Surface resistance due to trapped magnetic flux of superconducting lead at X band

Journal Article · Fri Jul 01 04:00:00 EDT 1983 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.332533· OSTI ID:5994692

Momose, T; Yamashita, T; Onodera, Y

The surface resistance due to trapped magnetic flux of superconducting lead at X band is described. A TM/sub 010/ mode cavity was prepared by deep drawing copper substrates and electroplating lead on the substrates. Measurements were made on the cavity at rf input power less than 3 mW. Residual surface resistance values of 0.06 and 7.4 ..mu cap omega.. were obtained. The apparent surface resistance (R(H,T)) of lead due to the trapped magnetic flux has a temperature dependence of (1-t/sup 2/)/sup -1/(1-t/sup 4/)/sup -1/2/ at t = T/T/sub c/<0.6 and a relationship is established for trapped flux field dependence, R(H,T)proportional2S/sub c/R/sub H/, where R/sub H/ is the surface resistance of lead due to trapped flux and S/sub c/ is the cross section area of the cavity to the field direction. A new equation for R/sub H/(T = 0) is given as R(H,T = 0) x (S/sub tot//2S/sub c/). The results prepared using the new equation show good agreement with the published results shown to date for superconducting lead cavities having differences in mode, structure, and frequency. To obtain R/sub res/< or =0.001 ..mu cap omega.., an ambient magnetic field should be set less than 1 mG. The field dependence of R(H,T)+R/sub res/ in the case of R/sub res/ = 7.4 ..mu cap omega.. approaches gradually to that of R/sub res/ = 0.06 ..mu cap omega.. as the field increases. A model to explain the relationship between the two cases is also described.

• Research Organization: Research Institute of Electrical Communication, Tohoku University, Sendai, Japan
• OSTI ID: 5994692
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 54:7; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
&amp; Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CAVITIES
COPPER
DATA
DEPOSITION
DRAWING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRODEPOSITION
ELECTROLYSIS
ELECTROPLATING
ELEMENTS
EQUATIONS
EXPERIMENTAL DATA
FABRICATION
FREQUENCY RANGE
GHZ RANGE
INFORMATION
LEAD
LYSIS
MAGNETIC FLUX
MATERIALS WORKING
MATHEMATICAL MODELS
METALS
NUMERICAL DATA
ORIENTATION
OSCILLATION MODES
PHYSICAL PROPERTIES
PLATING
SUPERCONDUCTIVITY
SURFACE COATING
SURFACES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
TRAPPING