Spin-Hamiltonian theory of orbital near-degenerate state in tetragonal field |
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Authors: | Maolu Du |
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Institution: | Department of Physics, Southwest University for Nationalities, Chengdu 610041, PR China |
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Abstract: | In this paper, a Spin-Hamiltonian theory of orbital near-degenerate state in tetragonal field is presented. For orbital doublet 2E, which is an orbital degenerate state in the cubic field and is a near-degenerate state in the tetragonal field, we obtain the cubic invariant form and the tetragonal invariant form of the Spin-Hamiltonian. In case of near-degeneracy (tetragonal splitting is very small) two additional g-factors are introduced to investigate Zeeman-splitting for tetragonal field. The two additional g-factors g2z and g2xy describe the magnetic interest between A1g and B1g states for a parallel magnetic field with z-axis and a perpendicular magnetic field with z-axis, respectively. The theory is based on the time-reversal invariant and the point-group symmetry invariant. The theoretical method can also be used for other orbital degenerate states 2S+1Γ including and Γ=T1 or T2 and can be used for other point-group symmetry. |
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Keywords: | 75 10 Dg 76 30 Fc 71 70 Cj |
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