Evidence for multiband superconductivity in the heavy fermion compound UNi2Al3 -: art. no. 097001

Epitaxial thin films of the heavy fermion superconductor UNi2Al3 with T-c(max)=0.98 K were investigated. The transition temperature T-c depends on the current direction which can be related to superconducting gaps opening at different temperatures. Also the influence of the magnetic ordering at T(N)similar or equal to5 K on R(T) is strongly anisotropic, indicating different coupling between the magnetic moments and itinerant charge carriers on the multisheeted Fermi surface. The upper critical field H-c2(T) suggests an unconventional spin-singlet superconducting state.