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Title: Evidence for current suppression in superconductor–superconductor bilayers

Abstract

Superconducting radio frequency (SRF) cavities, which are critical components in many particle accelerators, need to be operated in the Meissner state to avoid strong dissipation from magnetic vortices. For a defect-free superconductor, the maximum attainable magnetic field for operation is set by the superheating field, Bsh, which directly depends on the surface current. In heterostructures composed of different superconductors, the current in each layer depends not only on the properties of the individual material, but also on the electromagnetic response of the adjacent layers through boundary conditions at the interfaces. Three prototypical bilayers [Nb1–xTixN (50 nm)/Nb, Nb1–xTixN (80 nm)/Nb, and, Nb1–xTixN (160 nm)/Nb] are investigated here by depth-resolved measurements of their Meissner screening profiles using low energy muon spin rotation (LE-µSR). From fits to a model based on London theory (with appropriate boundary and continuity conditions), a magnetic penetration depth for the thin Nb1–xTixN layers of λNb1–xTixN = 182.5(31) nm is found, in good agreement with literature values for the bulk alloy. Using the measured λNb1–xTixN, the maximum vortex-free field, Bmax, of the superconductor-superconductor (SS) bilayer structure was estimated to be 610(40) mT. The strong suppression of the surface current in the Nb1–xTixN layer suggests an optimal thickness of ~more » 1.4λNb1–xTixN = 261(14) nm.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [2];  [3];  [3];  [3]; ORCiD logo [1]
  1. Univ. of Victoria, BC (Canada); TRIUMF, Vancouver, BC (Canada)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
2281804
Report Number(s):
JLAB-ACC-23-3798; DOE/OR/23177-6103
Journal ID: ISSN 0953-2048
Grant/Contract Number:  
AC05-06OR23177
Resource Type:
Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 37; Journal Issue: 2; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; penetration depth; Meissner effect; muon spin relaxation & rotation; type II superconductors; current suppression; superconductor-superconductor (SS); Nb1-xTixNb/Nb

Citation Formats

Asaduzzaman, Md, McFadden, Ryan M. L., Valente-Feliciano, Anne-Marie, Beverstock, David R., Suter, Andreas, Salman, Zaher, Prokscha, Thomas, and Junginger, Tobias. Evidence for current suppression in superconductor–superconductor bilayers. United States: N. p., 2023. Web. doi:10.1088/1361-6668/ad1462.
Asaduzzaman, Md, McFadden, Ryan M. L., Valente-Feliciano, Anne-Marie, Beverstock, David R., Suter, Andreas, Salman, Zaher, Prokscha, Thomas, & Junginger, Tobias. Evidence for current suppression in superconductor–superconductor bilayers. United States. https://doi.org/10.1088/1361-6668/ad1462
Asaduzzaman, Md, McFadden, Ryan M. L., Valente-Feliciano, Anne-Marie, Beverstock, David R., Suter, Andreas, Salman, Zaher, Prokscha, Thomas, and Junginger, Tobias. Wed . "Evidence for current suppression in superconductor–superconductor bilayers". United States. https://doi.org/10.1088/1361-6668/ad1462. https://www.osti.gov/servlets/purl/2281804.
@article{osti_2281804,
title = {Evidence for current suppression in superconductor–superconductor bilayers},
author = {Asaduzzaman, Md and McFadden, Ryan M. L. and Valente-Feliciano, Anne-Marie and Beverstock, David R. and Suter, Andreas and Salman, Zaher and Prokscha, Thomas and Junginger, Tobias},
abstractNote = {Superconducting radio frequency (SRF) cavities, which are critical components in many particle accelerators, need to be operated in the Meissner state to avoid strong dissipation from magnetic vortices. For a defect-free superconductor, the maximum attainable magnetic field for operation is set by the superheating field, Bsh, which directly depends on the surface current. In heterostructures composed of different superconductors, the current in each layer depends not only on the properties of the individual material, but also on the electromagnetic response of the adjacent layers through boundary conditions at the interfaces. Three prototypical bilayers [Nb1–xTixN (50 nm)/Nb, Nb1–xTixN (80 nm)/Nb, and, Nb1–xTixN (160 nm)/Nb] are investigated here by depth-resolved measurements of their Meissner screening profiles using low energy muon spin rotation (LE-µSR). From fits to a model based on London theory (with appropriate boundary and continuity conditions), a magnetic penetration depth for the thin Nb1–xTixN layers of λNb1–xTixN = 182.5(31) nm is found, in good agreement with literature values for the bulk alloy. Using the measured λNb1–xTixN, the maximum vortex-free field, Bmax, of the superconductor-superconductor (SS) bilayer structure was estimated to be 610(40) mT. The strong suppression of the surface current in the Nb1–xTixN layer suggests an optimal thickness of ~ 1.4λNb1–xTixN = 261(14) nm.},
doi = {10.1088/1361-6668/ad1462},
journal = {Superconductor Science and Technology},
number = 2,
volume = 37,
place = {United States},
year = {Wed Dec 27 00:00:00 EST 2023},
month = {Wed Dec 27 00:00:00 EST 2023}
}

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