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Direct observation of optical magnons in YBa2Cu3O6.2
1996
Physical Review B (Condensed Matter)
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We have used high-energy inelastic neutron scattering to detect optical magnons directly in antiferromagnetic YBa 2 Cu 3 O 6.2 . The optical magnon gap is 67Ϯ5 meV. This implies an intrabilayer superexchange constant perpendicular to the CuO 2 layers of J Ќ ϭ0.08J ʈ where J ʈ is the in-plane nearest-neighbor superexchange constant.
doi:10.1103/physrevb.53.r14741
pmid:9983344
fatcat:msb2sux44fc5rhbboe4shl2hoy