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Linear and nonlinear optical spectroscopy of gadolinium iron borate GdFe3(BO3)(4) / A. M. Kalashnikova [et al.] // JETP Letters. - 2004. - Vol. 80, Is. 5. - P. 293-297, DOI 10.1134/1.1825108. - Cited References: 26 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
ORTHOFERRITES
Аннотация: The optical spectra and the second-harmonic generation (SHG) are studied in a noncentrosymmetric GdFe3(BO3)(4) magnet. In the region of weak absorption (alpha similar to 20-400 cm(-1)) below similar to3 eV, three absorption bands are distinguished, which can be unambiguously assigned to forbidden electronic transitions from the ground (6)A(1) state of the Fe3+ ion to its excited states T-4(1) (similar to1.4 eV), T-4(2) (similar to2 eV), and (4)A(1), E-4 (similar to2.8 eV). Intense absorption begins in the region above 3 eV (alpha similar to 2-4 x 10(5) cm(-1)), where two bands at similar to4.0 and 4.8 eV are observed, which are caused by allowed electric dipole charge-transfer transitions. The spectral features of SHG in the 1.2-3.0-eV region are explained by a change in the SHG efficiency caused by a change in the phase mismatch. It is shown that in the weak absorption region, phase matching can be achieved for SHG. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia
Russian Acad Sci, Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Univ Dortmund, D-44227 Dortmund, Germany
Univ Nijmegen, NSRIM Inst, NL-6525 Nijmegen, Netherlands
ИФ СО РАН
Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russian Federation
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Experimental Physics II, Dortmund University, Dortmund, 44227, Germany
NSRIM Institute, University of Nijmegen, 6525, Netherlands

Доп.точки доступа:
Kalashnikova, A. M.; Pavlov, V. V.; Pisarev, R. V.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bayer, M.; Rasing, T.
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Spin-crossover-induced Mott transition and the other scenarios of metallization in 3d(n) metal compounds / I. S. Lyubutin [et al.] // Phys. Rev. B. - 2009. - Vol. 79, Is. 8. - Ст. 85125, DOI 10.1103/PhysRevB.79.085125. - Cited References: 41 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
RARE-EARTH ORTHOFERRITES
   NARROW ENERGY BANDS
   HIGH-PRESSURE
   MAGNETIC COLLAPSE
   ELECTRON CORRELATIONS
   PHASE-TRANSITION
   STATE
   Y3FE5O12
   OXIDES
   EQUATION
Кл.слова (ненормированные):
bismuth compounds -- Hubbard model -- localised states -- metal-insulator transition -- metallisation -- spin systems
Аннотация: A different "Hubbard energy control" mechanism of the insulator-metal transition (IMT) in Mott-Hubbard insulators is discussed. This mechanism can be initiated by the lattice compression and it is driven by a spin crossover of 3d(5) ions from the high-spin state to the low-spin state. The spin crossover suppresses the effective Hubbard parameter U-eff down to the value enabling the insulator-metal transition according to the Mott mechanism U-eff/W approximate to 1. The classification of possible scenarios of metallization in the other 3d(n) metal compounds is also performed.

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Держатели документа:
[Lyubutin, I. S.] Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
[Ovchinnikov, S. G.] Russian Acad Sci, Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
[Gavriliuk, A. G.] RAS, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
[Struzhkin, V. V.] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA
ИФ СО РАН
Institute of Crystallography, Russian Academy of Sciences, Leninsky Pr. 59, Moscow 119333, Russian Federation
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Institute for High Pressure Physics, RAS, Troitsk, Moscow Region, Russian Federation
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States

