Direct observation of optical magnons in Y ${Ba}_{2}$ ${Cu}_{3}$ $O_{6.2}$

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1 June 1996

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 53 (22) , R14741-R14744
https://doi.org/10.1103/physrevb.53.r14741

Abstract

We have used high-energy inelastic neutron scattering to detect optical magnons directly in antiferromagnetic Y

{Ba}_{2}

{Cu}_{3}

O_{6.2}

. The optical magnon gap is 67±5 meV. This implies an intrabilayer superexchange constant perpendicular to the Cu

O_{2}

layers of

J_{⊥} = 0.08 J_{∥}

where

J_{∥}

is the in-plane nearest-neighbor superexchange constant.

Keywords

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