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5 July 1996 Scanning tunneling spectroscopy of 3d transition metal oxides and superconductivity of Bi-Sr-Ca-Cu-O artificial lattices
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Masaki Kanai and Tomoji Kawai "Scanning tunneling spectroscopy of 3d transition metal oxides and superconductivity of Bi-Sr-Ca-Cu-O artificial lattices", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); https://doi.org/10.1117/12.250243
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