Determining the Thickness of the Dead Layer in Superconducting Film Using a Two-Coil Mutual-Inductance Technique

Zhang, Ruozhou; Zhao, Zhanyi; Qin, Mingyang; Xu, Juan; Cheng, Wenxin; Li, Yangmu; Chen, QiHong; Yuan, Jie; Jin, Kui

doi:10.1103/physrevapplied.17.054034

Cited by 2 publications

(2 citation statements)

References 64 publications

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“…While for the scenario that two constituents directly contact with each other, the proximity effectiveness seems to be maximal, but this may lead to an electrical short. Conversely, the interface will contain a nonsuperconducting dead layer that had been widely observed at the interface between the non-SC substrate and SC film [19][20][21][22]. This dead layer could be caused by the lowering of electron density and/or weakening of phonon coupling due to interdiffusions, strains, defects, grain boundaries, off-stoichiometries, or other growth-related factors at the interface [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Inducing superconductivity in quantum anomalous Hall regime

Huang,

Fu,

Zhang

et al. 2024

J. Phys.: Condens. Matter

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Interfacing the quantum anomalous Hall insulator with a conventional superconductor is known to be a promising manner for realizing a topological superconductor, which has been continuously pursued for years. Such a proximity route depends to a great extent on the control of the delicate interfacial coupling of the two constituents. However, a recent experiment reported the failure to reproduce such a topological superconductor, which is ascribed to the negligence of the electrical short by the superconductor in the theoretical proposal. Here, we reproduce this topological superconductor with attention to the interface control. The resulted conductance matrix under a wide magnetic field range agrees with the fingerprint of this topological superconductor. This allows us to develop a phase diagram that unveils three regions parameterized by various coupling limits, which not only supports the feasibility to fabricate the topological superconductor by proximity but also fully explains the origin of the previous debate. The present work provides a comprehensible guide on fabricating the topological superconductor.

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Section: Introductionmentioning

confidence: 99%

Inducing superconductivity in quantum anomalous Hall regime

Huang,

Fu,

Zhang

et al. 2024

J. Phys.: Condens. Matter

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“…Notably, such an in-situ measurement is critical for studying highly crystalline superconducting films that are fragile to air. Moreover, the TCMI setup can be simply constructed with high measurement sensitivity and has hence been widely used for the investigation of superconductivity in various materials [11,26,[29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Calculation of penetration depth under various numerical models for the reflection-type two-coil mutual inductance technique

Liu¹,

Yao²,

Qu³

et al. 2023

Supercond. Sci. Technol.

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The two-coil mutual inductance (TCMI) technique is a useful experimental method to derive magnetic penetration depth λ in a superconducting film after proper numerical calculations, in which various film geometries including infinite, circular and quadrangle films have been utilized. Based on previously reported reflection-type TCMI experimental data taken from NbN and K-adsorbed FeSe thin films, we investigate the validity of various numerical models with different geometries by comparing their calculation results. The calculated values of λ for various film geometries become identical only when the film size is at least three times larger than the coil size. For a rectangle film with a width comparable to the coil size, the numerical models of circular and square film geometries with proper sizes can be also adopted to obtain a similar λ value as that calculated with a rectangle film geometry. Although the true value of λ can be approximately achieved only after a complicated calibration, its calculated temperature dependence is insensitive to the choice of numerical models. With these results, a proper film geometry for the numerical calculation of λ may be selected to effectively improve the calculation efficiency.

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Determining the Thickness of the Dead Layer in Superconducting Film Using a Two-Coil Mutual-Inductance Technique

Cited by 2 publications

References 64 publications

Inducing superconductivity in quantum anomalous Hall regime

Inducing superconductivity in quantum anomalous Hall regime

Calculation of penetration depth under various numerical models for the reflection-type two-coil mutual inductance technique

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