Investigation of the Superconducting Microwave Transmission Line in Strong Electromagnetic Fields

et al. 2019

Ukr. J. Phys.

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A phenomenological model has been proposed to describe the avalanche-like transition of a microwave nonlinear HTSC-based transmission line into a dissipative state. This effect was observed by the authors in a dc-biased transmission line. The proposed model generalizes the well-known phenomenological model for the nonlinear HTSC-based transmission line under the action of a direct current. The character of the dependences obtained for microwave losses allows the jump-like changes in the properties of the nonlinear HTSC-based transmission line to be regarded as a fold-type catastrophe and the methodological and mathematical apparatus of the theory of catastrophes to be used in order to explain the results obtained and predict new ones.

Section: Phenomenological Model Of the Current Flow Through An Htsc Wsupporting

confidence: 55%

Section: Preliminary Analysis Of Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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To the Phenomenological theory of Avalanche-Like Effect in Dc-Biased Microwave Nonlinear HTS Transmission Line

Melnyk

et al. 2019

Ukr. J. Phys.

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“…The appearance of steps, possibly, is due to the formation of thermal domains 15,16 and/or the manifestation of the wave reflection from the input and output of the CPW. 13 This dependence noticeably changes when different currents I dc were passed through the CPW (Fig. 3).…”

mentioning

confidence: 95%

“…12 and 13, serious obstacles were found in the implementation of practical devices: the difficulty to control the input power handling P x(in) (Ref. 12) and the lack of stability of planar transmission line to the breakdown upon the transition to a strongly dissipative condition 13 . In Ref.…”

mentioning

confidence: 99%

Direct-current-assisted microwave quenching of YBa2Cu3O7−δ coplanar waveguide to a highly dissipative state

Cherpak

Applied Physics Letters

Gubin

et al. 2014

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The paper reports on finding the effect of a strong change in the microwave losses in an HTSbased coplanar waveguide (CPW) at certain values of the input power P in and direct current I dc .CPW on the basis of 150 nm thick YBa 2 Cu 3 O 7-δ epitaxial film on a single crystal MgO substrate was studied experimentally. A sharp and reversible transition of the CPW into a strongly dissipative state at the certain meanings of P in and I dc depending on temperature was observed.Apparently the effect can be explained by self-heating of HTS structure caused by magnetic flux flow under the joint influence of MW and DC.Since discovery of high-temperature superconductors (HTS) in 1986 [1] a lot of attention has been given to studying nonlinear properties of HTS in microwave (MW) fields [2][3][4].

Catastrophe theory in the phenomenological description of the avalanche effect in dc-biased microwave HTSC transmission lines

Melnyk

Low Temperature Physics

et al. 2020

Within the framework of the proposed generalization of the phenomenological model of a microwave nonlinear HTSC transmission line, the effects of direct current on the transmission line are studied. Taking into account the next term in the expansion of the nonlinear dependence of the resistance on current allows us to explain the anomalous dependence of the insertion loss on the input power level observed in the experiment at subcritical temperatures. An additional direct current through the microwave waveguide can lead to the appearance of a bifurcation region in the space of control parameters. This is manifested in the possibility of an abrupt change in the properties of the waveguide at the boundaries of this region and the transition of the HTSC waveguide to a strongly dissipative state. The qualitative correspondence of the properties of the generalized phenomenological model to the data of experimental studies of the HTSC coplanar waveguide is obtained.