  The electronic structure and the magnetism of the novel ferromagnetic
semiconductor (Ga,Fe)Sb, whose Curie temperature $T_{\rm C}$ can exceed room
temperature, were investigated by means of x-ray absorption spectroscopy (XAS),
x-ray magnetic circular dichroism (XMCD), and resonance photoemission
spectroscopy (RPES). The line-shape analyses of the XAS and XMCD spectra
suggest that the ferromagnetism is of intrinsic origin. The orbital magnetic
moments deduced using XMCD sum rules were found to be large, indicating that
there is a considerable amount of 3$d^{6}$ contribution to the ground state of
Fe. From RPES, we observed a strong dispersive Auger peak and non-dispersive
resonantly enhanced peaks in the valence-band spectra. The latter is a
fingerprint of the correlated nature of Fe 3$d$ electrons, whereas the former
indicates their itinerant nature. It was also found that the Fe 3$d$ states
have finite contribution to the DOS at the Fermi energy. These states
presumably consisting of majority-spin $p$-$d$ hybridized states or
minority-spin $e$ states would be responsible for the ferromagnetic order in
this material.
