Phase transition of chromium at TN
- 1 September 1977
- journal article
- Published by IOP Publishing in Journal of Physics F: Metal Physics
- Vol. 7 (9) , 1705-1713
- https://doi.org/10.1088/0305-4608/7/9/015
Abstract
Chromium is an itinerant-electron antiferromagnet with wavelength incommensurate to any multiple of the period of the host lattice. The appropriate statistical Hamiltonian for fluctuations above the Neel temperature is derived. This itinerant-electron Hamiltonian differs considerably from a localised-spin Hamiltonian due to the presence of a free phase angle analogous to the case for fluctuations in a superconductor, and because interactions occur only among fluctuations which all have the same spin direction. The itinerant-electron statistical Hamiltonian has a stable fixed point in the recursion relations of a Wilson-Fisher in expansion, indicating a second-order phase transition at TN. The stable fixed-point Hamiltonian corresponds to the experimentally observed single Q condensate state of chromium.Keywords
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