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

Autor:	Graf, M. J., Lago, J., Lascialfari, A., Amato, A., Baines, C., Giblin, S. R., Lord, J. S., Tkachuk, A. M., Barbara, B.
Rok vydání:	2007
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.99.267203
Popis:	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. Comment: 18 pages, with 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0709.0684 Zobrazit plný text záznamu View this record from Arxiv