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. 2001 Jul 30;87(5):057203.
doi: 10.1103/PhysRevLett.87.057203. Epub 2001 Jul 17.

Nuclear spin driven quantum relaxation in LiY0.998Ho0.002F4

R Giraud  1 , W Wernsdorfer, A M Tkachuk, D Mailly, B Barbara
Affiliations

Nuclear spin driven quantum relaxation in LiY0.998Ho0.002F4

R Giraud et al. Phys Rev Lett. .

Abstract

Staircaselike hysteresis loops of the magnetization of a LiY0.998Ho0.002F4 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 Ho3+ 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, nonequilibrated spin-phonon and spin-spin transitions, mediated by weak dipolar interactions, lead to magnetization oscillations and additional steps.

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