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Abstract
We report tunneling conductances due to two kinds of crystallographically inequivalent CuO2 planes on multi-layered cuprates Hg0.95Ba2Ca3Cu4O10.05 (Hg1234) measured by a point-contact tunneling technique. One is an outer CuO2 plane (OP) which has a pyramidal five-oxygen coordination, another is an inner CuO2 plane (IP) which has a square four oxygen coordination. These tunneling conductances exhibit two kinds of superconducting gaps Δ with clearly different sizes. That is, Δ on Hg1234 was 36 ± 2 meV and 55 ± 2 meV for OP and IP, respectively. Moreover, we report the correlation between the mode energy Ω and Δ. The Ω/Δ exhibits the common feature with other cuprates and does not exceed 2. This behaviour implies that the collective spin excitation is a candidate for the mediator on pair formation.
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Details
1 Department of Applied Electronics, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan; Department of Applied Physics, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
2 Department of Applied Electronics, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
3 Department of Applied Physics, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan