DC magnetic field dependence of the surface impedance in superconducting parallel plate transmission line resonators

Pambianchi, Michael S.; Wu, Dong Ho; Ganapathi, L.; Anlage, Steven M.

doi:10.1109/77.233506

Cited by 52 publications

(27 citation statements)

References 15 publications

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“…[1][2][3] Pinning by material disorder plays a vital role in determining the static as well as the dynamic behavior of vortices. 4 -7 Experiments such as magnetic susceptibility, surface impedance, 8,9 and vibrating reed 10,11 have a common feature that a small ac field interacts with the vortices that have penetrated the samples. Towards this end ac susceptibility measurements [12][13][14] have been extensively used to understand the dynamics of the vortex lattice.…”

Section: Introductionmentioning

confidence: 99%

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
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We have investigated the dynamics of vortices at subcritical microwave currents in dc magnetic fields ͑up to 0.8 T͒ in epitaxial DyBa 2 Cu 3 O 7Ϫ␦ ͑DBCO͒ thin films. Microwave measurements were performed using microstrip resonators as test vehicles at 4.88 GHz and 9.55 GHz on laser ablated DBCO thin films in the thickness range 1800-3800 Å. Experimental evidence indicates that the peak effect ͑PE͒ observed in surface resistance vs temperature (R s vs T) plots in applied dc magnetic fields up to 0.8 T is primarily due to the extended defects in thinner films ͑1800 Å͒ such as twin boundaries at the substrate(LaAlO 3 )-film interface; whereas, the high density of point defect disorder in thicker (у3000 Å) films is responsible for low R s and high depinning frequency p . This has been confirmed by generation of columnar defects using 200 MeV Ag ion irradiation which showed that even thicker DBCO films show PE in R s after the introduction of columnar defects. Further, DBCO films grown on low-twinned LaAlO 3 substrates ͑which cause low density of substrate-related extended defects in the film͒ have shown PE only

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Section: Introductionmentioning

confidence: 99%

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
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show abstract

“…Given that σ 2 is orders of magnitude larger than σ 1 in the superconducting state (due to the small value of the penetration depth, λ, with respect to sample thickness), the surface impedance measurement is less sensitive to changes in σ 1 (Refs. [21][22][23][24][25]. The effects of σ 1 and σ 2 are decoupled for fine grains; for a sample placed in a microwave cavity, the loss is due to σ 1 , whereas the resonance shift is due to σ 2 (Refs.…”

Section: Introductionmentioning

confidence: 99%

Giant microwave absorption in fine powders of superconductors

Csősz

Márkus

Jànossy

et al. 2018

Sci Rep

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Enhanced microwave absorption, larger than that in the normal state, is observed in fine grains of type-II superconductors (MgB2 and K3C60) for magnetic fields as small as a few % of the upper critical field. The effect is predicted by the theory of vortex motion in type-II superconductors, however its direct observation has been elusive due to skin-depth limitations; conventional microwave absorption studies employ larger samples where the microwave magnetic field exclusion significantly lowers the absorption. We show that the enhancement is observable in grains smaller than the penetration depth. A quantitative analysis on K3C60 in the framework of the Coffey–Clem (CC) theory explains well the temperature dependence of the microwave absorption and also allows to determine the vortex pinning force constant.

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“…Planar transmission lines have been fabricated to explore the magnetic field dependence of microwave surface impedance in the mixed state. 4,5 The measured surface impedance enables us to obtain some microscopic vortex dynamical parameters such as the viscosity and pinning force constant as well.…”

Section: Introductionmentioning

confidence: 99%

Tunable microwave characteristics of a superconducting planar transmission line by using a nonlinear dielectric thin film

2000

Journal of Applied Physics

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A field solution for a planar type-II superconducting transmission line made of two high-temperature superconducting films and a nonlinear dielectric thin film is derived. The combined effects of the nonlinear dielectric permittivity as well as of vortices inside the superconductors on the attenuation constant and phase velocity are numerically investigated. Variation in temperature-dependent phase velocity due to the dielectric nonlinearity is lowered pronouncedly in the presence of vortices. In addition, variation in phase velocity versus dc electric field is also reduced in the case of more vortices. The role played by the nonlinear dielectric as well as the vortices in such a tunable microwave component are thus demonstrated.

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DC magnetic field dependence of the surface impedance in superconducting parallel plate transmission line resonators

Cited by 52 publications

References 15 publications

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
View full text Add to dashboard Cite

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
View full text Add to dashboard Cite

Giant microwave absorption in fine powders of superconductors

Tunable microwave characteristics of a superconducting planar transmission line by using a nonlinear dielectric thin film

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DC magnetic field dependence of the surface impedance in superconducting parallel plate transmission line resonators

Cited by 52 publications

References 15 publications

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3OBanerjee1, Bagwe2, John3 et al. 2004Phys. Rev. B10150View full textAdd to dashboardCite

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3OBanerjee1, Bagwe2, John3 et al. 2004Phys. Rev. B10150View full textAdd to dashboardCite

Giant microwave absorption in fine powders of superconductors

Tunable microwave characteristics of a superconducting planar transmission line by using a nonlinear dielectric thin film

Contact Info

Product

Resources

About

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
View full text Add to dashboard Cite

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
View full text Add to dashboard Cite