Magnetic Flux Penetration into Superconducting Thin Films

Peabody, Gerald E.; Meservey, R.

doi:10.1103/physrevb.6.2579

Cited by 26 publications

(3 citation statements)

References 54 publications

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“…[77] 1.45 [78] 50 ± 10 [79] 46-51 [80] 51.5 [81] In 360 100 0.11 [40] 41.1 [12] 3.378 ± 0.002 0.487 ± 0.003 experiment 0.525 [82] 1.9 [83] 40 [40] 0.541 [77] Sn nanowire 70 70 0.23 [40] 9.1 [39] 3. [77] 1.6 [83] 56-68 [84] NbN 8,900 8 40 [40] 7.9 [85] 14.37 ± 0.03 3.00 ± 0.03 2.83 ± 0.08 193. [87] 1.9± 0.1 [88] 200 [40] 194 [89] MoGe 2,000 64 80 [90] 5.8 [15] 5 [91] 1.8 [92] 400 [93] Ba 0.6 K 0.4 BiO 3 25,000 150 70 [94] 3.04 [16] 27.…”

Section: Material/refmentioning

confidence: 99%

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

2017

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Key questions for any superconductor include: what is its maximum dissipation-free electrical current (its 'critical current') and can this be used to extract fundamental thermodynamic parameters? Present models focus on depinning of magnetic vortices and implicate materials engineering to maximise pinning performance. But recently we showed that the self-field critical current for thin films is a universal property, independent of microstructure, controlled only by the penetration depth. Here we generalise this observation to include thin films, wires or nanowires of singleor multi-band s-wave and d-wave superconductors. Using extended BCS equations we consider dissipation-free self-field transport currents as London-Meissner currents, avoiding the concept of pinning altogether. We find quite generally, for type I or type II superconductors, the current is limited by the relevant critical field divided by the penetration depth. Our fits to 64 available data sets, from zinc nanowires to compressed sulphur hydride with critical temperatures of 0.65 to 203 K, respectively, are excellent. Extracted London penetration depths, superconducting energy gaps and specific heat jumps agree well with reported bulk values. For multiband or multiphase samples we accurately recover individual band contributions and phase fractions.

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Section: Material/refmentioning

confidence: 99%

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

2017

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“…50 This dependence was extended by Tinkham to the regime between clean and dirty limits later as δ = δ c 1 + ξ 0 /l at low temperature 2 (ξ 0 and δ c denote the coherence length and clean-limit penetration depth, respectively), in good agreement with the experiments. [66][67][68][69][70] This directly indicates that the Meissner supercurrent experiences a friction resistance from scattering. Nevertheless, a supercurrent should be non-viscous.…”

Section: Introductionmentioning

confidence: 99%

Gauge-invariant microscopic kinetic theory of superconductivity in response to electromagnetic fields

Yang

2018

Phys. Rev. B

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Within a gauge-invariant microscopic kinetic theory, we study the electromagnetic response in the superconducting states. Both superfluid and normal-fluid dynamics are involved. We predict that the normal fluid is present only when the excited superconducting velocity vs is larger than a threshold vL = |∆|/kF . Interestingly, with the normal fluid, we find that there exists friction between the normal-fluid and superfluid currents. Due to this friction, part of the superfluid becomes viscous. Therefore, a three-fluid model: normal fluid, non-viscous and viscous superfluids, is proposed. For the stationary magnetic response, at vs < vL with only the non-viscous superfluid, the Meissner supercurrent is excited and the gap equation can reduce to Ginzburg-Landau equation. At vs≥vL, with the normal fluid, non-viscous and viscous superfluids, in addition to the directly excited Meissner supercurrent in the superfluid, normal-fluid current is also induced through the friction drag with the viscous superfluid current. Due to the normal-fluid and viscous superfluid currents, the penetration depth is influenced by the scattering effect. In addition, a modified Ginzburg-Landau equation is proposed. We predict an exotic phase in which both the resistivity and superconducting gap are finite. As for the optical response, the excited vs oscillates with time. When vs < vL, only the non-viscous superfluid is present whereas at vs≥vL, normal fluid, non-viscous and viscous superfluids are present. We show that the excited normal-fluid current exhibits the Drude-model behavior while the superfluid current consists of the Meissner supercurrent and Bogoliubov quasiparticle current. Due to the friction between the superfluid and normal-fluid currents, the optical conductivity is captured by the three-fluid model. Finally, we also study the optical excitation of the Higgs mode. By comparing the contributions from the drive and Anderson-pseudospin pump effects, we find that the drive effect is dominant at finite temperature whereas at zero temperature, both effects contribute.

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“…Several investigators have implemented different techniques based on this phenomenon to study X(T) for various materials. Peabody and Meservey (32) used a double Josephson junction structure incorporating a dielectric to separate the superconductors whose field pen etration depth A was to be measured. They measured X(0) for lead and tin and were able to measure X(T) for one lead sample up to T = 0.6 Tg.…”

Section: Introductionmentioning

confidence: 99%

Field and temperature dependent quantum phenomena in SNS junctions

Miller

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Magnetic Flux Penetration into Superconducting Thin Films

Cited by 26 publications

References 54 publications

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

Gauge-invariant microscopic kinetic theory of superconductivity in response to electromagnetic fields

Field and temperature dependent quantum phenomena in SNS junctions

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