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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Field dependence of spin–lattice relaxation of Nd3+ ions in Y3Al5O12 crystals
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Field dependence of spin–lattice relaxation of Nd3+ ions in Y3Al5O12 crystals

机译：Y3Al5O12晶体中Nd3 +离子自旋-晶格弛豫的场依赖性

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摘要

Our studies involve measuring spin–lattice relaxation times for Nd3+ ions in yttrium–aluminum garnets over the temperature range 4–50 K at 9.25 and 36.4 GHz for different orientations of the external magnetic field in relation to the crystallographic axes. The temperature dependence of the relaxation rate is described by T = ATn + b exp(–/kT), where n varies from sample to sample, with n=1 for "perfect" samples (i.e., with the longest relaxation times). Here is approximately 130 cm–1, which is the energy of the excited Kramers doublet of the neodymium ion closest to the ground state, and this makes it possible to interpret the second term in T as the contribution of two-stage relaxation proceeding through the intermediate level . A strong field dependence of these processes has been discovered: when the frequency was increased fourfold, the relaxation rate increased by a factor of 10. The effect is a specific manifestation of the degeneracy of the excited level, breaking of the symmetry of the crystalline field due to lattice defects, and the prevalence of deformations of a certain type in the spin–lattice interaction.
机译：我们的研究涉及在9.25和36.4 GHz的4-50 K温度范围内，针对外部磁场相对于晶轴的不同方向，测量钇铝石榴石中Nd3 +离子的自旋-晶格弛豫时间。弛豫速率的温度依赖性由T = ATn + b exp（-/ kT）来描述，其中n随样本的不同而变化，其中n = 1代表“完美”样本（即最长的弛豫时间）。这大约是130 cm–1，这是最接近基态的钕离子的激发Kramers双峰的能量，这使得可以将T中的第二项解释为两步弛豫在整个过程中的贡献。中级水平 。已发现这些过程对场的依赖性很强：当频率增加四倍时，弛豫率增加了10倍。其作用是激发能级简并性的特定表现，破坏了晶场的对称性。由于晶格缺陷，以及自旋-晶格相互作用中某种类型的变形普遍存在。

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