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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Lyubutin I. S., Gavriliuk A. G. , Struzhkin V. V.
Заглавие : Spin crossover and resulting insultor?metal transitions in Mott insulators under high pressure
Коллективы : Совещание по физике низких температур
Место публикации : XXXV Совещание по физике низких температур (НТ-35): тезисы докладов : Черноголовка, 29 сентября - 2 октября 2009 г./ Сов. по физ. низких температур. - С. 85. - ISBN 978-5-94691-384-3
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Flerov I. N.
Заглавие : Ferroelectric and ferroelastic phase transitions in some oxyfluorides A2AMOxF6-x with elpasolite-cryolite structure
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity
Место публикации : 9th Russai/CIS/Baltic/Japan symposium on ferroelectricity: abstracts book : June 15-19, 2008, Vilnius, Lithuania. - p.113
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bogdanov E. V., Fokina V. D., Flerov I. N., Gorev M. V., Vasiliev A. D., Pogoreltsev E. I., Laptash N. M.
Заглавие : Phase transitions in (NH4)2MoO2F4: effect of hydrostatic and chemical pressure
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity
Место публикации : 9th Russai/CIS/Baltic/Japan symposium on ferroelectricity: abstracts book : June 15-19, 2008, Vilnius, Lithuania. - p.139
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Fokina V.D., Flerov I.N., Molokeev M.S., Pogoreltsev E.I., Bogdanov E.V., Laptash N.M.
Заглавие : Effect of central cation substitution on the properties and phase transitions in (NH4)3Me(O2)2F4 oxyfluorides
Коллективы : International Seminar on Ferroelastic Physics
Место публикации : The 6th International Seminar on Ferroelastics Physics (ISFP-6): Voronezh, September 22–25, 2009. - С. 43
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vtyurin A.N., Krylov A.S., Gerasimova Ju.V., Ivanenko A.A., Shestakov N.P., Laptash N.M.
Заглавие : Ordering processes and phase transitions in ammonium-containing crystals of A2BWO3F3 elpasolites – com?parative Raman and infrared study
Коллективы : International Seminar on Ferroelastic Physics
Место публикации : The 6th International Seminar on Ferroelastics Physics (ISFP-6): Voronezh, September 22–25, 2009. - С. 23
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Smirnov L., Kolesnikov A., Flerov I. N., Laptash N. M.
Заглавие : The study of peculiarity of phase transitions in (NH4)2WO2F4 by inelastic neutrov scattering
Место публикации : 9th Russian/CIS/Baltic/Japan symposium on ferroelectricity, June 15-19, 2008, Vilnius, Lithuania, p.136
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krotov S. S., Kadomtseva A.M., Popov Yu.F., Vorob’ev G.P., Kuvardin A.V., Kamilov K.I., Bezmaternykh L. N., Popova E.A.
Заглавие : Magnetostriction and electric polarization anomalies in GdFe3(BO3)4 single crystals at phase transitions
Место публикации : JMMM. - Vol. 300, Is. 1. - P.e426-e429. - DOI 10.1016/j.jmmm.2005.10.183
Примечания : Cited References: 10
Аннотация: Our experimental and theoretical investigation was aimed at the study of different gadolinium ferroborate single-crystal properties both at spontaneous and high magnetic field-induced phase transitions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov V. V., Karimov D.N.
Заглавие : Nature of magnetic circular dichroism and absorption spectra of f-f transitions in Na0.4Ho0.6F2.2 single crystal
Колич.характеристики :5 с
Место публикации : Chem. Phys. - 2024. - Vol. 581. - Ст.112257. - ISSN 03010104 (ISSN), DOI 10.1016/j.chemphys.2024.112257. - ISSN 18734421 (eISSN)
Примечания : Cited References: 25
Аннотация: We present first study of magnetic circular dichroism (MCD) spectra of Ho3+ ion in C4v local symmetry, which it has in fluorite Na0.4Ho0.6F2.2. Optical absorption and MCD spectra were studied in this single crystal in the region of 5I8 5F3, 5F2, 3K8 and 5G5 transitions in the temperature range 3.6–––90 K. It was revealed, that number of transitions observed in the MCD and absorption spectra coincides with the number of transitions only from the doublet E state to singlet excited states. The E-E type transitions are not active in MCD, but they are not observed in the absorption spectra either. Paramagnetic magneto-optical activities (MOA) of the absorption bands and their temperature dependences were measured and interpreted with the help of the theory based on the nature of f-f transitions allowance. The MCD spectra were also analyzed in approximation of the J,±MJ wave functions of the free atom. It was shown in particular, that the lowest initial state of the transitions observed at T ˃ 10 K had MJ = 7, but this is not the lowest state of the holmium ion in the crystal. A little lower there is a quasi-doublet with MJ = 8 and, accordingly, with a higher magneto-optical activity of transitions from it. However, the intensity of transitions from this state is low.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shvets P., Krylov A. S., Maksimova K., Goikhman A.
