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A. M. Tikhonov - One of the best experts on this subject based on the ideXlab platform.

  • Nuclear magnetic resonance in noncollinear antiferromagnet Mn_3Al_2Ge_3O_12
    JETP Letters, 2012
    Co-Authors: A. M. Tikhonov, N. G. Pavlov, O. G. Udalov
    Abstract:

    The ^55Mn nuclear magnetic resonance spectrum of noncollinear 12-sublattice antiferromagnet Mn_3Al_2Ge_3O_12 has been studied in the frequency range of 200–640 MHz in the external magnetic field H ‖ [001] at T = 1.2 K. Three absorption lines have been observed in fields less than the field of the reorientation transition H _c at the polarization h ‖ H of the rf field. Two lines have been observed at H > H _c and h ⊥ H . The spectral parameters indicate that the magnetic structure of manganese garnet differs slightly from the exchange triangular 120-degree structure. The anisotropy of the Spin Reduction and (or) weak antiferromagnetism that are allowed by the crystal symmetry lead to the difference of ≈3% in the magnetization of sublattices in the field H < H _c. When the Spin plane rotates from the orientation perpendicular to the C _3 axis to the orientation perpendicular to the C _4 axis, all magnetic moments of the electronic subsystem decrease by ≈2% from the average value in the zero field.

  • On the NMR spectrum in antiferromagnetic CsMnI_3
    Journal of Experimental and Theoretical Physics Letters, 1999
    Co-Authors: V. I. Marchenko, A. M. Tikhonov
    Abstract:

    An explanation is proposed for the Spin-Reduction anisotropy observed in an investigation of NMR in the noncollinear six-sublattice antiferromagnet CsMnI_3.

  • Observation of Spin-Reduction anisotropy in the quasi-one-dimensional antiferromagnet CsMnI_3
    Journal of Experimental and Theoretical Physics Letters, 1998
    Co-Authors: B. S. Dumesh, S. V. Petrov, A. M. Tikhonov
    Abstract:

    The NMR of ^55Mn in the quasi-one-dimensional noncollinear antiferromagnet CsMnI_3 at T =1.3 K is investigated in magnetic fields up to ∼40 kOe. Six NMR branches corresponding to six manganese Spins per magnetic unit cell are observed. The NMR spectra correspond satisfactorily to the well-known magnetic structure of CsMnI_3, taking into account the dynamic frequency shift due to the interaction with the low-lying AFMR modes. The average Spins 〈 S _A〉=1.86 and 〈 S _B〉=1.74 of the magnetically nonequivalent Mn^2+ ions are determined from the measured values of the hyperfine fields. The results obtained agree qualitatively with the calculations of Spin Reduction in quasi-one-dimensional antiferromagnets [Y. Watabe, T. Suzuki, and Y. Natsume, Phys. Rev. B 52 , 3400 (1995)].

V V Sokolov - One of the best experts on this subject based on the ideXlab platform.

S S Aplesnin - One of the best experts on this subject based on the ideXlab platform.

а M Kharkov - One of the best experts on this subject based on the ideXlab platform.

M N Sitnikov - One of the best experts on this subject based on the ideXlab platform.