Neel Temperature of the Spin Density Wave in Chromium and Its Alloys

概要

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The Neel temperature, T_N, where the energy gap, g, tends to zero is calculated. A flow of electrons between the octahedral Fermi surfaces of the electron and hole bands and the other free Fermi surfaces (called the reservoir) is taken into account. It is shown that the Fermi energy depends appreciably on temperature due to the flow of electrons, so that the calculated T_N is different from that given in a previous paper where the temperature-dependence of the Fermi energy neglected. However, the overall agreement with experimental results is found still satisfactory. The order of the phase transition is studied by calculating dg^2/dT at T_N. It is found that although dg^2/dT changes considerably with the density of states of the reservoir, this change is not large enough to bring out first-order transition. Finally, a comment is made on a related theory proposed by Mitsudo et al.
社団法人日本物理学会の論文
1970-07-05