Selective hybridization between the main band and the superstructure band in the Bi2Sr2CaCu2O8+δ superconductor

Qiang Gao; Hongtao Yan; Jing Liu; Ping Ai; Yongqing Cai; Cong Li; Xiangyu Luo; Cheng Hu; Chunyao Song; Jianwei Huang; Hongtao Rong; Yuan Huang; Qingyan Wang; Guodong Liu; Genda Gu; Fengfeng Zhang; Feng Yang; Shenjin Zhang; Qinjun Peng; Zuyan Xu; Lin Zhao; Tao Xiang; X. J. Zhou

doi:10.1103/PhysRevB.101.014513

Selective hybridization between the main band and the superstructure band in the Bi2Sr2CaCu2O8+δ superconductor

Qiang Gao, Hongtao Yan, Jing Liu, Ping Ai, Yongqing Cai, Cong Li, Xiangyu Luo, Cheng Hu, Chunyao Song, Jianwei Huang, Hongtao Rong, Yuan Huang, Qingyan Wang, Guodong Liu, Genda Gu, Fengfeng Zhang, Feng Yang, Shenjin Zhang, Qinjun Peng, Zuyan Xu, Lin Zhao, Tao Xiang, X. J. Zhou

DOI 10.1103/PhysRevB.101.014513 · Physical Review B

T1

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Abstract

High-resolution laser-based angle-resolved photoemission measurements have been carried out on Bi2Sr2CaCu2O8+δ (Bi2212) and Bi2Sr2−xLaxCuO6+δ (Bi2201) superconductors. Unexpected hybridization between the main band and the superstructure band in Bi2212 is clearly revealed. In the momentum space where one main Fermi surface intersects with one superstructure Fermi surface, four bands are observed instead of two. The hybridization exists in both the superconducting state and the normal state, and in Bi2212 samples with different doping levels. Such a hybridization is not observed in Bi2201. This phenomenon can be understood by considering the bilayer splitting in Bi2212, the selective hybridization of two bands with peculiar combinations, and the altered matrix element effects of the hybridized bands. These observations indicate that the origin of the superstructure bands is intrinsic to the CuO2 planes. Therefore, understanding physical properties and superconductivity in Bi2212 should consider the complete Fermi surface topology which involves the main bands, the superstructure bands, and their interactions.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	78	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	64	Pressure not reported	unknown
Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	unknown