1 March 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); doi: 10.1117/12.915983
Event: SPIE OPTO, 2012, San Francisco, California, United States
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.
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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 (1 March 2012); doi: 10.1117/12.915983; https://doi.org/10.1117/12.915983
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KEYWORDS
Oxygen

Doping

Thin films

Superconductivity

Distortion

Liquid crystal on silicon

Crystals

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