Surface impedance measurements of YBa sub 2 Cu sub 3 O sub 7 minus X thin films in stripline resonators

Conference · Fri Mar 01 04:00:00 EST 1991 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6109526

Oates, D E; Anderson, A C ^[1]

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1. Massachusetts Inst. of Tech., Lexington, MA (United States). Lincoln Lab.

This paper reports on measurements of the microwave surface impedance of thin films of YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} as a function of temperature, frequency and rf magnetic field, H{sub rf}, using a stripline-resonator technique. The films were deposited in situ by single-target off-axis magnetron sputtering. The frequency range was from 0.4 to 20 GHz, the temperature range from 4.2 K to T{sub c}, and the rf magnetic field range from 0 to 30 Oe. The surface resistance R{sub S} at 4.2 K and 1.5 GHz is 4 {times} 10{sub {minus}6}{Omega}. The penetration depth is determined to be 0.167 {mu}m in the best film. In some films R{sub S} shows weak dependence on H{sub rf} before rising rapidly. These behaviors differ from those observed in bulk ceramic YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} and in unpatterned films measured in microwave cavities. However, the shape of R{sub S}(H{sub rf}) for the YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} films is similar to that of Nb and NbN films measured in the same stripline geometry. The authors discuss the effects of the current distributions in the resonator on the measured R{sub S}(H{sub rf}). The authors will also present measurements of the intermodulation products in the resonators and discuss the implications of the R{sub S} and intermodulation measurements for microwave device applications.

• OSTI ID: 6109526
• Report Number(s): CONF-900944--
• Conference Information: Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Journal Volume: 27:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
665411 -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC EQUIPMENT
EQUIPMENT
FILMS
FREQUENCY DEPENDENCE
IMPEDANCE
MAGNETIC FIELDS
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
RESONATORS
SUPERCONDUCTING FILMS
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES