TUNNELING AND ANISOTROPIC CHARGE-TRANSPORT PROPERTIES OF SUPERCONDUCTING (110)-ORIENTED YBA2CU3O7 THIN-FILMS

We have measured the tunneling conductance of YBa2Cu3O7/Pb planar tunn el junctions fabricated on superconducting (110)-oriented YBa2Cu3O7 th in films exhibiting zero-resistance superconducting transition tempera tures (T-c's) between 88 and 89.5 K. The conductance is the same as we and other groups have measured on (100)- and (103)-oriented YBa2Cu3O7 /Pb junctions and quantitatively different from c-axis tunneling. The ab-plane transport is comparable to that measured in (001)-oriented YB a2Cu3O7 thin films, and the transport anisotropy varies between 65 and 80 from 300 K to T-c, respectively. This anisotropy is higher than th at previously measured in both (110)-oriented and c-axis aligned (100) -oriented films, but it is comparable to that measured in single cryst als. (C) 1996 American Institute of Physics.