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arXiv · 0808.2137

19F nuclear spin relaxation and spin diffusion effects in the single ion magnet LiYF4:Ho3+

B. Z. Malkin·M. V. Vanyunin·M. J. Graf·J. Lago·F. Borsa·A. Lascialfari·A. M. Tkachuk·B. Barbara
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Abstract

Temperature and magnetic field dependences of the 19F nuclear spin-lattice relaxation in a single crystal of LiYF4 doped with holmium are described by an approach based on a detailed consideration of the magnetic dipole-dipole interactions between nuclei and impurity paramagnetic ions and nuclear spin diffusion processes. The observed non-exponential long time recovery of the nuclear magnetization after saturation at intermediate temperatures is in agreement with predictions of the spin-diffusion theory in a case of the diffusion limited relaxation. At avoided level crossings in the spectrum of electron-nuclear states of the Ho3+ ion, rates of nuclear spin-lattice relaxation increase due to quasi-resonant energy exchange between nuclei and paramagnetic ions, in contrast to the predominant role played by electronic cross-relaxation processes in the low-frequency ac-susceptibility.

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B. Z. Malkin, M. V. Vanyunin, M. J. Graf, J. Lago, F. Borsa, A. Lascialfari, A. M. Tkachuk, B. Barbara. 2008-08-15. 19F nuclear spin relaxation and spin diffusion effects in the single ion magnet LiYF4:Ho3+. https://doi.org/10.1140/epjb/e2008-00411-7

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