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28 March 2024
 
  » arxiv » 0808.2137

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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 ;
Date 15 Aug 2008
AbstractTemperature 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.
Source arXiv, 0808.2137
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