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. 2018;112(18):10.1063/1.5027104.
doi: 10.1063/1.5027104.

Enhanced superconducting transition temperature in electroplated rhenium

D P Pappas  1 , D E David  2 , R E Lake  1 , M Bal  1   3 , R B Goldfarb  1 , D A Hite  1 , E Kim  4 , H-S Ku  1   3 , J L Long  1   3 , C R H McRae  1   3 , L D Pappas  2 , A Roshko  1 , J G Wen  5 , B L T Plourde  6 , I Arslan  5 , X Wu  1   3
Affiliations

Enhanced superconducting transition temperature in electroplated rhenium

D P Pappas et al. Appl Phys Lett. 2018.

Abstract

We show that electroplated Re films in multilayers with noble metals such as Cu, Au, and Pd have an enhanced superconducting critical temperature relative to previous methods of preparing Re. The dc resistance and magnetic susceptibility indicate a critical temperature of approximately 6 K. The magnetic response as a function of field at 1.8 K demonstrates type-II superconductivity, with an upper critical field on the order of 2.5 T. Critical current densities greater than 107 A/m2 were measured above liquid-helium temperature. Low-loss at radio frequency was obtained below the critical temperature for multilayers deposited onto resonators made with Cu traces on commercial circuit boards. These electroplated superconducting films can be integrated into a wide range of standard components for low-temperature electronics.

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Figures

FIG. 1.
FIG. 1.
Resistance vs. temperature. (a) Data from Refs. and show Tc(Re) from the literature, curves show data from Au/Re samples described in Table I; (b) comparison of critical behavior for Re in Cu, Au, and Pd multilayers, Samples 5–7.
FIG. 2.
FIG. 2.
Critical current Jc vs. normalized temperature t = T/Tc for as-prepared electroplated multilayer, (Au/Re) × 10/Au/PTFE, Sample 5. The inset shows two samples mounted; bottom sample with current leads soldered for high currents and voltage leads wirebonded; top sample is wirebonded on both current and voltage leads.
FIG. 3.
FIG. 3.
(a) Zero-field cooled (ZFC) and field-cooled (FC) magnetic moment as functions of increasing temperature measured in μ0H = 1.0 mT. The critical temperature is Tc = 5.4 K. (b) Magnetic hysteresis loop measured at T = 1.8 K. The initial curve with increasing field is in red. The upper critical field is μ0Hc2 ≈ 2.5 T. Flux penetration occurs below 0.4 mT.
FIG. 4.
FIG. 4.
Quality factor of Au/(Re/Au) × 10/Cu/PTFE (Sample 5) compared to bare Cu/PTFE on a grounded coplanar resonator. The inset shows a Au/Re circuit board soldered into a Au-plated Cu box connectorized with SMA ports.
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References

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