Tunneling of magnetization versus spin-phonon and spin-spin transitions in LiY_0.998Ho_0.002F_4

Details Tunneling of magnetization versus spin-phonon and spin-spin transitions in LiY_0.998Ho_0.002F_4 Tunneling of magnetization versus spin-phonon and spin-spin transitions in LiY_0.998Ho_0.002F_4

2001-08-08

arxiv.org/abs/cond-mat/0108133v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 figures, Conference proceeding: 1st Joint European Magnetic Symposia (JEMS01'), Grenoble (France), 28th August - 1st Septemb

Scientific paper

10.1016/S0304-8853(01)01117-9

Strong hyperfine coupling in a 0.2% Holmium doped LiYF_4 single crystal induces staircaselike hysteresis loops of the magnetization at very low temperatures. The field sweep rate dependence of hysteresis loops allows the study of two different regimes in the magnetic relaxation of these weakly coupled magnetic moments. At slow field sweep rates, quantum tunneling of the magnetization occurs at avoided level crossings in the low-energy scheme of a single ion Ho^3+. At faster sweep rates, nonequilibrated spin-phonon and spin-spin transitions, mediated by weak dipolar interactions, lead to magnetization oscillations and additional steps.

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