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Proceedings Paper

Scanning tunneling spectroscopy of 3d transition metal oxides and superconductivity of Bi-Sr-Ca-Cu-O artificial lattices
Author(s): Masaki Kanai; Tomoji Kawai
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Paper Abstract

The density of states (DOS) near the Fermi level has ben observed by scanning tunneling spectroscopy of La2-xSrxCuO4 and La2-xSrxNiO4 thin films. In La2-xSrxCuO4, the DOS around EF gradually appears with tailing both from the conduction band and the valence band edges accompanied with the increase of carrier concentration. Compared with cuprate thin films, the DOS variation of La2-xSRxNiO4 with carrier increase is slow and no clear differences in the STS are observed in the region with 0.15 < x < 0.5 in the nickelate. However, the DOS of heavily doped La2-xSrxNiO4 with x > 1.0 is quite similar to that of doped cuprates. Systematic investigation of superconducting transition temperatures (Tc) has been performed on the Bi2O2/SrO-inserted infinite-layer lattices, Bi2O2/SrO+(Ca1-xSrxCuO2)n with n equals 2 to 10. The n dependence of Tc varies depending upon the Sr/Ca ratio at alkaline earth metal sites. The observed results are explained by the prediction based on inter-layer effect between two-dimensional resonating valence bond sheets.

Paper Details

Date Published: 5 July 1996
PDF: 9 pages
Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); doi: 10.1117/12.250243
Show Author Affiliations
Masaki Kanai, Osaka Univ. (Japan)
Tomoji Kawai, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 2697:
Oxide Superconductor Physics and Nano-Engineering II
Ivan Bozovic; Davor Pavuna, Editor(s)

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