Заглавие : Raman spectroscopy of Wadsley phases of vanadium oxide
Колич.характеристики :14 с
Место публикации : J. Raman Spectrosc. - 2024. - Vol. 55, Is. 4. - P.445-458. - ISSN 03770486 (ISSN), DOI 10.1002/jrs.6644. - ISSN 10974555 (eISSN)
Примечания : Cited References: 133. - This work was prepared with support from the Ministry of Science and Higher Education of the Russian Federation (project FZWM-2020-0008)
Аннотация: We summarize the current knowledge on crystal structures, synthesis, applications, and Raman spectroscopy of Wadsley phases of vanadium oxide, including VO2 (B), V6O13, V4O9, V3O7, and V2O5. While these oxides have garnered significant attention for potential energy storage applications and have been studied for decades, there remains inconsistency in data regarding their characteristic Raman spectra. To address this, we synthesized a series of Wadsley phases by physical vapor deposition of amorphous vanadium oxide films and subsequent annealing in a controlled environment. X-ray diffraction studies confirmed the formation of VO2 (B), V6O13, V4O9, and V3O7. We meticulously measured the room-temperature Raman spectra of these phases, offering robust reference data for the easy identification of vanadium oxides in unknown samples. Finally, we studied low-temperature phase transitions in VO2 (B) and V6O13.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Isaenko L., Dong L., Melnikova S. V., Molokeev M. S., Korzhneva K. E., Krinitsin P. G., Kurus A. F., Samoshkin D. A., Belousov R. A., Lin Zh.
Заглавие : Phase transitions and nonlinear optical property modifications in BaGa4Se7
Колич.характеристики :8 с
Место публикации : Inorg. Chem. - 2024. - Vol. 63, Is. 21. - P.10042-10049. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.4c01341. - ISSN 1520510X (eISSN)
Примечания : Cited References: 27. - This work was supported by the National Natural Science Foundation of China, grant no. 22133004 (first-principles studies), the Ministry of Education and Science of the Russian Federation, grant FSUS-2020-0036 (crystal growth, crystal structure analysis, and band gap measurement), and partly done on the state assignment of IGM SB RAS no. 122041400031-2 (composition chemical analysis and SHG coefficient measurements)
Аннотация: Phase transitions can change the crystal structure and modify the physical properties of crystals. In this work, we investigate the phase transition behavior in BaGa4Se7, an important middle infrared (mid-IR) nonlinear optical (NLO) crystal, in the temperature range from room temperature to 1173 K. Interestingly, the BaGa4Se7 crystal undergoes a reversible ferroelastic phase transition at T = 528 K, resulting in the presence of a newly discovered phase (γ-phase) at the higher temperature. The experimental temperature dependence of optical birefringence, as well as the first-principles birefringence and NLO coefficients, reveals that the γ-phase exhibits larger birefringence and better NLO properties compared with those of the low-temperature phase (α-phase). This work demonstrates that phase-transition-induced structural modification can improve the mid-IR NLO properties, which would provide an effective avenue to obtain materials with good optoelectronic performance.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarev V. S., Mikhaleva E. A., Gorev M. V., Molokeev M. S., Bogdanov E. V., Cherepakhin A. V., Flerov I. N.
Заглавие : Phase transitions, baro- and piezocaloric effects in single crystal and ceramics of ferroelectric NH4HSeO4
Колич.характеристики :10 с
Место публикации : Solid State Sci. - 2024. - Vol. 148. - Ст.107440. - ISSN 12932558 (ISSN), DOI 10.1016/j.solidstatesciences.2024.107440. - ISSN 18733085 (eISSN)
Примечания : Cited References: 45. - The study was supported by the grant of the Russian Science Foundation No. 23-22-10014, Krasnoyarsk Regional Science Foundation, https://rscf.ru/en/project/23-22-10014/
Аннотация: A study of heat capacity, thermal dilatation and sensitivity to hydrostatic and uniaxial pressure was carried out on single-crystal and ceramic samples of NH4HSeO4. The main parameters of low-temperature successive phase transitions B2 (T1) ↔ incommensurate IC (T2) ↔ ferroelectric P1 (T3) ↔ non-ferroelectric did not depend on the type of samples. The behavior of the volumetric strain and the results of direct measurements of T3(p) contributed to the resolution of the longstanding problem associated with the ambiguity of the sign of the corresponding volumetric baric coefficient. The role of thermal expansion anisotropy in the formation of the piezocaloric effect (PCE) near the ferroelectric phase transition at T3 has been studied. Due to the strong difference in the linear baric coefficients, the main contribution to the barocaloric effect (BCE) comes from the inverse intensive and extensive PCE associated with the a-axis. Compared to a single crystal, ceramics demonstrate lower BCE values, which, however, exist in a wider temperature range, which leads to close values of integral caloric parameters. The strong decrease in both BCE and PCE at low-temperature transformations in NH4HSeO4 compared to the ferroelectrics NH4HSO4 and NH4NH4SO4 is associated with a small change in entropy during three low-temperature phase transitions, ΣΔSi = 2.52 J/mol∙K, which is a consequence of a high degree of structural ordering in selenate as a result of a high-temperature transformation at T0 between the superionic and B2 phases, accompanied by a giant change in entropy, ΔS0≈Rln21.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Romanova O. B., Aplesnin S. S., Sitnikov M. N., Udod L. V., Zelenov F. V.
