Large non-linear kinetic inductance in superconductor/normal metal bilayer films

Claassen, J. H.; Adrian, S. D.; Soulen, R. J.

doi:10.1109/77.783948

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…This was not a problem for the data reported in Ref. 5 temperatures and with low coil current. However, for applications of HTS materials, there is an interest in measurements around 77 K. Here the heating problem can be significant since the coil resistance is larger, has a fairly strong temperature dependence, and the coil current required to observe an effect is larger.…”

mentioning

confidence: 84%

“…4 The method used here to extract (J) has been described previously. 5 In brief, the penetration depth is measured using a pair of coils on a common axis positioned on opposite sides of the film. As long as the coil dimensions are sufficiently small compared to the lateral extent of the film, the mutual inductance between them can be shown [6][7][8] to be proportioanl to /sinh(d/), where d is the film thickness.…”

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confidence: 99%

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Nonlinear inductive response of high temperature superconducting films measured by the mutual inductance technique

Claassen

Booth

Beall

et al. 1999

Applied Physics Letters

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The dependence of the penetration depth λ on current density J in an unpatterned superconducting film can be measured with a pair of small coaxial coils positioned on opposite sides of the film. Mutual inductance measurements in this configuration with a direct-current (dc) current component in one of the coils provide a means to determine λ(J). It is possible to separate out the effects of heating by initially trapping a persistent current in the film. The nonlinear (current-dependent) coefficients of λ(J) measured by this “dc” technique agree well with those measured by third harmonic generation in coplanar waveguide transmission lines at 5 GHz. This nondestructure technique could be used to screen films before incorporating them into circuits sensitive to nonlinear effects.

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confidence: 84%

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confidence: 99%

Nonlinear inductive response of high temperature superconducting films measured by the mutual inductance technique

Claassen

Booth

Beall

et al. 1999

Applied Physics Letters

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“…The obtained is much larger than ഛ100 nm typically quoted for pure Nb but, considering the weak ferromagnetic nature of the NiCu overlayer, we find it to be quite reasonable. 27 In the case of our pure Nb bridges, we could obtain a photoresponse signal only by significantly increasing the incident optical power and/or maintaining the sample at a temperature very close to T c . Figure 6 presents a photoresponse wave form measured for our sample A biased with I b / I c = 0.43, the same as in the case of the sample B in Fig.…”

Section: ͑2͔͒mentioning

confidence: 99%

Layered ferromagnet/superconductor heterostructures: Nonequilibrium quasiparticle dynamics and photodetector applications

Pan

Pèpe²,

Pagliarulo³

et al. 2008

Phys. Rev. B

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Time-resolved optical pump-probe and photoimpedance studies of proximized ferromagnet/superconductor nanobilayers are presented. The weak ferromagnetic nature of an ultrathin Ni0.48Cu0.52 film makes it possible to observe the dynamics of the nonequilibrium superconductivity in NiCuNb hybrids through time-resolved measurements of a near-surface optical reflectivity change, which is generated by femtosecond optical pump pulses and discussed within a nonequilibrium two-temperature electron-heating model. We observed that the NiCu overlay significantly reduced the slow bolometric contribution present in the photoresponse of a pure Nb film, resulting in a strong enhancement of the nonequilibrium kinetic-inductive component of the transient photoimpedance, measured as an _700-ps-wide voltage waveform generated across an optically excited current-biased NiCuNb bilayer microbridge. The sensitive picosecond photoresponse makes our NiCuNb heterostructures suitable for “engineered” ultrafast superconducting photodetectors since the photoimpedance signals observed in plain Nb bridges were at least 10 ns long and were due to the light-induced simple-heating effec

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“…L. Chang is with Argonne National Laboratory, Lemont, IL 60439 USA and the University of Chicago, Chicago, IL 60637 USA (Email: clchang@kicp.uchicago.edu). efficiency [23], and to enhance the current dependence of the kinetic inductance [24], [25].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Properties of Aluminum-Based Bilayers for Kinetic Inductance Detectors

Zhang

Barry

Cecil

et al. 2023

IEEE Trans. Appl. Supercond.

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The complex conductivity of a superconducting thin film is related to the quasiparticle density, which depends on the physical temperature and can also be modified by external pair breaking with photons and phonons. This relationship forms the underlying operating principle of Kinetic Inductance Detectors (KIDs), where the detection threshold is governed by the superconducting energy gap. We investigate the electromagnetic properties of thin-film aluminum that is proximitized with either a normal metal layer of copper or a superconducting layer with a lower TC , such as iridium, in order to extend the operating range of KIDs. Using the Usadel equations along with the Nam expressions for complex conductivity, we calculate the density of states and the complex conductivity of the resulting bilayers to understand the dependence of the pair breaking threshold, surface impedance, and intrinsic quality factor of superconducting bilayers on the relative film thicknesses. The calculations and analyses provide theoretical insights in designing aluminum-based bilayer kinetic inductance detectors for detection of microwave photons and athermal phonons at the frequencies well below the pair breaking threshold of a pure aluminum film.

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Large non-linear kinetic inductance in superconductor/normal metal bilayer films

Cited by 6 publications

References 5 publications

Nonlinear inductive response of high temperature superconducting films measured by the mutual inductance technique

Nonlinear inductive response of high temperature superconducting films measured by the mutual inductance technique

Layered ferromagnet/superconductor heterostructures: Nonequilibrium quasiparticle dynamics and photodetector applications

Electromagnetic Properties of Aluminum-Based Bilayers for Kinetic Inductance Detectors

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