Abstract
The temperature dependencies of the magnetic susceptibility χ and its anisotropy Δ χ = χ ‖ − χ ⊥ were measured for the hexagonal single crystalline TB 2 compounds ( T = Sc , Ti, Zr, Hf, V and Cr) in the temperature range 4.2–300 K. It was found that Δ χ varies strongly and nonmonotonously with the filling of the hybridized d-band, being almost temperature independent and the largest for the diborides of group 4 metals. Ab initio calculations of the electronic structure and susceptibility of the diborides provide evidence that magnetic anisotropy originates from competing Van Vleck paramagnetism and the orbital diamagnetism of conduction electrons.
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