Заглавие : Phase transitions in a polycrystalline compound Ho0.1Mn0.9S
Колич.характеристики :6 с
Место публикации : Solid State Commun. - 2023. - Vol. 364. - Ст.115134. - ISSN 00381098 (ISSN), DOI 10.1016/j.ssc.2023.115134. - ISSN 18792766 (eISSN)
Примечания : Cited References: 35. - The investigation of microstructural properties of the samples was carried out using equipment's (SEM) the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center « Krasnoyarsk Science Center SB RAS». This work was supported by the Russian Science Foundation, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Science Foundation project no. 23-22-10016 «The colossal Nernst-Ettingshausen effect in manganese chalcogenides with rare earth substitution»
Аннотация: Sequence of structural transitions in the magnetically ordered region and a displacement-type structural transition at T = 220 K accompanied by the variation in the thermal expansion coefficient, ultrasound attenuation coefficient, g factor, and polarization current in the polycrystalline compound Ho0.1Mn0.9S was found. The electronic transitions above room temperature were established on the basis of the measurements of the conductivity, ultrasound attenuation maxima, and IR spectra.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vtyurin A. N., Krylov A. S., Krylova S. N., Roginskii E. M., Li J., Tian Y., Wei X.
Заглавие : Low-temperature phase transitions in ANLT4.5 ceramics
Коллективы : Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина, Ural Federal University, "Materials science and nanotechnology", International conference
Место публикации : Materials Science and Nanotechnology (MSN-2023): abstract book of International conference/ Ural Federal University; org. com. A. N. Vtyurin et al. - Ekaterinburg, 2023. - Ст.117. - P.28. - ISBN 978-5-9500624-6-9
Примечания : Cited References: 5
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gudim I. A., Eremin E. V., Krylov A. S., Titova V. R.
Заглавие : Effect of uncontrolled impurities on magnetic and structural transitions of the GdFe3(BO3)4 multiferroic
Коллективы : International Baltic Conference on Magnetism, Балтийский федеральный университет им. И. Канта
Место публикации : V International Baltic Conference on Magnetism. IBCM: Book of abstracts. - 2023. - P.128
Примечания : Cited References: 3. - Support by RSF and KRFS № 22-12-20019 are acknowledged
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Tegai S.Ph., Paklin N.N., Ovchinnikov S. G.
Заглавие : Magnetic transitions and excitonic order enhancement in spin crossover strongly correlated electron systems
Колич.характеристики :10 с
Место публикации : Mater. Today Commun. - 2023. - Vol. 37. - Ст.107191. - ISSN 23524928 (eISSN), DOI 10.1016/j.mtcomm.2023.107191
Примечания : Cited References: 53. - The study was supported by the Russian Science Foundation grant No. 22-22-20007, Krasnoyarsk Regional Science Foundation
Аннотация: The effects of exciton Bose condensation in strongly correlated spin crossover systems are considered within the effective Hamiltonian obtained from the two-orbital Hubbard–Kanamori model. The spectrum of collective excitations at various points of the temperature-crystal field phase diagram is calculated. The role of the electron–phonon interaction is discussed. A novel mechanism of excitonic and related magnetic order photoenhancement in strongly correlated spin crossover systems based on the massive collective phase mode appearance is demonstrated. In addition, we have shown that exciton and associated with it magnetic ordering can be photoinduced outside the exciton condensate phase due to the gap presence in the spectrum of single excitations.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zinenko V. I.
