Metal-superconductor-insulator transitions in oxide materials

W. Y. Liang

doi:10.1117/12.24537

1 February 1991 Metal-superconductor-insulator transitions in oxide materials

W. Y. Liang

Proceedings Volume 1362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications; (1991) https://doi.org/10.1117/12.24537
Event: Physical Concepts of Materials for Novel Optoelectronic Device Applications, 1990, Aachen, Germany

Abstract

Data are derived experimentally for the phase diagram for high-Tc superconductors based on the (Ca(1-x)Y(X))Sr2(Tl(1-z)Pb(z)Cu2)O7. Transport, structure, and specific-heat measurements are described and discussed in terms of the relationships between the metallic/nonsuperconducting, superconducting, and insulating (M-S-I) phases of the cuprate superconductor. The conditions of normal resistivity are shown at 150 K in terms of variation with Y ions in (Ca(1-x)Y(x))Sr2(Tl0.5Pb0.5Cu2)O7, and it is shown that charge carriers at temperatures close to maximum Tc can be studied by means of thermoelectric power. Specific-heat measurements show that fluctuations of superconductivity in state II are very large near the insulating boundary where there are strong pair interactions but few carriers. A systematic trend is revealed that is a function of changing carrier concentration and that has important differences on either side of maximum Tc.

Citation Download Citation

W. Y. Liang "Metal-superconductor-insulator transitions in oxide materials", Proc. SPIE 1362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications, (1 February 1991); https://doi.org/10.1117/12.24537

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