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Theoretical modeling demonstrates that commensurable spin-density waves minimize energy across specific electron densities in chromium alloys, indicating energy gap coalescence drives the phase.
The dependence of the periodicity of the spin-density waves in antiferromagnetic metals upon the number of conduction electrons is studied theoretically. It is seen that the commensurable structure, i.e., the structure for which the wave vector q equals half a reciprocal lattice vector G, is the state of minimum energy over a finite range of electron densities. The effect, which has been observed experimentally, is essentially due to the presence of two energy gaps which coalesce into one in the commensurable state. The theory gives quantitative relationships which are in good agreement with the experimentally determined values for the chromium-rich Cr-Mn and Cr-Re alloys.
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Falicov et al. (1967) studied this question.
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