Specialization: 011200 Physics
Program: 24 Neutron and Synchrotron Physics
Department of Nuclear Physics and Nuclear Methods of Investigations
Scientific advisor: I.A. Zobkalo
Reviewer: Prof. Dr. S.V. Grigoriev

An investigation of chiral domains of TbMn2O5 by polarized neutron scattering techniques
M.D. Kuchugura

In this work we report the results of the single crystal TbMn2O5 investigation, performed by the spherical neutron polarization technique. Such method permits unambiguously separate the contributions from different phenomena to the neutron polarization effects. The measurements were carried out at different temperatures, corresponding to the different phases of magnetic order in TbMn2O5: “high-temperature” incommensurate (HTIC), commensurate (CP), “low-temperature” incommensurate (LTIC).
The inspection of the non-diagonal components Pyx, Pzx of polarization matrices show that the population of the domains with “right” and “left” spirals is different in all magnetic ordered phases. Furthermore, this difference is the same for all these magnetic phases of TbMn2O5 – HTIC, CP, LTIC. This fact confirms the efficiency of DMI in all magnetically ordered phases, since only this interaction can produce the difference in the domain population. These results are completely consistent with the data from polarized neutron diffraction.

The list of publications
1.	M.D. Kuchugura, I.A. Zobkalo, A. Sazonov, V. Hutanu. Investigation of chirality in TbMn2O5 by spherical neutron polarimetry// International Workshop “Dzyaloshinskii-Moriya Interaction and Exotic Spin Structures ” (DMI-2015). May 26-30. Pskov, Russia. Book of Abstracts P101