Freestanding La2CuO4/La1.55Sr0.45CuO4 heterostructure membranes with high-TC interface superconductivity

doi:10.1088/1674-1056/adf4a3

中国物理B ›› 2025, Vol. 34 ›› Issue (10): 107301-107301.doi: 10.1088/1674-1056/adf4a3

Freestanding La₂CuO₄/La_1.55Sr_0.45CuO₄ heterostructure membranes with high-T_C interface superconductivity

Xueshan Cao(曹雪珊)¹, Chuanyu Shi(史传宇)¹, Yanzhi Wang(王彦智)¹, Meng Zhang(张蒙)¹, Jirong Sun(孙继荣)^1,2, and Yanwu Xie(谢燕武)^1,3,†

1 School of Physics, Zhejiang University, Hangzhou 310027, China;
2 Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

收稿日期:2025-04-29 修回日期:2025-06-25 接受日期:2025-07-28 出版日期:2025-09-25 发布日期:2025-10-11
通讯作者: Yanwu Xie E-mail:ywxie@zju.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 12325402 and 12074334) and the National Key R&D Program of China (Grant No. 2023YFA1406400).

Freestanding La₂CuO₄/La_1.55Sr_0.45CuO₄ heterostructure membranes with high-T_C interface superconductivity

Xueshan Cao(曹雪珊)¹, Chuanyu Shi(史传宇)¹, Yanzhi Wang(王彦智)¹, Meng Zhang(张蒙)¹, Jirong Sun(孙继荣)^1,2, and Yanwu Xie(谢燕武)^1,3,†

1 School of Physics, Zhejiang University, Hangzhou 310027, China;
2 Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

Received:2025-04-29 Revised:2025-06-25 Accepted:2025-07-28 Online:2025-09-25 Published:2025-10-11
Contact: Yanwu Xie E-mail:ywxie@zju.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 12325402 and 12074334) and the National Key R&D Program of China (Grant No. 2023YFA1406400).

1. 2025-107301-SI.pdf(708KB)

摘要/Abstract

摘要： We report the fabrication of freestanding La$_{2}$CuO$_{4}$/La$_{1.55}$Sr$_{0.45}$CuO$_{4}$ (LCO/LSCO) heterostructure membranes, which were fabricated by selectively etching water-soluble Sr$_{3}$Al$_{2}$O$_{6}$ sacrificial layers from pulsed-laser-deposited heterostructures on SrTiO$_{3}$ substrates. Transport measurements reveal that these membranes exhibit superconducting behavior with an onset temperature of approximately 19 K. Comprehensive structural characterization using x-ray diffraction and scanning transmission electron microscopy demonstrates that the membranes retain excellent crystalline quality after release. The superconducting properties remain stable following mild post-annealing treatment under vacuum. This work establishes LCO/LSCO as a promising platform for developing flexible high-temperature superconducting interfaces, opening new possibilities for the development of flexible devices.

关键词: freestanding, interfaces, superconductivity

Abstract: We report the fabrication of freestanding La$_{2}$CuO$_{4}$/La$_{1.55}$Sr$_{0.45}$CuO$_{4}$ (LCO/LSCO) heterostructure membranes, which were fabricated by selectively etching water-soluble Sr$_{3}$Al$_{2}$O$_{6}$ sacrificial layers from pulsed-laser-deposited heterostructures on SrTiO$_{3}$ substrates. Transport measurements reveal that these membranes exhibit superconducting behavior with an onset temperature of approximately 19 K. Comprehensive structural characterization using x-ray diffraction and scanning transmission electron microscopy demonstrates that the membranes retain excellent crystalline quality after release. The superconducting properties remain stable following mild post-annealing treatment under vacuum. This work establishes LCO/LSCO as a promising platform for developing flexible high-temperature superconducting interfaces, opening new possibilities for the development of flexible devices.

Key words: freestanding, interfaces, superconductivity

中图分类号: (Electronic transport in interface structures)

73.40.-c

74.72.-h (Cuprate superconductors) 81.15.-z (Methods of deposition of films and coatings; film growth and epitaxy) 74.25.F- (Transport properties)

Xueshan Cao(曹雪珊), Chuanyu Shi(史传宇), Yanzhi Wang(王彦智), Meng Zhang(张蒙), Jirong Sun(孙继荣), and Yanwu Xie(谢燕武). Freestanding La₂CuO₄/La_1.55Sr_0.45CuO₄ heterostructure membranes with high-T_C interface superconductivity[J]. 中国物理B, 2025, 34(10): 107301-107301.

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Freestanding La₂CuO₄/La_1.55Sr_0.45CuO₄ heterostructure membranes with high-T_C interface superconductivity

Freestanding La₂CuO₄/La_1.55Sr_0.45CuO₄ heterostructure membranes with high-T_C interface superconductivity

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