| Intrinsic tunneling study of underdoped Bi2Sr2-xLaxCuO6+δ superconductors |
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| 引用本文： | 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 Bi2Sr2-xLaxCuO6+δ superconductors[J].中国物理 B,2011,20(11):117401-117401. |
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| 作者姓名： | 任建坤 任育峰 田野 于海峰 郑东宁 赵士平 林成天 |
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| 作者单位： | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Max-Planck-Institut für Festkö rperforschung, Heisenbergstraβe 1, D-70569 Stuttgart, Germany |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant No. 10974242) and the National Basic Research
Program of China (Grant No. 2011CBA00106). |
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| 摘 要： | We report on a tunneling study of underdoped submicron Bi2Sr2-xLaxCuO6+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 Tc = 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 Tc, which shows that the IJJs can be a useful tool for the study of the electronic properties of the La-Bi2201 cuprate superconductors.
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| 关 键 词： | Bi2Sr2-xLaxCuO6+δ intrinsic Josephson junctions tunneling spectra superconducting gap pseudogap |
| 收稿时间： | 2011-06-13 |
Intrinsic tunneling study of underdoped Bi2Sr2-xLaxCuO6+δ superconductors |
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| Ren Jian-Kun,Ren Yu-Feng,Tian Ye,Yu Hai-Feng,Zheng Dong-Ning,Zhao Shi-Ping and Lin Cheng-Tian.Intrinsic tunneling study of underdoped Bi2Sr2-xLaxCuO6+δ superconductors[J].Chinese Physics B,2011,20(11):117401-117401. |
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| Authors: | Ren Jian-Kun Ren Yu-Feng Tian Ye Yu Hai-Feng Zheng Dong-Ning Zhao Shi-Ping and Lin Cheng-Tian |
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| Affiliation: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Max-Planck-Institut für Festkö rperforschung, Heisenbergstraβe 1, D-70569 Stuttgart, Germany |
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| Abstract: | We report on a tunneling study of underdoped submicron Bi2Sr2-xLaxCuO6+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 Tc = 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 Tc, which shows that the IJJs can be a useful tool for the study of the electronic properties of the La-Bi2201 cuprate superconductors. |
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| Keywords: | Bi2Sr2-xLaxCuO6+δ intrinsic Josephson junctions tunneling spectra superconducting gap pseudogap |
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