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Theoretical studies of spin-Hamiltonian parameters for Ni2+ ions in CsMgX3 (X = Cl, Br, I) crystals from the two-mechanism model

机译:基于两种机理模型的CsMgX3(X = Cl,Br,I)晶体中Ni2 +离子自旋哈密顿参数的理论研究

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In this paper, the high-order perturbation formulas of spin-Hamiltonian (SH) parameters (g factors g(parallel to), g(perpendicular to) and zero-field splitting D), including both the crystal-field (CF) and for the first tune charge-transfer (CT) mechanisms, are established for 3d(8) ions in trigonal octahedral clusters. By using these formulas, the SH parameters of Ni2+ ions in CSMgX3 (X = Cl, Br, 1) crystals are calculated. The results are consistent with the experimental values. The calculations suggest that the sign of Q(CT) (Q = Delta g(parallel to), Delta g(perpendicular to) or D, where the g-shift Delta g(i) = g(i)-g(e), g(e)approximate to 2.0023 is the value of free-electron) due to CT mechanism is the same as that of the corresponding Q(CF) due to CF mechanism, and the relative importance of CT mechanism (characterized by Q(CT)/Q(CF)) increases with the increasing atomic number of ligand X. So, for the 3d(n) MLm clusters with ligand having large atomic number, the reasonable theoretical explanations of all SH parameters should take both CF and CT tnechanisms into account. The defect structure of (NiX6)(4-) impurity centers in CSMgX3:Ni2+ crystals is also considered in our model. (c) 2007 Elsevier B.V. All rights reserved.
机译:本文提出了自旋哈密顿(SH)参数的高阶摄动公式(g因子g(平行于),g(垂直于)和零场分裂D),包括晶体场(CF)和的第一调谐电荷转移(CT)机制,是为三角八面体簇中的3d(8)离子建立的。通过使用这些公式,可以计算出CSMgX3(X = Cl,Br,1)晶体中Ni2 +离子的SH参数。结果与实验值一致。计算表明Q(CT)的符号(Q =增量g(平行于),增量g(垂直于)或D,其中g偏移增量g(i)= g(i)-g(e) ,由于CT机理引起的g(e)约为2.0023的自由电子值与由于CF机理引起的相应Q(CF)的值相同,并且CT机理的相对重要性(由Q(CT表征) )/ Q(CF))随着配体X原子序数的增加而增加。因此,对于具有大原子序数的配体的3d(n)MLm团簇,所有SH参数的合理理论解释应同时考虑CF和CT的机理。帐户。在我们的模型中还考虑了CSMgX3:Ni2 +晶体中(NiX6)(4-)杂质中心的缺陷结构。 (c)2007 Elsevier B.V.保留所有权利。

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