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Energy Spectra,g Factors and Their Pressure—Induced and /or Thermal Shifts of SrTiO3:Cr^3+ and SrTiO3:Mn^4+ I:energy Spectra and g Factors at Normal Pressure 被引量:1

Energy Spectra, g Factors and Their Pressure-Induced and/or Thermal Shifts of SrTiO3:Cr3+ and SrTiO3:Mn4+ I: Energy Spectra and g Factors at Normal Pressure
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摘要 With the strong-field scheme and cubic bases, the complete d3 energy matrix in a tctragonally distorted cubic-field has been constructed. By diagonalizing this matrix, the energy spectra of Sr TiO3 :Cr3+ and Sr TiO3 :Mn4+ at normal pressure and various temperatures have been calculated. Correspondingly, the FORTRAN program calculating the g factor of the ground state has been worked out. By using the program and the wavefunction obtained from diagonalizing the complete energy matrix, the g factors of the ground state of SrTiO3 :Cr3+ and SrTiO3 :Mn4+ at normal pressure and room temperature have been evaluated. The calculated results are in good agreement with the optical spectral and EPR experimental data. The comparison and analysis of the results of two crystals have been made. It is demonstrated that the covalency of the bonding between Mn4+ and ligands (O2 ) in SrTiO3:Mn4+ is stronger than the one of the bonding between Cr3+ and ligands (O2 ) in SrTiO3:Cr3+. It is shown that the obtained wavefunctions and values of parameters are reasonable. With the strong-field scheme and cubic bases, the complete d<SUP>3</SUP> energy matrix in a tetragonally distorted cubic-field has been constructed. By diagonalizing this matrix, the energy spectra of SrTiO<SUB>3</SUB>:Cr<SUP>3+</SUP> and SrTiO<SUB>3</SUB>:Mn<SUP>4+</SUP> at normal pressure and various temperatures have been calculated. Correspondingly, the FORTRAN program calculating the g factor of the ground state has been worked out. By using the program and the wavefunction obtained from diagonalizing the complete energy matrix, the g factors of the ground state of SrTiO<SUB>3</SUB>:Cr<SUP>3+</SUP> and SrTiO<SUB>3</SUB>:Mn<SUP>4+</SUP> at normal pressure and room temperature have been evaluated. The calculated results are in good agreement with the optical-spectral and EPR experimental data. The comparison and analysis of the results of two crystals have been made. It is demonstrated that the covalency of the bonding between Mn<SUP>4+</SUP> and ligands (O<SUP>2-</SUP>) in SrTiO<SUB>3</SUB>:Mn<SUP>4+</SUP> is stronger than the one of the bonding between Cr<SUP>3+</SUP> and ligands (O<SUP>2-</SUP>) in SrTiO<SUB>3</SUB>:Cr<SUP>3+</SUP>. It is shown that the obtained wavefunctions and values of parameters are reasonable.
出处 《Communications in Theoretical Physics》 SCIE CAS CSCD 2001年第4期491-496,共6页 理论物理通讯(英文版)
关键词 晶体物理 SrTiO3:Cr 能谱 G因子 crystal fields energy spectrum optical properties g factors covalency
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参考文献6

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