XAS study of superconducting thin film single crystals without doping

H. Oyanagi; A. Tsukada; M. Naito

doi:10.1117/12.915983

29 February 2012 XAS study of superconducting thin film single crystals without doping

H. Oyanagi, A. Tsukada, M. Naito

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

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'-(L_a,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.

Citation Download Citation

H. Oyanagi, A. Tsukada, and 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); https://doi.org/10.1117/12.915983

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