Abstract
Superconducting Tl-Ba-Ca-Cu-O thin films 0.2-1.0 μm thick have been prepared on MgO(100) and SrTiO 3 (100) substrates by dc diode sputtering using a single oxide target. Films containing primarily the Tl 2 Ba 2 Ca 1 Cu 2 O 8 phase were obtained with a T c (R=0) at 102 K and a transport J c of 10 4 A/cm 2 at 90 K. For the nearly pure phase Tl 2 Ba 2 Ca 2 Cu 3 O 10 films, the T c 's (R=0) are higher at 116 K and the transport J c 's at 100 K are of 10 5 A/cm 2 . Both types of films show a strong preferred orientation with the c axis perpendicular to the film plane. The rocking curve of the Tl 2 Ba 2 Ca 2 Cu 3 O 10 films is 0.32°wide and the typical grain size is over 10 μm.