Enhancing superconductivity of ultrathin YBa2Cu3O7-δ films by capping non-superconducting oxides

doi:10.1088/1674-1056/28/6/067402

中国物理B ›› 2019, Vol. 28 ›› Issue (6): 67402-067402.doi: 10.1088/1674-1056/28/6/067402

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Enhancing superconductivity of ultrathin YBa₂Cu₃O_7-δ films by capping non-superconducting oxides

Hai Bo(薄海), Tianshuang Ren(任天爽), Zheng Chen(陈峥), Meng Zhang(张蒙), Yanwu Xie(谢燕武)

1 Interdisciplinary Center of Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Device, and Department of Physics, Zhejiang University, Hangzhou 310027, China;
2 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

收稿日期:2019-02-21 修回日期:2019-04-05 出版日期:2019-06-05 发布日期:2019-06-05
通讯作者: Yanwu Xie E-mail:ywxie@zju.edu.cn
基金资助:
Project supported by the National Key Research and Development Program of the Ministry of Science and Technology of China (Grants Nos. 2017YFA0303002 and 2016YFA0300204) and the Fundamental Research Funds for the Central Universities, China.

Enhancing superconductivity of ultrathin YBa₂Cu₃O_7-δ films by capping non-superconducting oxides

Hai Bo(薄海)¹, Tianshuang Ren(任天爽)¹, Zheng Chen(陈峥)¹, Meng Zhang(张蒙)¹, Yanwu Xie(谢燕武)^1,2

1 Interdisciplinary Center of Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Device, and Department of Physics, Zhejiang University, Hangzhou 310027, China;
2 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

Received:2019-02-21 Revised:2019-04-05 Online:2019-06-05 Published:2019-06-05
Contact: Yanwu Xie E-mail:ywxie@zju.edu.cn
Supported by:
Project supported by the National Key Research and Development Program of the Ministry of Science and Technology of China (Grants Nos. 2017YFA0303002 and 2016YFA0300204) and the Fundamental Research Funds for the Central Universities, China.

摘要/Abstract

摘要：

In this study, we have explored the ways to fabricate and optimize high-quality ultrathin YBa₂Cu₃O_7-δ (YBCO) films grown on single-crystal (001) SrTiO₃ substrates. Nearly atomic-flat YBCO films are obtained by pulsed laser deposition. Our result shows that the termination of SrTiO₃ has only a negligible effect on the properties of YBCO. In contrast, we found that capping a non-superconducting oxide layer can generally enhance the superconductivity of YBCO. PrBa₂Cu₃O₇, La₂CuO₄, LaMnO₃, SrTiO₃, and LaAlO₃ have been examined as capping layers, and the minimum thickness of superconducting YBCO with capping is~2 unit cells-3 unit cells. This result might be useful in constructing good-performance YBCO-based field effect devices.

关键词: YBa₂Cu₃O_7-δ (YBCO), superconductivity, oxides, film

Abstract:

Key words: YBa₂Cu₃O_7-δ (YBCO), superconductivity, oxides, film

中图分类号: (Cuprate superconductors)

74.72.-h

74.78.-w (Superconducting films and low-dimensional structures)

薄海, 任天爽, 陈峥, 张蒙, 谢燕武. Enhancing superconductivity of ultrathin YBa₂Cu₃O_7-δ films by capping non-superconducting oxides[J]. 中国物理B, 2019, 28(6): 67402-067402.

Hai Bo(薄海), Tianshuang Ren(任天爽), Zheng Chen(陈峥), Meng Zhang(张蒙), Yanwu Xie(谢燕武). Enhancing superconductivity of ultrathin YBa₂Cu₃O_7-δ films by capping non-superconducting oxides[J]. Chin. Phys. B, 2019, 28(6): 67402-067402.

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Enhancing superconductivity of ultrathin YBa₂Cu₃O_7-δ films by capping non-superconducting oxides

Enhancing superconductivity of ultrathin YBa₂Cu₃O_7-δ films by capping non-superconducting oxides

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