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Freestanding La2CuO4/La1.55Sr0.45CuO4 heterostructure membranes with high-TC 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 |
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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.
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Received: 29 April 2025
Revised: 25 June 2025
Accepted manuscript online: 28 July 2025
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PACS:
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73.40.-c
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(Electronic transport in interface structures)
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74.72.-h
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(Cuprate superconductors)
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81.15.-z
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(Methods of deposition of films and coatings; film growth and epitaxy)
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74.25.F-
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(Transport properties)
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| Fund: 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). |
Corresponding Authors:
Yanwu Xie
E-mail: ywxie@zju.edu.cn
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Cite this article:
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/La1.55Sr0.45CuO4 heterostructure membranes with high-TC interface superconductivity 2025 Chin. Phys. B 34 107301
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