Abstract
We have investigated the magnetic structure of HoB 12, ErB 12 and TmB 12 by neutron diffraction on isotopically enriched single-crystalline samples. Results in zero field as well as in magnetic field up to 5 T reveal modulated incommensurate magnetic structures in these compounds. The basic reflections can be indexed with q=(1/2± δ, 1/2± δ, 1/2± δ), where δ = 0.0 3 5 both for HoB 12 and TmB 12 and with q=(3/2± δ, 1/2± δ, 1/2± δ), where δ = 0.0 3 5 , for ErB 12. In an applied magnetic field, new phases are observed. The complex magnetic structure of these materials seems to result from the interplay between the RKKY and dipole–dipole interaction. The role of frustration due to the fcc symmetry of dodecaborides and the crystalline electric field effect is also considered.
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