Scanning tunneling spectroscopy of 3d transition metal oxides and superconductivity of Bi-Sr-Ca-Cu-O artificial lattices

Masaki Kanai; Tomoji Kawai

doi:10.1117/12.250243

5 July 1996 Scanning tunneling spectroscopy of 3d transition metal oxides and superconductivity of Bi-Sr-Ca-Cu-O artificial lattices

Masaki Kanai, Tomoji Kawai

Author Affiliations +

Proceedings Volume 2697, Oxide Superconductor Physics and Nano-Engineering II; (1996) https://doi.org/10.1117/12.250243
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

The density of states (DOS) near the Fermi level has ben observed by scanning tunneling spectroscopy of La_2-xSr_xCuO₄ and La_2-xSr_xNiO₄ thin films. In La_2-xSr_xCuO₄, the DOS around E_F 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 La_2-xSR_xNiO₄ 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 La_2-xSr_xNiO₄ 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+(Ca_1-xSr_xCuO₂)_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.

Citation Download Citation

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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