Abstract
The dynamics of a one-dimensional chain that consists of 10–14 dipolar-coupled nuclear spins, is placed in an external magnetic field, and is irradiated by a periodic sequence of resonant π/n pulses (n is a natural number) with the same time delay 2τ between them has been studied. The numerical calculation has shown that thermodynamic equilibrium, which is determined by the common temperature of the Zeeman and dipole reservoirs, is established in the spin system at the average pulse field π/(2nτ) ∼ ωloc (where ωloc is the dipole frequency and n > 2) and times t ∼ ω −1loc . The relaxation of the magnetization in the system irradiated by (π/2)x pulses at π/4τ ≫ πlocis due to a four-spin resonant process, and the relaxation rate is proportional to τ4.
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Funding
This work was supported by the Ministry of Science and Higher Education of the Russian Federation (project no. 075-15-2020-779).
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Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 11, pp. 754–758.
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Bochkin, G.A., Vasil’ev, S.G., Fedorova, A.V. et al. Floquet Dynamics in a One-Dimensional Chain in the Multipulse Spin Locking of Nuclear Magnetic Resonance. Jetp Lett. 112, 715–719 (2020). https://doi.org/10.1134/S0021364020230046
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DOI: https://doi.org/10.1134/S0021364020230046