We have studied the Ho(3+) spin dynamics for LiY(0.998)Ho(0.002)F(4) via the positive muon (mu(+)) transverse field depolarization rate lambda(TF) as a function of temperature and magnetic field. We find sharp minima in lambda(TF)(H) at fields for which the Ho(3+) ion system has field-induced (avoided) level crossings. The reduction scales with calculated level repulsions, suggesting that mu(+) depolarization by slow fluctuations of nonresonant Ho(3+) spin states is partly suppressed when resonant tunneling opens new fluctuation channels at frequencies much greater than the muon precession frequency.
Muon spin rotation studies of spin dynamics at avoided level crossings in LiY0.998Ho0.002F4 / M.J. Graf, J. Lago, A. Lascialfari, A. Amato, C. Baines, S.R. Giblin, J.S. Lord, A.M. Tkachuk, B. Barbara. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 99:26(2007), pp. 267203.1-267203.4.
Muon spin rotation studies of spin dynamics at avoided level crossings in LiY0.998Ho0.002F4
A. Lascialfari;
2007
Abstract
We have studied the Ho(3+) spin dynamics for LiY(0.998)Ho(0.002)F(4) via the positive muon (mu(+)) transverse field depolarization rate lambda(TF) as a function of temperature and magnetic field. We find sharp minima in lambda(TF)(H) at fields for which the Ho(3+) ion system has field-induced (avoided) level crossings. The reduction scales with calculated level repulsions, suggesting that mu(+) depolarization by slow fluctuations of nonresonant Ho(3+) spin states is partly suppressed when resonant tunneling opens new fluctuation channels at frequencies much greater than the muon precession frequency.
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