29 February 2012 XAS study of superconducting thin film single crystals without doping
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Proceedings Volume 8263, Oxide-based Materials and Devices III; 82631F (2012) https://doi.org/10.1117/12.915983
Event: SPIE OPTO, 2012, San Francisco, California, United States
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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
H. Oyanagi, A. Tsukada, M. Naito, "XAS study of superconducting thin film single crystals without doping", Proc. SPIE 8263, Oxide-based Materials and Devices III, 82631F (29 February 2012); doi: 10.1117/12.915983; https://doi.org/10.1117/12.915983

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