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

Abstract

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.

6 pages including 2 figures

References in corpus (6)

• Magnetic Pyrochlore Oxides
• Dynamically-Induced Frustration as a Route to a Quantum Spin Ice State in Tb2Ti2O7 via Virtual Crystal Field Excitations and Quantum Many-Body Effects
• Quantum fluctuations in the effective pseudospin-1/2 model for magnetic pyrochlore oxides
• Quantum Melting of Spin Ice: Emergent Cooperative Quadrupole and Chirality
• Rods of Neutron Scattering Intensity in Yb2Ti2O7: Compelling Evidence for Significant Anisotropic Exchange in a Magnetic Pyrochlore Oxide
• Ising versus XY anisotropy in frustrated R${}_2$Ti${}_2$O${}_7$ compounds as seen by polarized neutrons

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