Title :
Nonlinear surface resistance in YBa/sub 2/Cu/sub 3/O/sub 7-x/ thin films
Author :
Oates, D.E. ; Nguyen, P.P. ; Dresselhaus, G. ; Dresselhaus, M.S. ; Chin, C.C.
Author_Institution :
Lincoln Lab., MIT, Lexington, MA, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
A complete characterization of the nonlinearity of the surface impedance Z/sub s/ of YBa/sub 2/Cu/sub 3/O/sub 7-x/ thin films is presented. Z/sub s/(H/sub rf/, the RF magnetic field), has been measured for H/sub rf/ from 0 to approximately 1 kOe vs. temperature from 4.2 K to critical temperature T/sub c/ and vs. frequency from 1.5 to 10 GHz, using a stripline resonator. The results are compared to a coupled-grain model. Good agreement is found for R/sub s/(H/sub rf/). The imaginary part of Z/sub s/(H/sub rf/), i.e. X/sub s/(H/sub rf/), however, does not fit the model.<>
Keywords :
barium compounds; grain size; high-temperature superconductors; magnetic field effects; sputtered coatings; superconducting thin films; surface phenomena; yttrium compounds; 1.5 to 10 GHz; 4.2 K; HTSC; RF magnetic field; YBa/sub 2/Cu/sub 3/O/sub 7-x/; grain size; off-axis sputtering; surface impedance; thin films; Distortion measurement; Electrical resistance measurement; Laboratories; Magnetic field measurement; Physics; Stripline; Superconducting microwave devices; Surface impedance; Surface resistance; Transistors;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Conference_Location :
3/1/1993 12:00:00 AM
