Abstract
The magnetic ordering and thermal lattice expansion of nanocrystaline chromium (n-Cr) are studied by neutron powder diffraction. Nanocrystalline Cr with a volume-averaged crystallite size of 27 nm has been obtained by electrodeposition. Between room temperature and 240 K there is a simple antiferromagnetic ordering. At 240 K the magnetic ordering changes and a part of the material adopts a transverse spin-density-wave (TSDW) ordering. The spin-flip transition from the TSDW to the longitudinal LSDW ordering is supressed and about 40% of the volume has the TSDW ordering stabilized down to 2 K. The thermal lattice expansion of the material becomes negative around the magnetic phase transition near 240 K. The values of the magnetic moments of the simple antiferromagnetic and TSDW orderings observed at 2 K are in agreement with the magnetic moments observed in single crystals and polycrystalline Cr.
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