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Cross-relaxation and phonon bottleneck effects on magnetization dynamics in LiYF4:Ho3+ | S. Bertaina
; B. Barbara
; R. Giraud
; B.Z. Malkin
; M.V. Vanuynin
; A.I. Pominov
; A.L. Stolov
; A.M. Tkachuk
; | Date: |
3 Oct 2009 | Abstract: | Frequency and dc magnetic field dependences of dynamic susceptibility in
diluted paramagnets LiYF$_4$:Ho$^{3+}$ have been measured at liquid helium
temperatures in the ac and dc magnetic fields parallel to the symmetry axis of
a tetragonal crystal lattice. Experimental data are analyzed in the framework
of microscopic theory of relaxation rates in the manifold of 24
electron-nuclear sublevels of the lowest non-Kramers doublet and the first
excited singlet in the Ho$^{3+}$ ground multiplet $^5I_8$ split by the crystal
field of S$_4$ symmetry. The one-phonon transition probabilities were computed
using electron-phonon coupling constants calculated in the framework of
exchange charge model and were checked by optical piezospectroscopic
measurements. The specific features observed in field dependences of the in-
and out-of-phase susceptibilities (humps and dips, respectively) at the
crossings (anti-crossings) of the electron-nuclear sublevels are well
reproduced by simulations when the phonon bottleneck effect and the cross-spin
relaxation are taken into account. | Source: | arXiv, 0910.0519 | Services: | Forum | Review | PDF | Favorites |
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