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

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

Abstract

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.

Keywords: YBa₂Cu₃O_7-δ (YBCO) superconductivity oxides film

Received: 21 February 2019
Revised: 05 April 2019
Accepted manuscript online:

PACS:	74.72.-h	(Cuprate superconductors)
	74.78.-w	(Superconducting films and low-dimensional structures)

Fund:

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.

Corresponding Authors: Yanwu Xie
E-mail: ywxie@zju.edu.cn

Cite this article:

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 2019 Chin. Phys. B 28 067402

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

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