TY - JOUR
T1 - Impact of local atomic fluctuations on superconductivity of Pr-substituted CaFe2As2 studied by X-ray fluorescence holography
AU - Kudo, Kazutaka
AU - Ioka, Satoshi
AU - Happo, Naohisa
AU - Ota, Hiromi
AU - Ebisu, Yoshihiro
AU - Kimura, Koji
AU - Hada, Takuma
AU - Kimura, Takumi
AU - Tajiri, Hiroo
AU - Hosokawa, Shinya
AU - Hayashi, Kouichi
AU - Nohara, Minoru
N1 - Funding Information:
Acknowledgments This work was partially supported by Grants-in-Aid for Scientific Research (15H01047, 15H05886, and 16K05451) provided by the Japan Society for the Promotion of Science. The X-ray fluorescence holography experiments using synchrotron radiation at BL13XU, SPring-8, Japan, were supported by the Japan Synchrotron Radiation Research Institute (Proposal Nos. 2015B1431, 2016A1302, and 2016B1376).
Publisher Copyright:
© 2019 The Physical Society of Japan
PY - 2019
Y1 - 2019
N2 - The local structures of Ca1−xPrxFe2As2 (x ¼ 0; 0:1) were studied by X-ray fluorescence holography. Significant fluctuations were observed in As positions for CaFe2As2. The fluctuations increased strongly around Ca atoms by Pr substitution, while those around the substituted Pr atoms were largely unchanged. The inherent positional fluctuations of As in CaFe2As2 can be related to the various bonding forms of As and the complex structure with many energy minima suggested from the single-crystal and powder X-ray diffraction experiments. In the Pr-doped CaFe2As2, the increased and unchanged fluctuations around Ca and Pr atoms, respectively, could explain the local superconductivity around Pr atoms and its absence around Ca atoms suggested from scanning tunneling microscopy=spectroscopy.
AB - The local structures of Ca1−xPrxFe2As2 (x ¼ 0; 0:1) were studied by X-ray fluorescence holography. Significant fluctuations were observed in As positions for CaFe2As2. The fluctuations increased strongly around Ca atoms by Pr substitution, while those around the substituted Pr atoms were largely unchanged. The inherent positional fluctuations of As in CaFe2As2 can be related to the various bonding forms of As and the complex structure with many energy minima suggested from the single-crystal and powder X-ray diffraction experiments. In the Pr-doped CaFe2As2, the increased and unchanged fluctuations around Ca and Pr atoms, respectively, could explain the local superconductivity around Pr atoms and its absence around Ca atoms suggested from scanning tunneling microscopy=spectroscopy.
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U2 - 10.7566/JPSJ.88.063704
DO - 10.7566/JPSJ.88.063704
M3 - Article
AN - SCOPUS:85067278043
VL - 88
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 6
M1 - 063704
ER -