cooperation between the Sapienza Unversity of Rome and Okayama University, Japan.
Publisher Copyright:
© 2018 the Owner Societies.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
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U2 - 10.1039/c8cp03756f
DO - 10.1039/c8cp03756f
M3 - Article
C2 - 30199083
AN - SCOPUS:85053934064
VL - 20
SP - 23783
EP - 23788
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 36
ER -