Effect of microwave-enhanced superconductivity in YBa{sub 2}Cu{sub 3}O{sub 7} bi-crystalline grain boundary weak-links

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:121656

Fu, C M; Chen, C M; Lin, H C ^[1]

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1. National Chiao-Tung Univ., Taiwan (China); and others

We have studied systematically the effect of microwave irradiation on the temperature dependent resistivity R(T) and the current-voltage (I-V) characteristics of YBa{sub 2}Cu{sub 3}O{sub 7-x} (YBCO) bicrystalline grain boundary weak-links (GBWLs), with grain boundary of three different tilt angles. The superconducting transition temperature, T{sub c}, has significant enhancement upon microwave irradiation. The microwave enhanced T{sub c} is increased as a function of incidence microwave power, but limited to an optimum power level. The GBWLs of 45{degrees} tilt boundary has shown to be most sensitive to the microwave irradiation power, and the GBWLs of 36.8{degrees} tilt boundary has displayed a moderate response. In contrast, no enhancement of T{sub c} was observed in the GBWLs of 24{degrees} tilt boundary, as well as in the uniform films. Under the microwave irradiation, the R(T) dependence is hysteretic as the transition taken from superconducting state to normal state and vice versa. Mechanisms associated with the redistribution of nonequilibrium quasiparticles under microwave irradiation are discussed.

• Research Organization: National Aeronautics and Space Administration, Washington, DC (United States); National Aeronautics and Space Administration, Houston, TX (United States). Lyndon B. Johnson Space Center
• OSTI ID: 121656
• Report Number(s): CONF-940627--Vol.2; ON: TI95017155
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
COPPER OXIDES
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
MICROWAVE RADIATION
PHYSICAL RADIATION EFFECTS
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS