We have studied the Ho3+ spin dynamics for LiY0.998Ho0.002F4 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 Ho3+ ion system has field-induced (avoided) level crossings. The reduction scales with calculated level repulsions, suggesting that mu(+) depolarization by slow fluctuations of nonresonant Ho3+ 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
Lascialfari A;
2007
Abstract
We have studied the Ho3+ spin dynamics for LiY0.998Ho0.002F4 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 Ho3+ ion system has field-induced (avoided) level crossings. The reduction scales with calculated level repulsions, suggesting that mu(+) depolarization by slow fluctuations of nonresonant Ho3+ spin states is partly suppressed when resonant tunneling opens new fluctuation channels at frequencies much greater than the muon precession frequency.File in questo prodotto:
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