Muon spin rotation studies of spin dynamics at avoided level crossings in LiY0.998Ho0.002F4

Details Muon spin rotation studies of spin dynamics at avoided level crossings in LiY0.998Ho0.002F4 Muon spin rotation studies of spin dynamics at avoided level crossings in LiY0.998Ho0.002F4

2007-09-05

arxiv.org/abs/0709.0684v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

18 pages, with 4 figures

Scientific paper

10.1103/PhysRevLett.99.267203

We have studied the Ho3+ spin dynamics for LiY0.998Ho0.002F4 through the positive muon (mu+) transverse field depolarization rate lambda_TF as a function of temperature and magnetic field. We find sharp reductions in lambda_TF(H) at fields of 23, 46 and 69 mT, for which the Ho3+ ion system has field-induced (avoided) level crossings. The reduction scales with calculated level repulsions, suggesting that mu+ depolarization by slow fluctuations of non-resonant Ho3+ spin states is partially suppressed when resonant tunneling opens new fluctuation channels at frequencies much greater than the muon precession frequency.

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