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論文

Magnetic excitations in infinite-layer antiferromagnetic insulator

富安 啓輔*; 陰山 洋*; Lee, C.*; Whangbo, M. H.*; 辻本 吉廣*; 吉村 一良*; Taylor, J. W.*; Llobet, A.*; Trouw, F.*; 加倉井 和久; et al.

Journal of the Physical Society of Japan, 79(3), p.034707_1 - 034707_4, 2010/03

 被引用回数:16 パーセンタイル:66.37(Physics, Multidisciplinary)

The magnetic excitations of an infinite-layer antiferromagnetic insulator SrFeO$$_{2}$$ were examined by powder inelastic neutron scattering to find dispersive magnetic excitations from 15meV up to 63 meV. The scattering intensity distribution is well described by a spin wave model, confirming that the out-of-plane direct Fe...Fe exchange is comparable in strength to the in-palne Fe-O-Fe superexchange. SrFeO$$_{2}$$ shows an additional magnetic excitation mode around 30meV, which is suggestive of an orbital magnon arising from small orbital moment on Fe$$^{2+}$$ brought about by spin-orbit coupling.

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