Phonon engineering in proximity enhanced superconductor heterostructures

Tang, Yongchao; Kwon, Sangil; Mohebbi, Hamid Reza; Cory, David G.; Miao, Guo‐Xing

doi:10.1038/s41598-017-04057-1

Cited by 3 publications

(2 citation statements)

References 31 publications

(34 reference statements)

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“…This is the same resonator discussed in Refs. [24,25]. The details of the film growth conditions are reported in Ref.…”

Section: Methodsmentioning

confidence: 99%

Magnetic hysteresis of a superconducting microstrip resonator with a high edge barrier

Kwon¹,

Tang²,

Mohebbi³

et al. 2018

Preprint

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We investigate the magnetic hysteresis of a superconducting microstrip resonator with a high edge barrier. We measure the magnetic hysteresis while either sweeping a magnetic field or tuning the edge barrier by high microwave current. We show that the magnetic hysteresis of such a device is qualitatively different from that of one without an edge barrier and can be understood based on the generalized critical-state model. In particular, we propose and demonstrate a simple and intuitive method that relies on a plot of the quality factor versus the resonance frequency for revealing the physical processes behind those hysteretic behaviors. Based on this, we find that the interplay between the Meisser current and vortex pinning is essential for understanding the magnetic hysteresis of such a device.

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“…This is the same resonator discussed in Refs. [24,25]. The details of the film growth conditions are reported in Ref.…”

Section: Methodsmentioning

confidence: 99%

Magnetic hysteresis of a superconducting microstrip resonator with a high edge barrier

Kwon¹,

Tang²,

Mohebbi³

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Maintaining a high quality factor is not straightforward in a magnetic field because of magnetic field depena) Electronic mail: kwon2866@gmail.com dent microwave losses. [36][37][38][39][40][41][42][43][44][45][46][47][48][49] The focus of this paper is to develop experimental methods to understand and characterize the magnetic field dependent loss mechanisms, quasiparticle generation and current-induced motion of vortices.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field dependent microwave losses in superconducting niobium microstrip resonators

Kwon

Roudsari

Benningshof

et al. 2018

Journal of Applied Physics

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We describe an experimental protocol to characterize magnetic field dependent microwave losses in superconducting niobium microstrip resonators. Our approach provides a unified view that covers two well-known magnetic field dependent loss mechanisms: quasiparticle generation and vortex motion. We find that quasiparticle generation is the dominant loss mechanism for parallel magnetic fields. For perpendicular fields, the dominant loss mechanism is vortex motion or switches from quasiparticle generation to vortex motion, depending on cooling procedures. In particular, we introduce a plot of the quality factor versus the resonance frequency as a general method for identifying the dominant loss mechanism. We calculate the expected resonance frequency and the quality factor as a function of the magnetic field by modeling the complex resistivity. Key parameters characterizing microwave loss are estimated from comparisons of the observed and expected resonator properties. Based on these key parameters, we find a niobium resonator whose thickness is similar to its penetration depth is the best choice for X-band electron spin resonance applications. Finally, we detect partial release of the Meissner current at the vortex penetration field, suggesting that the interaction between vortices and the Meissner current near the edges is essential to understand the magnetic field dependence of the resonator properties.

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Engineering nonlinear response of superconducting niobium microstrip resonators via aluminum cladding

Kwon

Tang

Mohebbi³

et al. 2019

Journal of Applied Physics

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In this work, we find that Al cladding on Nb microstrip resonators is an efficient way to suppress nonlinear responses induced by local Joule heating, resulting in improved microwave power handling capability. This improvement is likely due to the proximity effect between the Al and the Nb layers. The proximity effect is found to be controllable by tuning the thickness of the Al layer. We show that improving the film quality is also helpful as it enhances the microwave critical current density, but it cannot eliminate the local heating.

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Phonon engineering in proximity enhanced superconductor heterostructures

Cited by 3 publications

References 31 publications

Magnetic hysteresis of a superconducting microstrip resonator with a high edge barrier

Magnetic hysteresis of a superconducting microstrip resonator with a high edge barrier

Magnetic field dependent microwave losses in superconducting niobium microstrip resonators

Engineering nonlinear response of superconducting niobium microstrip resonators via aluminum cladding

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