Доп.точки доступа:
Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gavriliuk, A. G.; Struzhkin, V. V.
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Inelastic neutron studies and diffraction in magnetic fields of TbFeO3 and YbFeO3 / A. K. Ovsianikov, O. V. Usmanov, I. A. Zobkalo [et al.] // J. Magn. Magn. Mater. - 2022. - Vol. 563. - Ст. 170025, DOI 10.1016/j.jmmm.2022.170025. - Cited References: 37. - This work is supported by the Russian Foundation for Basic Research grant # 19-52-12047, and DFG grant # SA 3688/1-1. The neutron Experiments were performed at the instruments PUMA (MLZ), IN12 (ILL) and D23 (ILL). The authors express their gratitude to A. Bykov for his assistance to the XRD measurements . - ISSN 0304-8853
Кл.слова (ненормированные):
Neutron diffraction -- Orthoferrites -- Crystal structure -- Exchange interaction
Аннотация: Investigations of the orthoferrites TbFeO3 and YbFeO3 were performed by neutron inelastic scattering and neutron single crystal diffraction in magnetic fields. The low temperature evolution of energy gaps was explored for both compounds and considered from the point of view of changes of rare earth ion anisotropy. Exchange parameters between nearest neighbors for Fe3+ in TbFeO3 were obtained. The magnetic phase diagram for YbFeO3 was obtained and discussed as a result of the energy balance between Heisenberg exchange interactions, Dzyaloshinsky-Moriya interaction, anisotropy and external magnetic field.

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Держатели документа:
Institute of Crystallography, RWTH Aachen University, Jagerstra?e 17 – 19, Aachen, 52066, Germany
Petersburg Nuclear Physics Institute by B.P. Konstantinov of NRC «Kurchatov Institute», Orlova roshcha 1, Gatchina, 188300, Russian Federation
Forschungszentrum Julich GmbH, Julich Centre for Neutron Science at Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156 - 38042 Grenoble Cedex 9, France
Heinz Maier-Leibnitz Zentrum, Technical University of Munich, Garching, 85747, Germany
Forschungszentrum Julich GmbH, Julich Centre for Neutron Science at Heinz Maier- Leibnitz Zentrum, Lichtenbergstra?e 1, Garching, 85747, Germany
Universite Grenoble Alpes, Grenoble INP, Commissariat a l’energie atomique et aux energies alternatives, Interdisciplinary Research Institute of Grenoble -Modeling and Exploration of Materials Laboratory, Grenoble, 38000, France
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660071, Russian Federation

Доп.точки доступа:
Ovsianikov, A. K.; Usmanov, O. V.; Zobkalo, I. A.; Schmidt, W.; Maity, A.; Hutanu, V.; Ressouche, E.; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Terentjev, K. Yu.; Терентьев, Константин Юрьевич; Semenov, S. V.; Семёнов, Сергей Васильевич; Meven, M.; Roth, G.; Peters, L.
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Crystal field parameters and magnetic properties correlations in rare-earth orthoferrite HoFeO3 / O. V. Usmanov, A. K. Ovsianikov, I. A. Zobkalo [et al.] // J. Surf. Invest. - 2022. - Vol. 16, Is. 6. - P. 1041-1047, DOI 10.1134/S1027451022060258. - Cited References: 28. - This work was supported by the Russian Foundation for Basic Research grant no. 19-52-12 047, and DFG grant no. SA 3688/1-1 . - ISSN 1027-4510. - ISSN 1819-7094
Кл.слова (ненормированные):
orthoferrites -- X-ray powder diffraction -- crystal electric field parameters -- holmium orthoferrite -- magnetization temperature evolution -- CEF
Аннотация: The crystal structure and magnetic properties investigations of holmium orthoferrite compound HoFeO3 were performed in temperature range 7–300 K. Obtained XRD data confirm that HoFeO3 retains the orthorhombic perovskite structure of Pbnm space group. The crystal electric field (CEF) parameters of Ho3+ ion subsystem has been revealed numerically on the base of point charge model in the same temperature range. By this set of parameters CEF the splitting of Ho3+ energy levels was calculated and their temperature evolution was obtained. Modelling of isothermal magnetization M(H) with obtained set of parameters was carried out. Ho3+ single ion anisotropy due to CEF effects was demonstrated. Bulk magnetization evaluated from CEF was compared to experimental data.

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Держатели документа:
Petersburg Nuclear Physics Institute by B.P. Konstantinov of NRC “Kurchatov Institute,”, Gatchina, 188300, Russian Federation
Institute of Crystallography, RWTH Aachen University, Aachen, 52066, Germany
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660071, Russian Federation

Доп.точки доступа:
Usmanov, O. V.; Ovsianikov, A. K.; Zobkalo, I. A.; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Terentjev, K. Yu.; Терентьев, Константин Юрьевич; Semenov, S. V.; Семёнов, Сергей Васильевич
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