Probing spin dynamics and quantum relaxation in LiY0.998Ho0.002F4 via F-19 NMR (Articolo in rivista)

Type
Label
  • Probing spin dynamics and quantum relaxation in LiY0.998Ho0.002F4 via F-19 NMR (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Graf, MJ; Lascialfari, A; Borsa, F; Tkachuk, AM; Barbara, B (2006)
    Probing spin dynamics and quantum relaxation in LiY0.998Ho0.002F4 via F-19 NMR
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Graf, MJ; Lascialfari, A; Borsa, F; Tkachuk, AM; Barbara, B (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 73 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA; Dipartimento Fis A Volta, I-27100 Pavia, Italy; Unita INFM Pavia, I-27100 Pavia, Italy; SI Vavilov State Opt Inst, All Russia Sci Ctr, St Petersburg 199034, Russia; CNRS, Lab Magnetisme Louis Neel, F-38042 Grenoble 09, France (literal)
Titolo
  • Probing spin dynamics and quantum relaxation in LiY0.998Ho0.002F4 via F-19 NMR (literal)
Abstract
  • We report measurements of F-19 nuclear spin-lattice relaxation 1/T-1 as a function of temperature and external magnetic field in a LiY0.998Ho0.002F4 single crystal, a single-ion magnet exhibiting interesting quantum effects. The F-19 1/T-1 is found to depend on the coupling with the diluted rare-earth (RE) moments, making it an effective probe of the rare-earth spin dynamics. The results for 1/T-1 show a behavior similar to that observed in molecular nanomagnets, a result which we attribute to the discreteness of the energy levels in both cases. At intermediate temperatures the lifetime broadening of the crystal field split RE magnetic levels follows a T-3 power law. At low temperature the field dependence of 1/T-1 shows peaks in correspondence to the critical magnetic fields for energy level crossings (LC). A key result of this study is that the broadening of the levels at LC is found to become extremely small at low temperatures, about 1.7 mT, a value which is comparable to the weak dipolar fields at the RE lattice positions. Thus, unlike the molecular magnets, decoherence effects are strongly suppressed, and it may be possible to measure directly the level repulsions at avoided level crossings. (literal)
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