A superconducting wire includes first and second superconducting layers
disposed on one or more substrates in stacked relationship, the first
superconducting layer comprising a high temperature superconducting oxide
of a first composition and the second superconducting layer comprising a
high temperature superconducting layer of a second composition, wherein
the first and second compositions are different. The first superconductor
layer optionally includes a high temperature superconductor composition
selected to provide enhanced critical current (Ic(c)) in the presence of
magnetic fields perpendicular to surface of the superconducting layer
(H//c). The second superconductor layer optionally includes a high
temperature superconductor composition selected to provide enhanced
critical current (Ic) in the presence of magnetic fields parallel to
surface of the superconducting layer (H//ab).