Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-08-15
Physics
Condensed Matter
Other Condensed Matter
27 pages total, 5 figures, accepted for publication, Eur. Phys. J. B
Scientific paper
10.1140/epjb/e2008-00411-7
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.
Barbara Bernard
Borsa Ferdinando
Graf Matthias. J.
Lago J.
Lascialfari Alessandro
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