Superconducting stripline resonator performance

McAvoy, B.R.; Wagner, G. R.; Adam, J.D.; Talvacchio, J.; Driscoll, M.M.

doi:10.1109/20.92482

Cited by 15 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The losses of superconducting tiin films have been investigated extensively by the microwave resonator technique [1][2][3][4][5][6]. This reveals information about the losses of these films and is well suited for the optimizaton for microwave applications.…”

Section: Fldciqmentioning

confidence: 99%

Determination of the Superconductor Penetration Depth from Microwave Screening Measurements on Thin Films

Muhlhaus

Schiek

1991

21st European Microwave Conference, 1991

View full text Add to dashboard Cite

ASIRACT Experiments on the screening attenuation of YBa2Cu3O7'p thin films on different substrates have been performed in the frequency range 28-33 GHz. From these measurements, the superconductor penetration depth can be deduced, which indicates the quality of a superconducting thin film. Measured values are compared to theory and literature. flDCIQThe losses of superconducting tiin films have been investigated extensively by the microwave resonator technique [1][2][3][4][5][6]. This reveals information about the losses of these films and is well suited for the optimizaton for microwave applications. The results are, however, influenced not only by the intrinsic properties of the superconductor but also by grain boundaries and by surface impurities including normal-conducting CuO droplets. To distinguish between these influences, it is useful to introduce a measurement which is affected by a smaller variety ofeffects. The measurement ofthe screening attenuation presented in this paper is not influenced by impurities on the surface of the sample because these do not alter the attenuation to a noticeable effect. -However, the measurement is not capable to distinguish between intrinsic effects and effects due to grain boundaries because the result is averaged over the sampled area. IN33UNSIC HIQ1I FRQUENCY PROPE&TMS OF S]UffECQNDUCT,0RSThe high frequency properties of superconductors can be described by a notation which is based on the coexistence ofnormal-conducting charge cariers (electrons) and superconducting charge carriers (cooper pairs). Knowing that the latter do not cause any losses, we have 0=01 I0-j2 (1) From London's equations on the magnetic penetration depth k(T) of superconductors [7], we further have 02(2) w wrtok(T )2 Superconductors show a conductivity which depends on frequency (and temperature, of course), whereas the penetration depth is independent of frequency and also applies to static magnetic fields. Therefore, it is advisable to confine to a discussion on the penetration depth when comparing measurements carried out at different frequencies.It is instructive to compare the results to theoretical models. One of the most basic approaches to describe the temperature dependence of the conductivity is the two-fluid model by Gorter and Casimir [7]. Though it is based on thermodynamical considerations, it is what one would call a "semi-empirical" model which is justified by experiments. We have

show abstract

Section: Fldciqmentioning

confidence: 99%

Determination of the Superconductor Penetration Depth from Microwave Screening Measurements on Thin Films

Muhlhaus

Schiek

1991

21st European Microwave Conference, 1991

View full text Add to dashboard Cite

show abstract

“…We have fabricated microstrip ring resonators operating at 35 GHz from laser ablated YBCO thin films deposited on lanthanum aluminate substrate [ll]. Also, several groups have studied resonator circuits at lower frequencies [5,8,9,10]. The resonator circuits we fabricated were patterned by standard photolithography using negative photoresist and a 'wet' chemical etchant.…”

mentioning

confidence: 99%