Заглавие : Thermodynamics of spin ice on an antiperovskite lattice in the cluster approximation
Колич.характеристики :5 с
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 7. - P.1203-1207. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.07.56415.63. - ISSN 10906460 (eISSN)
Примечания : Cited References: 9
Аннотация: Low-temperature thermodynamic properties of spin ice have been studied for compounds with the structure of antiperovskite containing rare-earth ions with the general chemical formula ReMeO (where Re - is a rare-earth element, Me - is a divalent metal). The calculations were carried out in the cluster approximation. The cases of undistorted and distorted ORe6 octahedron are discussed. In the case of an undistorted octahedron in the absence of an external magnetic field, the ground state of the system is infinitely degenerate. When an external magnetic field is applied, anomalies in the temperature dependences of heat capacity, entropy and magnetization are detected. In the case of a distorted octahedron and assuming that this distortion leads to the energy efficiency of two of the sixty-four configurations, it is obtained that there is a phase transition in the system of magnetic rare-earth ions.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld Yu. S., Kazak N. V., Bel’skaya N. A., Molokeev M. S., Gudim I. A., Kondratiev O. A., Eremin E. V., Knyazev Yu. V., Velikanov D. A., Ovchinnikov S. G.
Заглавие : Structural disorder, specific heat, and magnetic transitions in Cu2FeBO5
Колич.характеристики :12 с
Место публикации : J. Exp. Theor. Phys. - 2023. - Vol. 137, Is. 4: Special Issue dedicated to the 95th Anniversary of L. A. Prozorova. - P.494-505. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776123100175. - ISSN 10906509 (eISSN)
Примечания : Cited References: 25. - This study was supported by the Russian Foundation for Basic Research, project NNIO_a no. 21-52-12033
Аннотация: Cu2FeBO5 ludwigite single crystals have been grown from a solution–melt by spontaneous crystallization. Using the X-ray diffraction method, the crystal structure has been resolved in detail. Cations in sites M2, M3, and M4 have turned out to be structurally disordered. It has been found that oxygen atoms are disordered in one of five nonequivalent sites (O4). As can be seen from Mossbauer spectroscopy data, Fe3+ ions occupy four nonequivalent sites with different distortions of coordination octahedra. In the temperature range 40 K ≤ T ≤ 300 K, the spectra represent a superposition of quadrupole doublets. Static susceptibility measurements have revealed two magnetic features at T1 = 35 K and T2 = 20 K and spin-glass effects. Specific heat measurements in the interval 4–300 K have not discovered magnetic-transition-related anomalies.
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov V. V., Sukhachev A. L., Gudim I. A.
Заглавие : Magnetic circular dichroism of f-f transitions in multiferroic antiferromagnet Ho0.75Nd0.25Fe3(BO3)4
Коллективы : "Functional materials", International conference, Крымский федеральный университет имени В.И. Вернадского
Место публикации : Ovchinnikov S. G. International conference "Functional materials": book of abstracts/ ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2023. - P.100-101
Примечания : Cited References: 2
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmenko A. M., Ivanov V. Yu., Tikhanovsky A. Yu., Pimenov A. G., Shuvaev A. M., Gudim I. A., Mukhin A. A.
Заглавие : Terahertz spectroscopy of magnetoelectric HoAl3(BO3)4
Колич.характеристики :6 с
Место публикации : Opt. Spectrosc. - 2023. - Vol. 131, Is. 6. - P.409-414. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X23020121. - ISSN 15626911 (eISSN)
Примечания : Cited References: 18. - This study was partially financially supported by the Russian Science Foundation (project 16-12-10531)
Аннотация: Experimental and theoretical study of submillimeter (terahertz) spectroscopic and magnetic properties of the rare-earth aluminum borate HoAl3(BO3)4 were performed at temperatures 3–300K. In the transmittance spectra a number of resonance lines were detected at frequencies 2–35 cm–1 for different radiation polarizations. These modes were identified as transitions between the lower levels of the ground multiplet of the Ho3+ ion split by the crystal field, including both transitions from the ground state to the excited ones and transitions between the excited states. The established excitation conditions of the observed modes and the simulation of the spectra made it possible to separate the magnetic and electric dipole transitions and to determine the energies of the corresponding states, their symmetry, and the matrix elements of the transitions. Low-frequency lines that do not fit into the established picture of the electron states of Ho3+ were also found; these lines, apparently, correspond to the ions with the distorted by defects local symmetry of the crystal field.
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kazak N. V., Gokhfeld Yu. S., Belskaya N. A., Molokeev M. S., Gudim I. A., Eremin E. V., Knyazev Yu. V., Velikanov D. A., Ovchinnikov S. G.
Заглавие : Structural disorder, heat capacity, and magnetic transitions in Cu2FeBO5
Коллективы : Samarkand International Symposium on Magnetism, Samarkand State University
Место публикации : Book of abstacts of Samarkand International Symposium on Magnetism (SISM-2023)/ int. adv. com. S. G. Ovchinnikov [et al.]. - 2023. - Ст.3PO-L9-7. - P.208. - ISBN 978-5-00202-320-2
Примечания : Cited References: 3. - РФФИ № 21-52-12033
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