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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O. B., Har'kov A. M., Balaev D. A., Gorev M. V., Vorotynov A. M., Sokolov V. V., Pichugin A.
Заглавие : Metal–semiconductor transition in SmxMn1−xS solid solutions
Место публикации : Phys. Status Solidi B. - 2012. - Vol. 249, Is. 4. - P.812-817. - ISSN 0370-1972, DOI 10.1002/pssb.201147327
Примечания : Cited References: 27. - This study was supported by the Russian Foundation for Basic Research project No 09-02-00554_a; No 09-02-92001-NNS_a; No 11-02-98018 r_sibir_a; ADTP "Development of scientific potential of the higher school" No. 2.1.1/11763.
Предметные рубрики: Magnetic-properties
Phase-transition
SmS
Valence
Pressure
Crystal
Lattice
CeRhSb
Ключевые слова (''Своб.индексиров.''): kondo effect--metal-semiconductor transition--semiconductors--variable-valence elements
Аннотация: The electrical resistivity of the SmxMn1−xS (0.15 ≤ x ≤ 0.25) solid solutions in the temperature range of 80–300 K was measured. Minimum and maximum in the temperature dependence of the resistivity were found, respectively, at T = 220 K for x = 0.15 and at T = 100 K for x = 0.2 compounds. This behavior is explained from the result of the mobility-edge movement, the disorder being due to elastic deformation and spin density fluctuations with short-range order. Metal–semiconductor phase transition versus concentration at xc = 0.25 is observed. Resistivity is described by scattering electrons with acoustic phonon mode and with localized manganese spin. From the thermal expansion coefficient the compression of the lattice below the Néel temperature for Sm0.2Mn0.8S is found.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A. S., Vyunishev A. M., Zaitsev A. I., Ikonnikov A. A., Pospelov G. I., Slabko V. V., Zhokhova A. A.
Заглавие : Deep UV generation and fs pulses characterization using strontium tetraborate
Коллективы : Nonlinear Optics and Applications (5; 2011 ; Apr. ; 19-21; Prague, Czech Republic)
Место публикации : Proc. of SPIE: SPIE-Int. Soc. Optical Engineering, 2011. - Vol. 8071. - Ст.80710K. - ISSN 0277-786X, DOI 10.1117/12.886189. - ISSN 978-0-81948-661-5
Примечания : Cited References: 12
Предметные рубрики: CRYSTAL
Ключевые слова (''Своб.индексиров.''): nonlinear photonic crystal--strontium tetraborate--second harmonic generation--random quasi phase matching--ultrafast diagnostics
Аннотация: The properties of NPC structures in strontium tetraborate are analyzed. Different types of NPC structures are revealed that possess different nonlinear properties, and their spectral dependences of frequency conversion efficiency are calculated and compared. Experimental study of these structures is reported for the process of doubling of the second harmonic of fs Ti:S laser. Tuning of generated radiation is obtained in the range 187.5 - 232.5 nm, with extreme insensitivity to the angular orientation of NPC. Behavior of tuning curve along investigated fundamental wave range is similar in all studied samples, but efficiency obtained depends on the type of structure. Conversion efficiency and spectral quality of generated radiation is experimentally shown to grow better when using NPC with improved structure. Prospects of VUV converter on a single NPC are discussed. NPCs of SBO are demonstrated to be useful for autocorrelation diagnostics both in random QPM geometry and in the geometry of nonlinear diffraction from virtual beam.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasiliev A. D., Zel'bst E. A., Soldatenko A. S., Bolgova Yu.I., Trofimova O. M., Voronkov M. G.
Заглавие : Synthesis and molecular structure of cobalt(II) complex with 1-(1-silatranylmethyl)-1,2,4-triazole
Место публикации : Struct. Chem.: Springer/Plenum Publishers, 2013. - Vol. 24, Is. 4. - P.1001-1005. - ISSN 1040-0400, DOI 10.1007/s11224-012-0121-0
Примечания : Cited References: 24
Предметные рубрики: REACTIVITY
DERIVATIVES
CRYSTAL
SPECTRA
Ключевые слова (''Своб.индексиров.''): complexes--1-(1-silatranylmethyl)-1,2,4-triazole--cobalt dichloride--x-ray diffraction
Аннотация: Reaction of cobalt chloride with 1-(1-silatranylmethyl)-1,2,4-triazole in benzene afforded complex CoCl2 center dot 2L (L = 1-(1-silatranylmethyl)-1,2,4-triazole). It was isolated as the solvate [CoCl2 center dot 2L]center dot CH2Cl2 (1) by recrystallization from dichloromethane and structurally characterized by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group P2(1)/m with a = 6.798(2) E, b = 20.326(5) E, c = 11.005(3) E, and Z = 4. The cobalt atom is in slightly distorted square-planar environment, coordinated to two nitrogen atoms from two ligands and two chloride ions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Cherepakhin A. V., Zaitsev A. I., Aleksandrovsky A. S., Zamkov A. V.
