Abstract
Inelastic neutron scattering measurement is performed on the breathing pyrochlore antiferromagnet Ba3Yb2Zn5O11. The observed dispersionless excitations are explained on the basis of a crystalline electric field (CEF) Hamiltonian of the Kramers ion Yb3+, the local symmetry of which exhibits C3v point group symmetry. The magnetic susceptibility previously reported is consistently reproduced by the energy scheme of the CEF excitations. The obtained wave functions of the ground-state Kramers doublet exhibit planer-type anisotropy. The result demonstrates that Ba3Yb2Zn5O11 is an experimental realization of a breathing pyrochlore antiferromagnet with a pseudospin S = 1/2 having easy-plane anisotropy.
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