TITLE

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

AUTHOR(S)
Malkin, B. Z.; Vanyunin, M. V.; Graf, M. J.; Lago, J.; Borsa, F.; Lascialfari, A.; Tkachuk, A. M.; Barbara, B.
PUB. DATE
October 2008
SOURCE
European Physical Journal B -- Condensed Matter;Oct2008, Vol. 66 Issue 2, p155
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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 Ho3 + ions, 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.
ACCESSION #
35623063

 

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