Effect of Harmonics in Nearly Commensurate Spin-Density-Wave

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概要

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• Hartree-Fock calculations for nearly commensurate spin-density-waves (SDW)are presented. The effect of harmonics in the sinusoidal SDW (SSDW) withwave number Q -0 is studied both by analytic calculations in the limit of 0+0and by numerical calculations for finite Q with a one-dimensional model ofelectrons having short range interaction. The odd harmonic SDW's, bt'ingingabout the energy gain by exchange interaction, grow as Q decreases and, as thisresult, the energy of the SSDW is connected continuously with that of the ferro-magnetic state. The even harmonic charge-density-waves, bringing about theenergy loss by Coulomb interaction, are important for finite Q but vanishesfor Q-+0. The relative stability between the SSDW and helical SOW is studied.Finally, the effect of harmonics in the SSDW with Q -K/2 (K being a reciprocallattice vector) is discussed for the sake of comparison.

• 社団法人日本物理学会の論文
• 1978-09-15

著者

• Kotani Akio

  The Research Institute For Iron Steel And Other Metals Tohoku University

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