The two-level systems role in nuclear relaxation at low temperatures

The low-temperature relaxation via two-level systems is investigated. Two mechanisms are suggested for the nuclear relaxation, one of which gives a relaxation rate proportional to the lattice temperature T, while the second does not depend on T. The pointed mechanisms can serve as possible explanati...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1991-03, Vol.168 (3), p.205-210
Main Authors: Buishvili, L.L., Zakharov, L.Zh, Tugushi, A.I., Fokina, N.P.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
General theory of resonances and relaxations
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Physics
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Summary:The low-temperature relaxation via two-level systems is investigated. Two mechanisms are suggested for the nuclear relaxation, one of which gives a relaxation rate proportional to the lattice temperature T, while the second does not depend on T. The pointed mechanisms can serve as possible explanations of extremely fast nuclear relaxation at T ⪅ 0.1 K in frozen double alcohols [1] and holmium ethylsuflate [2]. The T-proportional mechanism satisfactorily agrees with the observed temperature and field dependence [1], and the mechanism independent of T presents a possible explanation of the fact [2] that the dependence of the relaxation time on T forms a plateau on decreasing temperature.
ISSN:0921-4526
1873-2135
DOI:10.1016/0921-4526(91)90672-2