Nuclear spin driven quantum relaxation in LiY_0.998Ho_0.002F_4

Details Nuclear spin driven quantum relaxation in LiY_0.998Ho_0.002F_4 Nuclear spin driven quantum relaxation in LiY_0.998Ho_0.002F_4

2001-02-13

arxiv.org/abs/cond-mat/0102231v2

Phys. Rev. Lett. Vol. 87, 057203 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 eps figures, using RevTeX

Scientific paper

10.1103/PhysRevLett.87.057203

Staircase hysteresis loops of the magnetization of a LiY_0.998Ho_0.002F_4 single crystal are observed at subkelvin temperatures and low field sweep rates. This behavior results from quantum dynamics at avoided level crossings of the energy spectrum of single Ho^{3+} ions in the presence of hyperfine interactions. Enhanced quantum relaxation in constant transverse fields allows the study of the relative magnitude of tunnel splittings. At faster sweep rates, non-equilibrated spin-phonon and spin-spin transitions, mediated by weak dipolar interactions, lead to magnetization oscillations and additional steps.

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