Intrinsic tunneling study of underdoped Bi2Sr2-xLaxCuO6+δ superconductors

doi:10.1088/1674-1056/20/11/117401

中国物理B ›› 2011, Vol. 20 ›› Issue (11): 117401-117401.doi: 10.1088/1674-1056/20/11/117401

Intrinsic tunneling study of underdoped Bi₂Sr_2-xLa_xCuO_6+δ superconductors

任建坤¹, 任育峰¹, 田野¹, 于海峰¹, 郑东宁¹, 赵士平¹, 林成天²

(1)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; (2)Max-Planck-Institut für Festkö rperforschung, Heisenbergstraβe 1, D-70569 Stuttgart, Germany

收稿日期:2011-06-13 修回日期:2011-08-25 出版日期:2011-11-15 发布日期:2011-11-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10974242) and the National Basic Research Program of China (Grant No. 2011CBA00106).

Intrinsic tunneling study of underdoped Bi₂Sr_2-xLa_xCuO_6+δ superconductors

Ren Jian-Kun(任建坤)^a), Ren Yu-Feng(任育峰)^a), Tian Ye(田野)^a), Yu Hai-Feng(于海峰)^a), Zheng Dong-Ning(郑东宁)^a), Zhao Shi-Ping(赵士平)^a)^†, and Lin Cheng-Tian(林成天)^b)

^a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; ^b Max-Planck-Institut für Festkö rperforschung, Heisenbergstraβe 1, D-70569 Stuttgart, Germany

Received:2011-06-13 Revised:2011-08-25 Online:2011-11-15 Published:2011-11-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10974242) and the National Basic Research Program of China (Grant No. 2011CBA00106).

摘要/Abstract

摘要： We report on a tunneling study of underdoped submicron Bi₂Sr_2-xLa_xCuO_6+δ (La-Bi2201) intrinsic Josephson junctions (IJJs), whose self-heating is sufficiently suppressed. The tunneling spectra are measured from 4.2 K up to the pseudogap opening temperature of T^* = 260 K. The gap value found from the spectral peak position is about 35 meV and has a weak temperature dependence both below and above the superconducting transition temperature of T_c = 29 K. Since the superconducting gap should have a value of 10-15 meV, our results indicate that the pseudogap (～35 meV) plays an important role in the underdoped La-Bi2201 intrinsic tunneling spectroscopy down to the lowest temperature of 4.2 K. However, the contribution of the superconducting gap can be separated by normalizing the spectra to the one near and above T_c, which shows that the IJJs can be a useful tool for the study of the electronic properties of the La-Bi2201 cuprate superconductors.

关键词: Bi₂Sr_2-xLa_xCuO_6+δ intrinsic Josephson junctions, tunneling spectra, superconducting gap, pseudogap

Abstract: We report on a tunneling study of underdoped submicron Bi₂Sr_2-xLa_xCuO_6+δ (La-Bi2201) intrinsic Josephson junctions (IJJs), whose self-heating is sufficiently suppressed. The tunneling spectra are measured from 4.2 K up to the pseudogap opening temperature of T^* = 260 K. The gap value found from the spectral peak position is about 35 meV and has a weak temperature dependence both below and above the superconducting transition temperature of T_c = 29 K. Since the superconducting gap should have a value of 10-15 meV, our results indicate that the pseudogap (～35 meV) plays an important role in the underdoped La-Bi2201 intrinsic tunneling spectroscopy down to the lowest temperature of 4.2 K. However, the contribution of the superconducting gap can be separated by normalizing the spectra to the one near and above T_c, which shows that the IJJs can be a useful tool for the study of the electronic properties of the La-Bi2201 cuprate superconductors.

Key words: Bi₂Sr_2-xLa_xCuO_6+δ intrinsic Josephson junctions, tunneling spectra, superconducting gap, pseudogap

中图分类号: (Tunneling phenomena; Josephson effects)

74.50.+r

74.25.Jb (Electronic structure (photoemission, etc.)) 74.72.Gh (Hole-doped)

任建坤, 任育峰, 田野, 于海峰, 郑东宁, 赵士平, 林成天. Intrinsic tunneling study of underdoped Bi₂Sr_2-xLa_xCuO_6+δ superconductors[J]. 中国物理B, 2011, 20(11): 117401-117401.

Ren Jian-Kun(任建坤), Ren Yu-Feng(任育峰), Tian Ye(田野), Yu Hai-Feng(于海峰), Zheng Dong-Ning(郑东宁), Zhao Shi-Ping(赵士平), and Lin Cheng-Tian(林成天) . Intrinsic tunneling study of underdoped Bi₂Sr_2-xLa_xCuO_6+δ superconductors[J]. Chin. Phys. B, 2011, 20(11): 117401-117401.

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Intrinsic tunneling study of underdoped Bi₂Sr_2-xLa_xCuO_6+δ superconductors

Intrinsic tunneling study of underdoped Bi₂Sr_2-xLa_xCuO_6+δ superconductors

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