Magnetooptics of non-Kramers Eu3+ ions in garnets:analysis complemented by crystal-field splitting modeling calculations
来源期刊：JOURNAL OF RARE EARTHS2013年第9期
论文作者：Uygun V.Valiev John B.Gruber Anvar K.Mukhammadiev Vasiliy O.Pelenovich 付德君 Gary W.Burdick
文章页码：837 - 842
摘 要：Spectra of absorption,luminescence,magnetic circular dichroism（MCD）,and magnetic circular polarization of luminescence（MCPL） in Gd3 Ga5 O12 :Eu3+and Eu3 Ga5 O12 garnets were studied within the visible spectral range at 300 K.Analysis of the spectral and temperature dependences of the magnetooptical and optical spectra made it possible to identify the magneto-dipole（MD） and electro-dipole（ED） 4f→4f transitions occurring between Stark sublevels of the7FJ（J=1,2） and5D0 multiplets in Eu3+-containing garnet structures.Quantum mechanical "mixing" had significant influence on quasi-degenerate states of the non-Kramers rare-earth Eu3+ion for Eu3 Ga5 O12 in MCD due to forbidden MD transition7F1 →5D0 and for Gd3 Ga5 O12 :Eu3+in MCPL due to MD 4f→4f transition5D0 →7F1 and forced ED-transition5D0 →7F2.A parameterized Hamiltonian defined to operate within the entire 4f（6）ground electronic configuration of Eu3+ion was used to model the experimental Stark levels,including their irreducible representations and wavefunctions.The crystal-field parameters were determined through a Monte-Carlo method in which nine independent crystal-field parameters,Bk q,were given random starting values and optimized using standard least-squares fitting between calculated and experimental levels.The final fitting standard deviation between 57 calculated-to-experimental levels was 0.73 meV.
Uygun V.Valiev1，John B.Gruber2，Anvar K.Mukhammadiev1，Vasiliy O.Pelenovich3，付德君3，Gary W.Burdick4
1. Faculty of Physics,National University of Uzbekistan2. Department of Physics and Astronomy,The University of Texas at San Antonio3. School of Physics and Technology,Wuhan University4. Department of Physics,Andrews University
摘 要：Spectra of absorption,luminescence,magnetic circular dichroism（MCD）,and magnetic circular polarization of luminescence（MCPL） in Gd3 Ga5 O12 :Eu3+and Eu3 Ga5 O12 garnets were studied within the visible spectral range at 300 K.Analysis of the spectral and temperature dependences of the magnetooptical and optical spectra made it possible to identify the magneto-dipole（MD） and electro-dipole（ED） 4f→4f transitions occurring between Stark sublevels of the7FJ（J=1,2） and5D0 multiplets in Eu3+-containing garnet structures.Quantum mechanical "mixing" had significant influence on quasi-degenerate states of the non-Kramers rare-earth Eu3+ion for Eu3 Ga5 O12 in MCD due to forbidden MD transition7F1 →5D0 and for Gd3 Ga5 O12 :Eu3+in MCPL due to MD 4f→4f transition5D0 →7F1 and forced ED-transition5D0 →7F2.A parameterized Hamiltonian defined to operate within the entire 4f（6）ground electronic configuration of Eu3+ion was used to model the experimental Stark levels,including their irreducible representations and wavefunctions.The crystal-field parameters were determined through a Monte-Carlo method in which nine independent crystal-field parameters,Bk q,were given random starting values and optimized using standard least-squares fitting between calculated and experimental levels.The final fitting standard deviation between 57 calculated-to-experimental levels was 0.73 meV.
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