Effects of disorder on the microwave properties of MgB{sub 2} polycrystalline films
- Department of Physics, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin (Italy)
The role of disorder in superconducting magnesium diboride (MgB{sub 2}) policrystalline films is investigated in the high frequency range by a coplanar microwave resonator technique. Two sources of disorder are considered, heavy-ion irradiation damage and sample ageing. Microwave measurements are analyzed in the framework of the two-gap model with strong interband scattering contribution. It turns out that disorder enhancement increases the interband scattering rate, resulting in a reduction of the surface resistance at low temperatures, due to a slight increase of the {pi} gap. Moreover, increasing disorder at grain boundaries induces a nonmonotonic residual surface resistance, showing the features of a resistive behavior for the highest disorder level. Finally, the effects of the different kinds of disorder on the intrinsic and on the grain-boundary properties of the MgB{sub 2} films are compared and discussed.
- OSTI ID:
- 20853879
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 74, Issue 18; Other Information: DOI: 10.1103/PhysRevB.74.184518; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AGING
ENERGY GAP
FREQUENCY DEPENDENCE
GRAIN BOUNDARIES
HEAVY IONS
ION BEAMS
IRRADIATION
MAGNESIUM BORIDES
MICROWAVE RADIATION
PHYSICAL RADIATION EFFECTS
POLYCRYSTALS
REDUCTION
RESONATORS
SCATTERING
SURFACES
TEMPERATURE DEPENDENCE
THIN FILMS
TYPE-II SUPERCONDUCTORS