INTERFACIAL STUDY OF TL2BA2CA2CU3O10 THIN-FILMS ON SILVER FOIL

An interfacial study of Tl2Ba2Ca2Cu3O10 thin films on silver foil has been carried out. There is a guest phase, composed of a 2.4-nm-thick u nit cell up to 10 nm thick in total, formed between the interface of t he 2223 phase and the substrate. It is fitted, with our proposed model , to Tl2CaCu2O6. This kind of guest phase in the TBCCO and silver syst em is found for the first time. This non-superconducting Tl2CaCu2O6 ph ase did not affect the superconducting property, and T(c)=102 K was fo und for this sample.