Title :
Tunneling spectroscopy of the Superconductor-Insulator Transition on Bi2Sr2Ca1−xYxCu2O8+δ and (Bi1−yPby)2Sr2Ca1&
Author :
Qing Tao Meng ; Komaki, Shozo ; Tsuneoka, Takuya ; Hanada, Hirotoshi ; Maeda, Shigenobu ; Murano, Taiki ; Ichikawa, Fusao ; Itoh, Kenji ; Nishisako, Yuya ; Shigeta, Iduru ; Hiroi, Masahiko
Author_Institution :
Dept. of Phys., Kumamoto Univ., Kumamoto, Japan
Abstract :
The purpose of our present study is to understand the Superconductor-Insulator Transition. In this paper we report tunnel experiments on Bi2Sr2Ca1-xYxCu2O8+δ (Y-Bi2212) crystals with x = 0, 0.01, 0.05, 0.1, 0.11 and 0.12. The results are discussed about Copper pairs existing. Tunneling spectra were measured for Y-Bi2212 crystal-SiO-Ag planar junctions. For superconducting samples the V-shape gap structure and zero bias conductance peaks (ZBCP) were observed. While neither superconducting gap nor ZBCP was observed for insulating samples. These results suggest that Cooper pairs break up on the insulating side of SIT. In our spectra there were also several characteristic behaviors.
Keywords :
Cooper pairs; bismuth compounds; calcium compounds; high-temperature superconductors; lead compounds; strontium compounds; superconducting energy gap; superconducting transitions; superconductive tunnelling; tunnelling spectroscopy; yttrium compounds; (Bi1-yPby)2Sr2Ca1-xYxCu2O8+δ; Bi2Sr2Ca1-xYxCu2O8+δ; Cooper pair; V-shape gap structure; superconducting crystals; superconducting gap; superconductor-insulator transition; tunneling spectroscopy; zero bias conductance; Bismuth; Coherence; Crystals; Spectroscopy; Superconductivity; Tunneling; Bi2212; ZBCP Introduction; superconductivity; transition; tunnel;
Conference_Titel :
Applied Superconductivity and Electromagnetic Devices (ASEMD), 2013 IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-0068-8
DOI :
10.1109/ASEMD.2013.6780707
