Resonance Shift of ESR Lines Due to Low-Symmetric Spin Distribution in Impure Two-Dimensional Systems K2MncMg1-cF4

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  • Resonance Shift of ESR Lines Due to Low-Symmetric Spin Distribution in Impure Two-Dimensional Systems K<SUB>2</SUB>Mn<I><SUB>c</SUB></I>Mg<SUB>1−<I>c</I></SUB>F<SUB>4</SUB>
  • Resonance Shift of ESR Lines Due to Low
  • Resonance Shift of ESR Lines Due to Low-Symmetric Spin Distribution in Impure Two-Dimensional Systems K<sub>2</sub>Mn<sub><i>c</i></sub>Mg<sub>1-<i>c</i></sub>F<sub>4</sub>

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Shifts of ESR lines in impure two-dimensional magnets K2MncMg1−cF4 were investigated in X-band region at room temperature. The theory, which includes the terms arising from the two-dimensionality of spin distribution in the Kubo-Tomita theory, predicts the angular variation of sin2 θ(1+9 sin2 θ) cos 2φ or sin2 θ(3 cos2 θ−1) cos 2φ for the shifts according as all q modes or only q=0 mode in the dipolar interaction are concerned. Here, θ and φ are the polar and azimuthal angles, respectively, of the c axis with respect to a coordinate system in which an external field is along the polar axis. The shifts observed in K2Mn0.43Mg0.57F4 were explained by taking account of the dominancy of the q=0 mode and the effect of the long time tails in the spin correlation function in the impure system.

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