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Proceedings Paper

XAS study of superconducting thin film single crystals without doping
Author(s): H. Oyanagi; A. Tsukada; M. Naito
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Paper Abstract

The electronic state of T'-type cuprates which exhibit superconductivity without doping was investigated by polarized x-ray absorption spectroscopy (XAS) for T'-La2CuO4 and T'-(La,Y)2CuO4 thin film single-crystals. The effect of oxygenation and deoxygenation on the near-edge structures evidences the two processes create and remove apical oxygen defects that strongly suppress superconductivity. The near-edge spectra further indicate that the deoxygenation, well known as a common prerequisite for superconductivity, also creates in-plane oxygen defects, whose contribution to the n-type conduction and superconductivity without doping is not ruled out. The observed local lattice distortion consistent with the neutron scattering experiment may influence a long-range magnetic order favoring a metallic state without doping.

Paper Details

Date Published: 29 February 2012
PDF: 10 pages
Proc. SPIE 8263, Oxide-based Materials and Devices III, 82631F (29 February 2012); doi: 10.1117/12.915983
Show Author Affiliations
H. Oyanagi, National Institute of Advanced Industrial Science and Technology (Japan)
A. Tsukada, NTT Basic Research Labs. (Japan)
Tokyo Univ. of Agriculture and Technology (Japan)
M. Naito, Tokyo Univ. of Agriculture and Technology (Japan)

Published in SPIE Proceedings Vol. 8263:
Oxide-based Materials and Devices III
Ferechteh H. Teherani; David C. Look; David J. Rogers, Editor(s)

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