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Title: Nonlinear Meissner effect in Nb 3 Sn coplanar resonators

Journal Article · · Physical Review Research

We investigated the nonlinear Meissner effect (NLME) in Nb$$_3$$Sn thin film coplanar resonators by measuring the resonance frequency as a function of a parallel magnetic field at different temperatures. We used low rf power probing in films thinner than the London penetration depth $$\lambda(B)$$ to significantly increase the field onset of vortex penetration and measure the NLME under equilibrium conditions. Contrary to the conventional quadratic increase of $$\lambda(B)$$ with $$B$$ expected in s-wave superconductors, we observed a nearly linear increase of the penetration depth with $$B$$. We concluded that this behavior of $$\lambda(B)$$ is due to weak linked grain boundaries in our polycrystalline Nb$$_3$$Sn films, which can mimic the NLME expected in a clean d-wave superconductor.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC 100387-020; AC05-06OR23177; SC100387020; SC0010081
OSTI ID:
1846494
Alternate ID(s):
OSTI ID: 1846628; OSTI ID: 1864693
Report Number(s):
JLAB-ACC-22-3465; DOE/OR/23177-5442; PPRHAI; 013156
Journal Information:
Physical Review Research, Journal Name: Physical Review Research Vol. 4 Journal Issue: 1; ISSN 2643-1564
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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