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Magnetic excitations in infinite-layer antiferromagnetic insulator

Tomiyasu, Keisuke*; Kageyama, Hiroshi*; Lee, C.*; Whangbo, M. H.*; Tsujimoto, Yoshihiro*; Yoshimura, Kazuyoshi*; Taylor, J. W.*; Llobet, A.*; Trouw, F.*; Kakurai, Kazuhisa; Yamada, Kazuyoshi*

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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Category:Physics, Multidisciplinary

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