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- W1968230053 abstract "In the cubic phase of boracite ${mathrm{Cu}}_{3}{mathrm{B}}_{7}{mathrm{O}}_{13}mathrm{Br}$ (symmetry class ${T}_{d})$ the anisotropy and dispersion of nonreciprocal linear dichroism (ND) and nonreciprocal linear birefringence (NB) have been studied. The two magnetic-field-induced effects belong to the class of spatial dispersion phenomena. They have been observed near to the two strong absorption bands at the photon energies ${E}_{01}=1.5mathrm{eV}$ and ${E}_{02}=1.2mathrm{eV}.$ ${E}_{01}$ and ${E}_{02}$ are assigned to electronic transitions from the singlet ground state ${}^{2}{mathrm{B}}_{2}$ to states of the doublet ${}^{2}E.$ The analysis of dispersion of ND and NB is based on the crystal-field theory whereby spin-orbit coupling and Zeeman interaction have been included. An adequate description is obtainable only if the symmetry of the crystal field at ${mathrm{Cu}}^{2+}$ ions is lower than tetragonal. Two mechanisms are discussed as the origin of symmetry reduction. At first, a structural disorder of halogen and/or metal ions in the boracite crystal lattice produces low-symmetry components of the crystal field and these components split the excited state ${}^{2}E.$ Second, symmetry is reduced by the dynamic Jahn-Teller effect." @default.
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- W1968230053 date "2003-11-20" @default.
- W1968230053 modified "2023-09-26" @default.
- W1968230053 title "Second-order magnetoelectric susceptibility in the optical region: The case of boraciteCu3B7O13Br" @default.
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- W1968230053 doi "https://doi.org/10.1103/physrevb.68.195114" @default.
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