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首页> 外文期刊>Physical review >Electron paramagnetic resonance study of the Ce~(3+) pair centers in YAlO_3:Ce scintillator crystals
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Electron paramagnetic resonance study of the Ce~(3+) pair centers in YAlO_3:Ce scintillator crystals

机译：YAlO_3：Ce闪烁体晶体中Ce〜（3+）对中心的电子顺磁共振研究

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摘要

Single crystals of YAlO_3 doped with Ce have been studied by electron paramagnetic resonance (EPR) at the 9.4 and 34 GHz microwave bands. Besides the single-ion Ce~(3+) spectrum, measurements have revealed many satellite lines which belong to the Ce~(3+)-Ce~(3+) pair centers. Their spectra have been fitted by a general effective spin Hamiltonian describing two interacting particles with the spin S =(1/2). Corresponding g factors and spin-spin coupling constants have been determined. The spin-spin coupling constants are in the range from 0.1 up to 0.65 cm"1 for the nearest and next-nearest neighbors depending on the distance between Ce ions and their position. The exchange interaction between next-nearest neighbors (NNNs) is comparable to or even bigger than that between nearest neighbors (NNs), being in the range 0.4 - 0.6cm~(-1). For a single Ce~(3+) ion, crystal field parameters, energy sublevels of the ~2F_(5/2) and ~2F_(7/2) multiplets and principal g tensor components were obtained from the density functional theory calculation. They are in satisfactory agreement with those determined experimentally. The principal g tensor components of Ce~(3+) pair centers are also calculated. Nevertheless, it was impossible to assign each of the satellite lines to actual positions of the six NN and 12 NNN Ce pairs in the lattice due to lack of valid information on the sign of the exchange interactions. The influence of Ce~(3+) pairs on the luminescence efficiency is discussed as well.
机译：掺杂Ce的YAlO_3单晶已经在9.4和34 GHz微波频带上通过电子顺磁共振（EPR）进行了研究。除了单离子Ce〜（3+）光谱外，测量还发现许多卫星线属于Ce〜（3 +）-Ce〜（3+）对中心。它们的光谱已被一般有效的自旋哈密顿量拟合，该自旋哈密顿量描述了两个相互作用的粒子，自旋S =（1/2）。已经确定了相应的g因子和自旋-自旋耦合常数。对于最近邻和最近邻，自旋-自旋耦合常数在0.1到0.65 cm“ 1的范围内，具体取决于Ce离子之间的距离及其位置。近邻（NNN）之间的交换相互作用是可比较的大于或等于最近邻（NN）之间的离子，在0.4-0.6cm〜（-1）范围内。对于单个Ce〜（3+）离子，晶体场参数，〜2F_（5的能量子能级通过密度泛函理论计算得到了/ 2）和〜2F_（7/2）多重峰和主g张量分量，与实验确定的值相符合。Ce〜（3+）对中心的主g张量分量然而，由于缺乏有关交换相互作用的符号的有效信息，不可能将每条卫星线路分配给六个NN和12 NNN Ce对在晶格中的实际位置。 （3+）对发光效率的讨论ed。

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  • 来源
    《Physical review》 |2015年第22期|224105.1-224105.10|共10页
  • 作者

    M. Buryi; V. V. Laguta; E. Mihokova; P. Novak; M. Nikl;

  • 作者单位

    Institute of Physics AS CR, Cukrovarnicka 10, Prague, 16200, Czech Republic;

    Institute of Physics AS CR, Cukrovarnicka 10, Prague, 16200, Czech Republic,Institute of Physics, Opole University, Oleska 48, 45-052 Opole, Poland;

    Institute of Physics AS CR, Cukrovarnicka 10, Prague, 16200, Czech Republic;

    Institute of Physics AS CR, Cukrovarnicka 10, Prague, 16200, Czech Republic;

    Institute of Physics AS CR, Cukrovarnicka 10, Prague, 16200, Czech Republic;

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  • 正文语种 eng
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  • 关键词

    exchange interactions; color centers and other defects;

    机译：交流互动;色心和其他缺陷;

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