Effective quantum pseudospin-1/2 model for Yb pyrochlore oxides
Abstract
An effective quantum pseudospin-1/2 Hamiltonian for Yb2TM2O7 (TM = Ti and Sn) is obtained in terms of the atomic Kramers ground doublet of the LS coupling and the crystalline electric field, which is almost described with Jz= 1/2. It is calculated microscopically as the sum of Anderson's superexchange interaction and the magnetic dipole interaction. It is found that it shows a strong exchange anisotropy.
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