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, and A. M. Tkachuk
Phys. Rev. B 74, 184421 – Published 17 November 2006

Abstract

Frequency and dc magnetic field dependences of dynamic susceptibility in diluted paramagnets LiYF4:Ho3+ have been measured at liquid helium temperatures in ac and dc magnetic fields parallel to the symmetry axis of a tetragonal crystal lattice. Experimental data are analyzed in the framework of the 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 Ho3+ ground multiplet I85 split by the crystal field of S4 symmetry. The one-phonon transition probabilities were computed using electron-phonon coupling constants calculated in the framework of the 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 (anticrossings) of the electron-nuclear sublevels are well reproduced by simulations when the phonon bottleneck effect and the cross-spin relaxation are taken into account.

    • Received 5 July 2006

    DOI:https://doi.org/10.1103/PhysRevB.74.184421

    ©2006 American Physical Society

    Authors & Affiliations

    S. Bertaina1,2, B. Barbara1, R. Giraud1,3, B. Z. Malkin4, M. V. Vanuynin4, A. I. Pominov4, A. L. Stolov4, and A. M. Tkachuk5

    • 1Laboratoire de Magnétisme Louis Néel, CNRS, BP 166, 38042 Grenoble CEDEX-09, France
    • 2Ecole Nationale Supérieure de Physique de Grenoble, 38402, St-Martin d’Hères, France
    • 3LPN, CNRS, 91460-Marcoussis, France
    • 4Kazan State University, Kazan 420008, Russian Federation
    • 5S.I. Vavilov State Optical Institute, St. Petersburg 199034, Russian Federation

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    Issue

    Vol. 74, Iss. 18 — 1 November 2006

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