TlBaCaCuO-(2212) thin films on lanthanum aluminate and sapphire substrates for microwave filters

被引:66
作者
Schneidewind, H [1 ]
Manzel, M [1 ]
Bruchlos, G [1 ]
Kirsch, K [1 ]
机构
[1] Inst Phys High Technol, Magnet Cryoelect Div, D-07702 Jena, Germany
关键词
D O I
10.1088/0953-2048/14/4/305
中图分类号
O59 [应用物理学];
学科分类号
摘要
High-quality Tl2Ba2CaCu2O8 films for microwave filter application are prepared on both sides of 2 inch lanthanum aluminate substrates as well as on double-sided CeO2 coated r-cut sapphire substrates. The films have thicknesses as high as 1 mum in the case of lanthanum aluminate substrates. On CeO2 buffered sapphire substrates it is possible to prepare crack-free superconducting films as thick as 400 nm. For both substrate materials we reach high critical current densities of J(c) > 2 x 10(6) A cm(-2) at 77 K. The microwave surface resistances R, were measured to fall short of 100 mu Omega at 5.6 GHz and 77 K in the low-field case, comparable to the best films made of YBa2Cu3O7-x material. The films were able to tolerate high microwave power levels corresponding to magnetic field amplitudes of B-RF > 2 mT. The critical temperature exceeds 102 K. This excellent performance is maintained even after several thermal cycles. The films were used to produce four-pole band-pass filters for the C-band which were operated without any detectable loss in their transfer characteristics up to temperatures of about 85 K. This is the first time that large area (2 inch) double-sided Tl2Ba2CaCu2O8 films have been prepared on sapphire with excellent critical current density in conjunction with low surface resistance.
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页码:200 / 212
页数:13
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