Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2009-11-22
JETP Letters, 2009, Vol.89, No.11, pp.553-557
Physics
Condensed Matter
Disordered Systems and Neural Networks
5 pages, 1 figure
Scientific paper
The effect of a magnetic field on the dipole echo amplitude in glasses (at temperatures of about 10 mK) induced by the dipole-dipole interaction of nuclear spins has been theoretically studied. It has been shown that a change in the positions of nuclear spins as a result of tunneling and their interaction with the external magnetic field E_H lead to a nonmonotonic magnetic field dependence of the dipole echo amplitude. The approximation that the nuclear dipole-dipole interaction energy E_d is much smaller than the Zeeman energy E_H has been found to be valid in the experimentally important cases. It has been shown that the dipole echo amplitude in this approximation may be described by a simple universal analytic function independent of the microscopic structure of the two-level systems. An excellent agreement of the theory with the experimental data has been obtained without fitting parameters (except for the unknown echo amplitude)
Parshin D. A.
Shumilin A. V.
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