Dynamical Jahn-Teller Effect in Paramagnetic Resonance Spectra: Orbital Reduction Factors and Partial Quenching of Spin-Orbit Interaction
Dynamical Jahn-Teller Effect in Paramagnetic Resonance Spectra: Orbital Reduction Factors and Partial Quenching of Spin-Orbit Interaction
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顺磁共振谱中的动态 Jahn-Teller 效应：轨道折减因子和自旋轨道相互作用的部分淬灭
DOI：
10.1103/physrev.138.a1727
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发表时间：
1965
期刊：
影响因子：
--
通讯作者：
F. Ham
中科院分区：
文献类型：
--
作者：
F. Ham
结果表明，在具有轨道简并性的复合物中，动力学Jahn-Teller效应可以部分抑制自旋-轨道相互作用、塞曼相互作用和超精细相互作用的轨道部分，以及其它控制对扰动（如应变或外加电场）响应的轨道算符.这样的动态淬灭，从而降低了通常归因于在顺磁共振研究共价键合的轨道减少因子的值，而不一定会导致在一个单独的复杂的光谱各向异性。动态Jahn-Teller效应也可以显著增强各种二阶效应。这样的动力学效应可以使自旋哈密顿量的参数发生重要变化，而不改变其对称性。结果表明，动态Jahn-Teller效应定性地解释了间隙过渡金属离子Cr 0，Mn+，Mn 0和Fe+在硅中的光谱中的异常特征，在解释MgO和CaO中Fe 2+的光谱中，它的重要性可能等于或大于共价键的重要性.本文对三重态轨道与双重态或三重态振动模相互作用的动力学效应进行了数学分析，并给出了与声子连续谱耦合时的一些结果。
It is shown that the dynamical Jahn-Teller effect in a complex having orbital degeneracy may partially quench spin-orbit interaction, the orbital parts of the Zeeman and hyperfine interactions, and other orbital operators governing response to perturbations such as strain or applied electric fields. Such dynamical quenching thus decreases the value of orbital reduction factors usually attributed in paramagnetic resonance studies to covalent bonding, without necessarily causing anisotropy in the spectrum of an individual complex. The dynamical Jahn-Teller effect may also substantially enhance various second-order effects. Such dynamic effects thus may make important changes in the parameters of the spin Hamiltonian without changing its symmetry. It is shown that the dynamical Jahn-Teller effect accounts qualitatively for unusual features in the spectra of interstitial transition-metal ions Cr 0, Mn+, Mn 0, and Fe+ in silicon and that it is probably of importance equal to or greater than that of covalent bonding in the interpretation of the spectrum of Fe 2+ in MgO and CaO. A mathematical analysis of the dynamical effects is given for an orbital triplet state in interaction with a doublet or triplet vibrational mode, and some results are given also when the coupling is with the phonon continuum.