Effective quantum pseudospin-1/2 model for Yb pyrochlore oxides

Details Effective quantum pseudospin-1/2 model for Yb pyrochlore oxides Effective quantum pseudospin-1/2 model for Yb pyrochlore oxides

2011-01-06

arxiv.org/abs/1101.1230v1

J. Phys.: Conf. Series 320, 012065 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages including 2 figures

Scientific paper

An effective quantum pseudospin-1/2 Hamiltonian for Yb_2TM_2O_7 (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 J^z=\pm 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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