Electron Spin Resonance of Lithium Related Donor Centers in Bulk Si1−xGex Crystals Enriched in 28Si and 72Ge Isotopes

IF 1.1 4区物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Applied Magnetic Resonance Pub Date : 2024-01-29 DOI:10.1007/s00723-023-01640-w

E. A. Kalinina, D. V. Guseinov, A. V. Soukhorukov, A. A. Ezhevskii, D. G. Zverev, F. F. Murzakhanov, N. V. Abrosimov

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Abstract

The lithium donor centers in Si_1–xGe_x (x = 0.0039–0.05) single crystals enriched in spinless ²⁸Si and ⁷²Ge isotopes (99.998 and 99.984%, respectively) are studied by electron spin resonance at temperatures of T = 3.5–30 K and compared with its behavior in Si crystals. It is shown that lithium center with trigonal ([111]) symmetry has a most stable configuration in bulk Si_1–xGe_x for different values of x < 5 at %. Axial symmetry is explained by the distortion of the lithium central position and their neighboring atoms. The spin relaxation rates were studied in temperature range 4–30 K and it was shown that transverse and longitudinal relaxation consist of two components with rates differ by almost an order of magnitude. Together with Raman processes for 1/T₁, a decrease in the exponent below T⁵ is observed. This behavior is explained by cross-relaxation through states of the distorted configuration of lithium, which arise due to modulation of the crystal field potential by random distribution of Ge atoms.

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富含 28Si 和 72Ge 同位素的块状 Si1-xGex 晶体中锂相关供体中心的电子自旋共振

摘要在温度为 T = 3.5-30 K 时，通过电子自旋共振研究了富含无自旋 28Si 和 72Ge 同位素（分别为 99.998% 和 99.984%）的 Si1-xGex（x = 0.0039-0.05）单晶体中的锂供体中心，并将其与硅晶体中的行为进行了比较。研究表明，对于不同的 x < 5 at % 值，具有三方（[111]）对称性的锂中心在块状 Si1-xGex 中具有最稳定的构型。轴对称性可以通过锂中心位置及其邻近原子的变形来解释。在 4-30 K 的温度范围内对自旋弛豫速率进行了研究，结果表明横向和纵向弛豫由两个部分组成，其速率几乎相差一个数量级。与 1/T1 的拉曼过程一起，观察到指数在 T5 以下有所下降。这种行为可以通过锂的扭曲构型状态的交叉弛豫来解释，锂的扭曲构型状态是由于 Ge 原子的随机分布对晶体场势的调制而产生的。

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来源期刊

Applied Magnetic Resonance 物理-光谱学

CiteScore

1.90

自引率

10.00%

发文量

审稿时长

2.3 months

期刊介绍： Applied Magnetic Resonance provides an international forum for the application of magnetic resonance in physics, chemistry, biology, medicine, geochemistry, ecology, engineering, and related fields. The contents include articles with a strong emphasis on new applications, and on new experimental methods. Additional features include book reviews and Letters to the Editor.