High-precision measurement of magnetic penetration depth in superconducting films

He, X.; Gozar, A.; Sundling, R.; Božović, I.

doi:10.1063/1.4967004

Title: High-precision measurement of magnetic penetration depth in superconducting films

Journal Article · Tue Nov 01 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4967004· OSTI ID:1336172

He, X. ^[1]; Gozar, A. ^[1];

^[2]; Božović, I. ^[3]

Yale Univ., New Haven, CT (United States). Dept. of Applied Physics
Zensoft, Inc., Madison, WI (United States)
Yale Univ., New Haven, CT (United States). Dept. of Applied Physics; Brookhaven National Lab. (BNL), Upton, NY (United States)

We report that the magnetic penetration depth (λ) in thin superconducting films is usually measured by the mutual inductance technique. The accuracy of this method has been limited by uncertainties in the geometry of the solenoids and in the film position and thickness, by parasitic coupling between the coils, etc. Here, we present several improvements in the apparatus and the method. To ensure the precise thickness of the superconducting layer, we engineer the films at atomic level using atomic-layer-by-layer molecular beam epitaxy. In this way, we also eliminate secondary-phase precipitates, grain boundaries, and pinholes that are common with other deposition methods and that artificially increase the field transmission and thus the apparent λ. For better reproducibility, the thermal stability of our closed-cycle cryocooler used to control the temperature of the mutual inductance measurement has been significantly improved by inserting a custom-built thermal conductivity damper. Next, to minimize the uncertainties in the geometry, we fused a pair of small yet precisely wound coils into a single sapphire block machined to a high precision. Lastly, the sample is spring-loaded to exactly the same position with respect to the solenoids. Altogether, we can measure the absolute value of λ with the accuracy better than ±1%.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1336172

Alternate ID(s):: OSTI ID: 1331829

Report Number(s):: BNL-113152-2016-JA; RSINAK; R&D Project: KC0203020; MA209MACA

Journal Information:: Review of Scientific Instruments, Vol. 87, Issue 11; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 22 works

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Large-area borophene sheets on sacrificial Cu(111) films promoted by recrystallization from subsurface boron Wu, Rongting; Gozar, Adrian; Božović, Ivan npj Quantum Materials, Vol. 4, Issue 1 https://doi.org/10.1038/s41535-019-0181-0	journal	August 2019
Superconductivity in an infinite-layer nickelate Li, Danfeng; Lee, Kyuho; Wang, Bai Yang Nature, Vol. 572, Issue 7771 https://doi.org/10.1038/s41586-019-1496-5	journal	August 2019
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Diamagnetic Response of Potassium-Adsorbed Multilayer FeSe Film Yao, Gang; Duan, Ming-Chao; Liu, Ningning Physical Review Letters, Vol. 123, Issue 25 https://doi.org/10.1103/physrevlett.123.257001	journal	December 2019
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Scanning SQUID characterization of extremely overdoped $La_{2-x}Sr_{x}CuO_{4}$ Herrera, Chloe; Franklin, Jacob; Božović, Ivan arXiv https://doi.org/10.48550/arxiv.2101.04259	text	January 2021
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