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.

Details

Title
Different electronic states at crystallographically inequivalent CuO2 planes on four-layered cuprates HgBa2Ca3Cu4O10+δ
Author
Sekine, R 1 ; Nakayama, S 2 ; Tsukada, A 3 ; Denholme, S J 3 ; Miyakawa, N 3 ; Tokiwa, K 2 

 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 
 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 
Publication year
2018
Publication date
Mar 2018
Publisher
IOP Publishing
ISSN
17426588
e-ISSN
17426596
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2572055623
Copyright
© 2018. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.