We present a discussion of the magnetic properties and magnetic phase
transitions of Gd72SC28 monocrystalline alloys based on experimental r
esults of the magnetization (M) and transport properties (rho, d rho/d
T, Delta rho/rho). In particular, a spin reorientation transition is o
bserved in the canted ferromagnetic phase. Using dM/dH and d(Delta rho
/rho)/dH data we have obtained the H-T magnetic phase diagram of this
particular alloy composition as a function of basal plane applied magn
etic field, H.