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Abstract:
C1(b) compounds with 18 valence electrons are semiconducting. It will be
shown that doping with electrons results in half-metallic ferromagnets,
similar to the case of diluted semiconductors. CoTiSb is known to be a
semiconducting C1(b) compound. Doping by Fe is expected to result in
ferromagnetic order. It was found that Ti can be replaced by up to about
10% Fe while its crystal structure still remains C1(b), which was proved
by x-ray powder diffraction. Superconducting quantum interference device
magnetometry revealed a magnetic moment of 0.32 mu(B)/unit cell at 5 K.
