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A simple method, fishing high-Tc superconductor thin films out of liquidnitrogen bath by a permanent magnet (field > Hc1) due to the effect of highflux pinning, has been suggested to identify films having high critical currentdensity (Jc > 106 A/cm2 at 77 K) and thus a low microwave surface resistance(Rs). We have demonstrated that a Nd-Fe-B magnet, having a maximum field of ~0.5 T, could fish out Tl-1223 superconducting thin films on LSAT substrate witha thickness of ~ 5000 Angstrong having Jc > 1 MA/cm2 (at 77 K) whereas it couldnot fish out other films with Jc < 0.1 MA/cm2 at 77 K. The fished out filmsexhibit Rs values 237 - 245 ((at 77 K and 10 GHz, which is lower than that (Rs= 317 (() of the best YBCO film at the same temperature and frequency. On theother hand, the non-fishable films show very high Rs values. This method is avery simple tool to test for high Jc and good microwave properties ofsuperconducting films of large area which otherwise require a special andexpensive tool.Comment: 5 pages including 2 figures, to be published as Rapid Commun. in  Supercond. Sci. Techno

A simple test for highJcand lowRssuperconducting thin films

A simple test for highJ_cand lowR_ssuperconducting thin films