Tunneling spectra of underdoped Bi2Sr2Ca1-xYxCu2O8+$\delta$ intrinsic Josephson junctions

doi:10.1088/1674-1056/19/8/087402

Abstract Mesa-structured submicron intrinsic Josephson junctions are successfully fabricated and well characterized on underdoped Bi₂Sr₂Ca_1-xY_xCu₂O_{8+ $δ$}single crystals with a T_c of 80 K. Tunneling spectra at the temperatures ranging from 4.2 K to 295 K are measured. A pulse technique is used to reduce sample heating for the measurement near pseudogap opening temperature T^*～280 K. Our experimental results show that the superconducting gap, the peakdip separation, and the pseudogap opening temperature are all increased as compared with those from near optimally doped samples, which requires further theoretical analysis in the future.

Keywords: underdoped Bi₂Sr₂Ca_1-xY_xCu₂O_{8+ $δ$} superconductors intrinsic Josephson junctions tunneling spectra

Received: 22 February 2010
Revised: 07 April 2010
Accepted manuscript online:

PACS:	74.50.+r	(Tunneling phenomena; Josephson effects)
	74.25.Jb	(Electronic structure (photoemission, etc.))
	74.62.Bf	(Effects of material synthesis, crystal structure, and chemical composition)
	74.62.Dh	(Effects of crystal defects, doping and substitution)
	74.72.Hs

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10974242).

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Yuan Tao(袁涛), Wang Xin-Qiang(王新强), Ren Jian-Kun(任建坤), Lin De-Hua(林德华), Tian Ye(田野), Ren Yu-Feng(任育峰), and Zhao Shi-Ping(赵士平) Tunneling spectra of underdoped Bi₂Sr₂Ca_1-xY_xCu₂O_{8+ $δ$} intrinsic Josephson junctions 2010 Chin. Phys. B 19 087402

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Tunneling spectra of underdoped Bi2Sr2Ca1-xYxCu2O8+δ intrinsic Josephson junctions

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Tunneling spectra of underdoped Bi₂Sr₂Ca_1-xY_xCu₂O_{8+ $δ$} intrinsic Josephson junctions