Title :
Transmittance of YBa/sub 2/Cu/sub 3/O/sub 7/ thin films in the millimeter wave region
Author :
Hangyo, M. ; Nagashima, T. ; Nagasaki, N. ; Nakashima, S. ; Enami, H. ; Murakami, Y.
Author_Institution :
Osaka Univ., Japan
fDate :
3/1/1993 12:00:00 AM
Abstract :
Temperature dependence of the transmittance of YBa/sub 2/Cu/sub 3/O/sub 7/ films on MgO substrates has been measured in the frequency range of 75-110 GHz. The transmittance was analyzed by taking account of the multiple reflection in the YBa/sub 2/Cu/sub 3/O/sub 7/ and MgO layers. Linear increase of the transmittance with temperature in the normal phase was explained by the Drude model, in which parameters (plasma frequency, relaxation time) obtained from the far-infrared measurements were used. The transmittance below T/sub c/ was analyzed by using the two-fluid model. Less steep increase of the transmittance above 50 K in the superconducting phase indicates that considerable amount of normal carriers exist even at temperatures sufficiently below T/sub c/.<>
Keywords :
barium compounds; electromagnetic wave transmission; high-temperature superconductors; superconducting thin films; yttrium compounds; 75 to 110 GHz; Drude model; MgO substrates; YBa/sub 2/Cu/sub 3/O/sub 7/ thin films; far-infrared measurements; high temperature superconductors; millimeter wave region; multiple reflection; plasma frequency; relaxation time; superconducting phase; temperature dependence; transmittance; two-fluid model; Control systems; Detectors; Electromagnetic measurements; Electromagnetic scattering; Frequency; Millimeter wave measurements; Optical films; Temperature control; Temperature dependence; Transistors;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
