8Li+ β-NMR in the Cubic Insulator MgO

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Macfarlane, W.A.^1 ; Parolin, T.J.^1 ; Cortie, D.L.^1,2,3 ; Chow, K.H.^4 ; Hossain, M.D.^2 ; Kiefl, R.F.^2 ; Levy, C.D.P.^5 ; McFadden, R.M.L.^1 ; Morris, G.D.^5 ; Pearson, M.R.^5 ; Saadaoui, H.^2,6 ; Salman, Z.^5,6 ; Song, Q.^2 ; Wang, D.^2

Chemistry Department, University of British Columbia, Vancouver

BC

V6T 1Z1, Canada^1

Department of Physics and Astronomy, University of British Columbia, Vancouver

BC, Canada^2

Quantum Matter Institute, University of British Columbia, Vancouver

BC

V6T 1Z1, Canada^3

Department of Physics, University of Alberta, Edmonton

AB

T6G 2E1, Canada^4

TRIUMF, Vancouver

BC

V6T 2A3, Canada^5

Paul Scherrer Institute, Laboratory for Muon Spin Spectroscopy, Villigen PSI

5232, Switzerland^6

关键词: Frequency determination;    High magnetic fields;    Implantation energies;    Low temperatures;    Narrow resonances;    NMR measurements;    Shift measurement;    Temperature dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012033/pdf
DOI  :  10.1088/1742-6596/551/1/012033

来源: IOP

【 摘 要 】

We present extensive high magnetic field β-NMR measurements of8Li+implanted in single crystals of MgO. The narrow resonance, consistent with a cubic8Li+site, likely the tetrahedral interstitital, is used routinely as a reference for shift measurements. We show the intrinsic linewidth is on the order of 200 Hz, allowing a frequency determination to an accuracy of a few Hz. We find no implantation energy dependence of the resonance within a few ppm, but there is evidence of slow spin dynamics in hole-burning measurements. The spin lattice relaxation is slow. The temperature dependence reveals interesting changes at low temperature whose origin remains uncertain.