Model for low-field microwave absorption in granular type-II superconductors

A, Pertile; Oa, Lopez; Ha, Farach; Rj, Creswick; Cp, Poole

doi:10.1103/physrevb.52.15475

Cited by 4 publications

(6 citation statements)

References 9 publications

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“…Dissipation and radiation of microwaves of the HTSCs have been measured since their discovery. Bednorz and Muller (the very same discoverers) and Blazey and many others [34][35][36][37][38] reported the modulated microwave absorption of YBaCuO and of several other HTSC families. The basic equipment used in these studies is pretty much like the one shown in Figure 11.…”

Section: The Combined Superconducting Theory and Experiments Of Microwmentioning

confidence: 86%

“…Other salient superconducting microwave cavity applications and uses are (A) the measurement of fundamental constants through the electrodynamic response of a superconductor inside a cavity resonator [33] and (B) the measurement of superconductor losses at microwave frequencies dependent on applied magnetic fields and/or on temperature [7][8][34][35][36][37]. The actual and the potential applications, just briefly mentioned here, are a sample of many propositions that are treated at length in Refs.…”

Section: Figurementioning

confidence: 99%

“…These changes can be very small, and it is convenient to include a very selective, filtered, amplification stage, such as the technique of lock-in amplification. What is measured is the quality factor change, ΔQ = Q S − Q 0 , from the quality factor, Q 0 , from the empty cavity, and the frequency shift produced by inductive changes in the electromagnetic energy inside the cavity [35][36][37]. Remembering, the quality factor is defined as [31]: Q = (ωo) ( stored electrodynamic energy ) / ( power loss ) (8) Its inverse is 1/Q = [electromagnetic energy loss (dissipated) by the sample]/ ω 0 (total electromagnetic energy inside the empty cavity).…”

Section: Measurement Of Absorption Of Microwaves By Superconductors mentioning

confidence: 99%

“…Block A includes the fundamental theory of superconductivity and t, the main phenomena, effects, and fundamental parameters, and block B shows a commonly used experimental arrangement for measuring microwave losses by means of the technique of cavity perturbation. Here, we include a field modulation stage that can bring much more sensitivity to details of the recordings [35][36][37]. But, the modulation stage can be bypassed and record directly the microwave absorption (see orange arrows in Figure 11).…”

Section: The Combined Superconducting Theory and Experiments Of Microwmentioning

confidence: 99%

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Superconductivity and Microwaves

Zamorano¹

2020

On the Properties of Novel Superconductors

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Superconductivity conforms to a quantum, thermal, and electrodynamic set of physical phenomena of great interest by themselves. They have, also, the potential to be one clean energy source that technology is looking for. Superconductors do not allow static magnetic fields to penetrate them below a critical field, that is, Meissner effect. However, microwave magnetic fields do penetrate them already, and their energy is readily absorbed by the superconductor. High-temperature, perovskite superconductors do absorb microwave energy the most due to the presence of unpaired electron spins, fluxoid dynamics, and quasiparticle motion. We describe the fundamental physics of the interaction of the superconductors with microwaves. Experimental techniques to measure microwave absorption are presented. Experimental setups for absorption of energy are described in terms of the central quantity, Q. The measurements are analyzed in terms of irreversible energy exchange processes. The knowledge gained can inform the design of superconducting devices operating in microwave environments.

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Section: The Combined Superconducting Theory and Experiments Of Microwmentioning

confidence: 86%

Section: Figurementioning

confidence: 99%

Section: Measurement Of Absorption Of Microwaves By Superconductors mentioning

confidence: 99%

Section: The Combined Superconducting Theory and Experiments Of Microwmentioning

confidence: 99%

See 2 more Smart Citations

Superconductivity and Microwaves

Zamorano¹

2020

On the Properties of Novel Superconductors

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“…As an attempt to understand the absorption mechanism recent models have been proposed. Pertile et al [1] proposed that the microwave absorption occurs due to the interaction between the applied microwave field and the fluxons in the surface layers of the superconducting grains. Xie et al [2] studied the linearity of the microwave absorption in weak-link Josephson junctions.…”

Section: Introductionmentioning

confidence: 99%