Nuclear Magnetic Resonance in Noncollinear Antiferromagnet Mn3Al2Ge3O12.
The 55Mn nuclear magnetic resonance spectrum of noncollinear 12-sublattice antiferromagnet Mn3Al2Ge3O12 has been studied in the frequency range of 200 - 640 MHz in the external magnetic field H || } at T=1.2 K. Three absorption lines have been observed in fields less than the field of the reorientation transition Hc at the polarization h||H of the rf field. Two lines have been observed at H > Hc 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 approximately 3% in the magnetization of sublattices in the field H < Hc. When the spin plane rotates from the orientation perpendicular to the C3 axis to the orientation perpendicular to the C4 axis, all magnetic moments of the electronic subsystem decrease by approximately 2% from the average value in the zero field.
Publisher URL: http://arxiv.org/abs/1710.10048
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