Изменение вероятности оптических переходов в ионе Yb-=SUP=-3+-=/SUP=- при магнитных фазовых переходах в мультиферроике Cu-=SUB=-3-=/SUB=-Yb(SeO-=SUB=-3-=/SUB=-)-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-Cl

Оптика и спектроскопия Pub Date : 2023-01-01 DOI:10.21883/os.2023.07.56125.4397-23

Степан Андреевич Климин, Елена Сергеевна Кузнецова, П.С. Бердоносов

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Abstract

The infrared transmission spectra of Cu3Yb(SeO3)2O2Cl, an ytterbium analogue of the natural mineral francisite, have been studied in a wide temperature range. Two phase transitions (at TN = 35 K and TR = 9 K) were registered by studying the splittings of Yb3+ Kramers doublets. It is shown that the low-temperature transition is spin-reorientational one. An analysis within the framework of the mean field theory allows us to conclude that the single-ion magnetic anisotropy of ytterbium does not coincide with the anisotropy of the copper magnetic subsystem. An estimate of the energy required for the reorientation of the copper magnetic subsystem has been obtained, it is 864 Jmol-1. It was found that the probability of a 0-0 transition in the Yb3+ ion changes in the temperature range of both phase transitions, presumably due to spontaneous magnetostriction.

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在多元费率(Cu- 3-= -3-= - SUB -= -3-= =SUB -2-= =SUB -2-= SUB -2-= SUB -2-= SUB -2-= SUB -2-= =SUB - l)中，光学跃迁概率的变化

研究了天然矿物方解石的镱类似物Cu3Yb(SeO3)2O2Cl在较宽温度范围内的红外透射光谱。在TN = 35 K和TR = 9 K时，通过研究Yb3+ Kramers双重态的分裂记录了两个相变。结果表明，低温转变为自旋取向转变。在平均场理论框架内的分析使我们得出结论，镱的单离子磁各向异性与铜磁子系统的各向异性不一致。对铜磁分系统重定向所需能量进行了估计，为864 Jmol-1。结果表明，在两个相变温度范围内，Yb3+离子发生0-0相变的概率发生了变化，这可能是自发磁致伸缩引起的。

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