Magnetic resonance in a cubic Γ 3 (E) doublet system II. Nuclear magnetic resonanace of 165 Ho (enhanced), 23 Na and 133 Cs in Cs 2 NaHoCl 6

Abstract
The enhanced nuclear magnetic resonance spectrum of 165Ho (I = 7/2) in the cubic compound Cs2NaHoCl6 has been measured from 20 K down to 0.6 K. Along a [111]-axis the value of (γ-γI) / 2π rises from 0.70 GHz T-1 at T = 20 K to 1.98 (2) GHz T-1 at 2 K. The temperature variation can be fitted accurately by using a cubic crystal field which gives a doublet Γ3 as the ground state, with a triplet Γ4 at 10.3(2) cm-1, followed by a singlet Γ1 at 30 to 40 cm-1. Below ca. 4 K the second-order Zeeman splitting of the doublet gives rise to a temperature-dependent anisotropy consistent with the cubic symmetry. This has been studied both through the enhanced 165Ho spectrum and through the paramagnetic shift in the 23Na (I = 3/2) spectrum. At higher temperatures the paramagnetic shifts of both 23Na and 133Cs (I = 7/2) are shown to be accurately proportional to the computed value of (γ-γI) / 2π for 165Ho. No departure from cubic symmetry is observed.

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