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Barannik, A. V.
Interference oscillations in the dynamics of the optical response of polymer dispersed nematic liquid crystals / A. V. Barannik, A. V. Shabanov, V. Y. Zyryanov // Tech. Phys. Lett. - 2002. - Vol. 28, Is. 8. - P. 675-677, DOI 10.1134/1.1505547. - Cited References: 14 . - ISSN 1063-7850

РУБ Physics, Applied
Рубрики:
REORIENTATION
MONOLAYER
Аннотация: The dynamics of the optical response of a polymer-dispersed nematic liquid crystal under the action of electric field pulses was experimentally studied for film samples differing in the size of nematic droplets. The optical signal relaxation curve exhibits an oscillating character, with the number of oscillations determined by the transverse size of the nematic droplets. The interference character of the signal oscillations is confirmed by an analysis of the oscillating response within the framework of the anomalous diffraction approximation and by a comparison with the dependence of the transmitted light intensity on the applied voltage measured in a static regime. (C) 2002 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shabanov, A. V.; Шабанов, Александр Васильевич; Zyryanov, V. Y.; Зырянов, Виктор Яковлевич
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Low-temperature spin dynamics in the TmFeO3 orthoferrite with a non-Kramers ion / S. A. Skorobogatov, S. E. Nikitin, K. A. Shaykhutdinov [et al.] // Phys. Rev. B. - 2020. - Vol. 101, Is. 1. - Ст. 014432, DOI 10.1103/PhysRevB.101.014432. - Cited References: 41. - We thank A. Sukhanov for stimulating discussions and D. Abernathy for support with data acquisition. This research used resources at the High Flux Isotope Reactor and Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. S.E.N. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). Laue x-ray diffraction measurements were conducted at the Center for Nanophase Materials Sciences (CNMS) (CNMS2019-R18) at Oak Ridge National Laboratory (ORNL), which is a DOE Office of Science User Facility . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
NEUTRON-SCATTERING
   REORIENTATION
   VISUALIZATION
   EXCITATIONS
   SOFTWARE
Аннотация: We investigate the magnetic dynamics of the orthorhombic perovskite TmFeO3 at low temperatures, below the spin reorientation transition at TSR≈80 K, by means of time-of-flight neutron spectroscopy. We find that the magnetic excitation spectrum combines two emergent collective modes associated with different magnetic sublattices. The Fe subsystem orders below TN∼632 K into a canted antiferromagnetic structure and exhibits sharp, high-energy magnon excitations. We describe them using linear spin-wave theory, and reveal a pronounced anisotropy between in- and out-of-plane exchange interactions, which was mainly neglected in previous reports on the spin dynamics in orthoferrites. At lower energies, we find two crystalline electrical field (CEF) excitations of Tm3+ ions at energies of ∼2 and 5 meV. In contrast to the sister compound YbFeO3, where the Yb3+ ions form quasi-one-dimensional chains along the c axis, the Tm excitations show dispersion along both directions in the (0KL) scattering plane. Analysis of the neutron scattering polarization factor reveals a longitudinal polarization of the 2 meV excitation. To evaluate the effect of the CEF on the Tm3+ ions, we perform point-charge model calculations, and their results quantitatively capture the main features of Tm single-ion physics, such as energies, intensities, and polarization of the CEF transitions, and the type of magnetic anisotropy.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Dept Solid State Phys & Nanotechnol, Krasnoyarsk 660041, Russia.
Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany.
Tech Univ Dresden, Inst Festkorper & Mat Phys, D-01069 Dresden, Germany.
Oak Ridge Natl Lab, Neutron Technol Div, POB 2009, Oak Ridge, TN 37831 USA.
Oak Ridge Natl Lab, Neutron Scattering Div, POB 2009, Oak Ridge, TN 37831 USA.
Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland.

Доп.точки доступа:
Skorobogatov, S. A.; Скоробогатов, Станислав Алексеевич; Nikitin, S. E.; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Balaev, A. D.; Балаев, Александр Дмитриевич; Terentjev, K. Yu.; Терентьев, Константин Юрьевич; Ehlers, G.; Sala, G.; Pomjakushina, E., V; Conder, K.; Podlesnyak, A.; International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM)
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