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

Authors :
Giraud R
Wernsdorfer W
Tkachuk AM
Mailly D
Barbara B
Source :
Physical review letters [Phys Rev Lett] 2001 Jul 30; Vol. 87 (5), pp. 057203. Date of Electronic Publication: 2001 Jul 17.
Publication Year :
2001

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.

Details

Language :
English
ISSN :
0031-9007
Volume :
87
Issue :
5
Database :
MEDLINE
Journal :
Physical review letters
Publication Type :
Academic Journal
Accession number :
11497804
Full Text :
https://doi.org/10.1103/PhysRevLett.87.057203