Nuclear Magnetic Resonance of the Spin Kinetics of 169Tm Nuclei in a Li(Y0.98Tm0.02)F4 Single Crystal

IF 1.3 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

JETP Letters Pub Date : 2025-10-02 DOI:10.1134/S0021364025606657

A. S. Parfishina, K. R. Safiullin, D. S. Nuzhina, E. M. Alakshin, A. G. Kiiamov, S. L. Korableva, A. A. Rodionov, M. S. Tagirov, I. V. Romanova

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Abstract

The spin echo signal of ¹⁶⁹Tm nuclei has been observed for the first time in the Li(Y_0.98Tm_0.02)F₄ dilute Van Fleck paramagnet. The anisotropy of the longitudinal and transverse relaxation rates and the width of the nuclear magnetic resonance line of ¹⁶⁹Tm nuclei relative to the [001] and [100] crystallographic axes has been detected. It has been shown that the main reason for the anisotropic behavior of relaxation rates is the dispersion of local magnetic fields of ¹⁶⁹Tm rare-earth nuclei due to the dipole–dipole interaction with surrounding magnetic ions. The correlation time of the hyperfine magnetic field on the ¹⁶⁹Tm nucleus has been estimated, which confirms its direct relationship to the longitudinal relaxation time of electron moments in the doublet excited state. The lifetime of the thulium ion in the excited state has been found to be approximately an order of magnitude longer than that in a LiTmF₄ single crystal.

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Li(Y0.98Tm0.02)F4单晶中169Tm核自旋动力学的核磁共振研究

在Li(Y0.98Tm0.02)F4稀释Van Fleck顺磁体中首次观测到169Tm原子核的自旋回波信号。检测了169Tm核的纵向和横向弛豫速率以及核磁共振线宽度相对于[001]和[100]晶体轴的各向异性。研究表明，弛豫速率各向异性的主要原因是169Tm稀土原子核与周围磁性离子的偶极-偶极相互作用导致局域磁场色散。对169Tm核上的超细磁场的相关时间进行了估计，证实了其与双重态激发态电子矩的纵向弛豫时间有直接关系。发现铥离子在激发态的寿命比在litms4单晶中的寿命大约长一个数量级。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

JETP Letters 物理-物理：综合

CiteScore

2.40

自引率

30.80%

发文量

164

审稿时长

3-6 weeks

期刊介绍： All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.