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26 Oct 1998

Volume 73, Issue 17, pp. 2393-2529

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Microwave near-field imaging of electric fields in a superconducting microstrip resonator

Ashfaq S. Thanawalla, S. K. Dutta, C. P. Vlahacos, D. E. Steinhauer, B. J. Feenstra, Steven M. Anlage, F. C. Wellstood, and Robert B. Hammond

Appl. Phys. Lett. 73, 2491 (1998); http://dx.doi.org/10.1063/1.122492 (3 pages) | Cited 10 times

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We describe the use of a cryogenic near-field scanning microwave microscope to image microwave electric fields from superconducting and normal-metal microstrip resonators. The microscope employs an open-ended coaxial probe and operates from 77 to 300 K in the 0.01–20 GHz frequency range with a spatial resolution of about 200 μm. We describe the operation of the system and present microwave images of Cu and Tl2Ba2CaCu2O8 microstrip resonators, showing standing wave patterns at the fundamental and second harmonic frequencies. © 1998 American Institute of Physics.
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07.57.-c Infrared, submillimeter wave, microwave and radiowave instruments and equipment
85.25.Pb Superconducting infrared, submillimeter and millimeter wave detectors
84.40.Az Waveguides, transmission lines, striplines
84.37.+q Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)
07.20.Mc Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment
74.72.-h Cuprate superconductors

Magnetic field dependence of quasiparticle losses in a superconductor

J. N. Ullom, P. A. Fisher, and M. Nahum

Appl. Phys. Lett. 73, 2494 (1998); http://dx.doi.org/10.1063/1.122493 (3 pages) | Cited 7 times

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We have studied the propagation of quasiparticles in a superconducting film which is penetrated by a magnetic field. We inject quasiparticles into an Al film at 75 mK using a normal–insulator–superconductor tunnel junction and measure the flux of quasiparticles which diffuse into an adjoining thermal detector. A magnetic field applied perpendicular to the plane of the film produces regions of reduced energy gap which trap quasiparticles. We find a significant reduction in the quasiparticle flux for fields as small as 2 G and explain our measurements with a model that incorporates inelastic scattering rates in Al and the characteristics of field penetration. © 1998 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions
85.25.-j Superconducting devices
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