Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session B57: Superconductivity: Response to E&M Fields
11:30 AM–2:18 PM,
Monday, March 14, 2022
Room: Hyatt Regency Hotel -Clark
Sponsoring
Unit:
DCMP
Chair: Hikaru Ueki, Northwestern University
Abstract: B57.00009 : Superheating Field of Inhomogeneous Surface Layers in Ginzburg-Landau Theory*
1:06 PM–1:18 PM
Presenter:
Benjamin L Francis
(Brigham Young University)
Authors:
Benjamin L Francis
(Brigham Young University)
Mark K Transtrum
(Brigham Young University)
Yundi Quan
(University of Florida)
Ajinkya C Hire
(University of Florida)
Richard G Hennig
(University of Florida)
Michelle Kelley
(Cornell University)
Nathan S Sitaraman
(Cornell University)
Tomas A Arias
(Cornell University)
The performance of these cavities is limited by the ability of the superconducting surface layer to maintain the Meissner state in the presence of large magnetic fields.
In particular, superconductivity can persist in a metastable state up to what is known as the superheating field, Hsh, at which point vortices penetrate the material and dissipate energy.
Previously, the superheating field has been calculated for homogenous superconductors within Ginzburg-Landau theory.
However, it has been suggested that SRF performance may by improved by surface layers engineered to increase Hsh.
We extend previous calculations to estimate Hsh for layered superconductors using material parameters calculated from DFT.
We report on a study of the relationships between Hsh and inhomogeneous surface layers with varying profiles.
*This work was supported by the US National Science Foundation under Award OIA-1549132, the Center for Bright Beams
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