Spin Fluctuation Theory of Intermetallic Compound MnAs
Abstract:
Magnetic properties of the NiAs-type MnAs in paramagnetic and ferromagnetic phases are studied on the basis of the spin fluctuation theory. For use in this calculation we have calculated the electronic bands by the self-consistent APW method. The results for the magnetic susceptibility and magnetic moment are found to be consistent with observations. In particular, the anomalous behavior of the susceptibility in the intermediate phase of the MnP-type structure is explained qualitatively.
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http://journals.jps.jp.sci-hub.cc/doi/abs/10.1143/JPSJ.53.735
Several authors have paid attention to the fatct that the magnetic moment per Mn atom of MnAs and MnAsx-1Px varies between the low-spin value of S=1 and the high spin value of S=2 as a function of concentration, pressure, temperature and magnetic field. This is usually called the low-spin to high-spin transition. The low-spin state appears generally in the interdiate temperature range of the MnP-type structure, whereas the high-spin appears in the low and high temperature ranges of the MnAs-type structure. Goodenough presented a theory to explain qualitatively the low-spin to high-spin transition.
Several authors have paid attention to the fatct that the magnetic moment per Mn atom of MnAs and MnAsx-1Px varies between the low-spin value of S=1 and the high spin value of S=2 as a function of concentration, pressure, temperature and magnetic field. This is usually called the low-spin to high-spin transition. The low-spin state appears generally in the interdiate temperature range of the MnP-type structure, whereas the high-spin appears in the low and high temperature ranges of the MnAs-type structure. Goodenough presented a theory to explain qualitatively the low-spin to high-spin transition.
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