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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/61706
Record Status
Checked
Record Id
61706
Title
Structural analysis and superconductivity of CeFeAsO
1-x
H
x
Contributors
S Matsuishi (Tokyo Institute of Technology)
,
T Hanna (Tokyo Institute of Technology)
,
Y Muraba (Tokyo Institute of Technology)
,
SW Kim (Tokyo Institute of Technology)
,
JE Kim (Japan Synchrotron Radiation Research Institute)
,
M Takata (Japan Synchrotron Radiation Research Institute, RIKEN SPring-8 Center)
,
S Shamoto (Japan Atomic Energy Agency)
,
RI Smith (STFC Rutherford Appleton Lab.)
,
H Hosono (Tokyo Institute of Technology)
Abstract
We performed the neutron powder diffraction (NPD) and synchrotron x-ray diffraction measurements on CeFeAsO1-x(D,H)x (x = 0.0 - 0.48) as a representative of 1111-type family of iron-based superconductors LnFeAsO1-xHx (Ln = lanthanoid). Deuterated and hydrogenated samples (CeFeAsO1-xDx and CeFeAsO1-xHx) were synthesized by the solid-state reaction of a metal oxide, arsenides, and a hydride and a deuteride source under an applied pressure of 2 GPa. No distinct differences were found between the structural and superconducting properties of the hydride and deuteride samples. Rietveld analyses of the NPD patterns demonstrated that deuterium exclusively substitutes on the oxygen sites in the 1111-type structures according to the nominal composition. Bulk superconductivity was observed over a wide x region (0.1 < x < 0.4) and the superconducting dome had a rather flat shape with a maximum Tc = 47 K at around x = 0.25. It was concluded from density functional theory calculations and comparison with the superconducting dome of the fluorine-substituted system that the charge state of the hydrogen substituting the oxygen sites was -1. The relationship between the lattice parameter a and Tc in our samples prepared from metal hydrides is almost the same as that reported previously for samples prepared from cerium hydroxide. These results strongly suggest that H- ions exclusively occupy the oxygen sites in both samples, regardless of the hydrogen species in the starting material.
Organisation
ISIS
,
ISIS-GEM
,
STFC
Keywords
Physics
,
Materials
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Phys Rev B
85, no. 1 (2012): 014514.
doi:10.1103/PhysRevB.85.014514
2012
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