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In Cr-doped MgAl2O4 most of the Cr3+-ions occupy normal B-sites. In addition to this axial center we report here the presence of an orthorhombic Cr3+-center. The ESR-spectra of this new center can be described by the spin Hamiltonian:, with S=3/2. The principal axes of the center are along [111]=Z, and . The values of the parameters are: gz=1·950±0·005, gx=gy=1·915±0·015, D=+0·903cm?1±0·003 cm?1 and E=+0·084 cm?1±0·005 cm?1. The intensity of the lines is about ten times lower than that of the axial Cr3+-center. 相似文献
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Considering the constraints from the experimental data on μ→eγ, μ→3e, μ–e conversion, etc., we analyze the lepton flavor violating decays ?(J/Ψ,?(1S))→e+μ−(μ+τ−) in the scenarios of the minimal supersymmetric extensions of Standard Model with seesaw mechanism. Numerically, there is parameter space that the LFV processes of J/Ψ(?)→μ+τ− can reach the upper experimental bounds, meanwhile the theoretical predictions on μ→eγ, μ→3e, μ–e conversion satisfy the present experimental bounds. For searching of new physics, lepton flavor violating processes J/Ψ(?)→μ+τ− may be more promising and effective channels. 相似文献
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