  The isovector and isoscalar components of neutron-proton pairing are
investigated in the N=Z unstable nuclei of the \textit{fp}-shell through the
two-nucleon transfer reaction (p,$^3$He) in inverse kinematics. The combination
of particle and gamma-ray detection with radioactive beams of $^{56}$Ni and
$^{52}$Fe, produced by fragmentation at the GANIL/LISE facility, made it
possible to carry out this study for the first time in a closed and an
open-shell nucleus in the \textit{fp}-shell. The transfer cross-sections for
ground-state to ground-state (J=0$^+$,T=1) and to the first (J=1$^+$,T=0) state
were extracted for both cases together with the transfer cross-section ratios
$\sigma$(0$^+$,T=1) /$\sigma$(1$^+$,T=0). They are compared with second-order
distorted-wave born approximation (DWBA) calculations. The enhancement of the
ground-state to ground-state pair transfer cross-section close to mid-shell, in
$^{52}$Fe, points towards a superfluid phase in the isovector channel. For the
"deuteron-like" transfer, very low cross-sections to the first (J=1$^+$,T=0)
state were observed both for \Ni\phe\, and \Fe\phe\, and are related to a
strong hindrance of this channel due to spin-orbit effect. No evidence for an
isoscalar deuteron-like condensate is observed.
