Abstract
Inelastic neutron scattering has been employed to study in detail the low-energy crystal-field (CEF) excitations of Ho3+ in tetragonal antiferromagnetic (AF) Ho0.1Y0.9Ba2Cu3O6.13. We observe a splitting of the lowest excited Γ5 doublet atT=1.5 K. This splitting is explained as resulting from the exchange interaction with the AF subsystem of copper spins. The corresponding susceptibility at the Ho3+ site has a symmetry lower than the tetragonal one of the CEF potential and, as a result, produces the splitting. The value of the coupling between Ho3+ and Cu2+ ionsJex=2.4 meV is derived from the experimentally observed value of the splitting ΔE=0.1 meV and parameters of the AF subsystem, known from the neutron scattering experiments. Some possible consequences of the rare-earth (RE)-copper exchange are discussed, including the interaction between RE ions via the virtual exchange by spin waves.
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