制备 p/n 型 YBa2Cu3O7-δ/Nd1.85Ce0.15CuO4 超导异质结构

Jiqiang Jia, Jingran Li, Chen Liu, Fuxue Yan, Tao Zhang, Li Lei
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引用次数: 0

摘要

由于空穴型(p 型)高温超导体(HTS)和电子型(n 型)高温超导体(HTS)的电子配对特性存在很大差异,当库珀对从 p 型进入 n 型高温超导体或从 n 型进入 p 型高温超导体时,在界面上不可避免地会发生配对调整甚至重组,由它们主导的超导电流必然会发生变化。因此,通过研究这些变化,可以更好地理解 HTS 的电子配对机制,并开发出新的 HTS 结器件。本文通过脉冲激光沉积法在(00l)取向单晶 SrTiO3 衬底上制备了 p/n 型 YBa2Cu3O7-δ/Nd1.85Ce0.15CuO4 (YBCO/NCCO)异质结构。X 射线衍射测量结果表明,在 YBCO 上制备的 NCCO 薄膜并没有表现出良好的 c 轴外延生长,而底部含有 NCCO 的 YBCO/NCCO 异质结构则获得了良好的 c 轴外延生长。由于高温氧气氛和脱氧过程的影响,双层结构的超导电学性能严重下降,使用传统的基于氧气氛的制备工艺无法获得上下层良好的超导电学性能。随后,研究人员研究了不同生长气氛对 YBCO 超导电学特性的影响,发现在氧气、氧化亚氮和氮气气氛中都能生长出高质量的 YBCO 超导薄膜。然而,氧气和一氧化二氮气氛会降低底层 NCCO 层的超导电特性,而氮气气氛似乎对其影响不大。通过低温充氧工艺,NCCO 在氧气环境中生长,YBCO 在氮气环境中生长,最终制备出了 YBCO/NCCO 超导双层层,YBCO 和 NCCO 的临界转变温度分别为 85 K 和 8 K。p/n 型 HTS 异质结构的成功制备将有助于对 HTS 的进一步研究。
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Preparation of p/n-type YBa2Cu3O7−δ/Nd1.85Ce0.15CuO4 superconducting heterostructures
Due to the great differences in electron pairing characteristics between the hole-type (p-type) high-temperature superconductor (HTS) and the electron-type (n-type) HTS, when the Cooper pairs enter from a p-type to an n-type HTS or an n-type to a p-type HTS, pairing adjustment or even the recombination of them will inevitably occur at the interface, and the superconducting current dominated by them will be bound to change. Therefore, it is possible to better understand the electron pairing mechanism of the HTS and develop new HTS junction devices by studying these changes. In this paper, p-/n-type YBa2Cu3O7−δ/Nd1.85Ce0.15CuO4 (YBCO/NCCO) heterostructures were prepared via pulsed laser deposition on (00l)-oriented single-crystal SrTiO3 substrates. X-ray diffraction measurements indicate that the NCCO films prepared on YBCO do not exhibit good c-axis epitaxial growth, while excellent c-axis epitaxial growth is obtained for YBCO/NCCO heterostructures with NCCO at the bottom. Due to the high-temperature oxygen atmosphere and the deoxygenation process, the superconducting electrical properties of the bilayer structure are seriously degraded, and it is not possible to obtain good superconducting electrical properties for both the upper and lower layers using the traditional preparation process based on an oxygen atmosphere. Subsequently, the effects of different growth atmospheres on the electrical properties of the YBCO superconductors were studied, and high-quality YBCO superconducting films could be grown in oxygen, nitrous oxide, and nitrogen atmospheres. However, the oxygen and nitrous oxide atmospheres degrade the superconducting electrical properties of the underlying NCCO layer, while the nitrogen atmosphere does not seem to affect it significantly. YBCO/NCCO superconducting bilayers with critical transition temperatures of 85 and 8 K for YBCO and NCCO, respectively, were finally prepared by growing NCCO in an oxygen atmosphere and YBCO in a nitrogen atmosphere using a low-temperature oxygenation process. The successful preparation of the p-/n-type HTS heterostructure will help further study on the HTS.
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