Заглавие : Optical and nonlinear optical properties of orthorhombic BiB3O6
Место публикации : Opt. Mater.: Elsevier Science BV, 2012. - Vol. 34, Is. 5. - P.790-792. - ISSN 0925-3467, DOI 10.1016/j.optmat.2011.11.004
Примечания : Cited References: 13. - The work was supported by Ministry of Education and Science of Russian Federation (Contract 16.740.11.0150), Grant of President of Russian Federation for support of leading scientific schools No. SS-4645.2010.2, Grant No. RNP.2.1.1.3455, Project 3.9.1 of PSB RAS, and Projects No. 27.1 and No. 5 of SB RAS.
Предметные рубрики: BISMUTH BORATE BIB3O6
CRYSTAL
LASER
GENERATION
GROWTH
BIBO
Ключевые слова (''Своб.индексиров.''): orthorhombic bismuth triborate delta-bibo--refractive indices--nonlinear optical coefficients--nonlinear optical materials--phase matching
Аннотация: Dispersion of refraction coefficients of orthorhombic BiB3O6 in the wavelength range between 435.8 and 1060 nm is studied, nonlinear optical coefficients are determined, and phase matching angles, angular and spectral bandwidths for second harmonic generation processes are calculated. delta-BiBO may be suitable for doubling of lasers with a wavelength in the 1.3 mu m region as well as the matrix for self-doubling lasing media. (C) 2011 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Demidov A. A., Gudim, I. A., Eremin E. V.
Заглавие : Magnetic phase transitions in Nd1−xDyxFe3(BO3)4 ferroborates
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 114, Is. 2. - P.259-272. - ISSN 1063-7761, DOI 10.1134/S1063776111160023
Примечания : Cited References: 29. - This study was supported financially by the President of the Russian Federation (grant no. MK-497.2010.2).
Предметные рубрики: SPIN REORIENTATION
CRYSTAL
DY
ND
Аннотация: The magnetic properties of ferroborate single crystals with substituted compositions Nd1−xDyxFe3(BO3)4 (x = 0.15, 0.25) with competing exchange Nd-Fe and Dy-Fe interactions are investigated. For each composition, we observed a spontaneous spin-reorientation transition from the easy-axis to the easy-plane state and step anomalies on the magnetization curves for the spin-flop transition induced by a magnetic field B | c. The measured parameters and effects are interpreted using a unified theoretical approach based on the molecular field approximation and on calculations performed in the crystal-field model for the rare-earth ion. The experimental temperature dependences of the initial magnetic susceptibility from T = 2 K to T = 300 K, anomalies on the magnetization curves for B | c in fields up to 1.8 T, and their evolution with temperature, as well as temperature and field dependences of magnetization in fields up to 9 T are described. In the interpretation of experimental data, the crystal-field parameters in trigonal symmetry for the rare-earth subsystem are determined, as well as the parameters of Nd-Fe and Dy-Fe exchange interactions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Slabko V. V., Baturin I. S., Akhmatkhanov A. R., Shur V. Y.
Заглавие : Nonlinear Raman-Nath diffraction of femtosecond laser pulses
Коллективы : Russian Federation [MK-250.2013.2]; Krasnoyarsk Regional Fund for Science and Technical Activity Support; RAS grant [24.31]; Ural Federal University Development Program
Место публикации : Opt. Lett.: Optical Society of America, 2014. - Vol. 39, Is. 14. - P.4231-4234. - ISSN 0146-9592, DOI 10.1364/OL.39.004231. - ISSN 1539-4794
Примечания : Cited References: 22. - This work was partially supported by the Grant of the President of the Russian Federation MK-250.2013.2, Krasnoyarsk Regional Fund for Science and Technical Activity Support and by the RAS grant no. 24.31. A. A. acknowledges the financial support of young scientists through the Ural Federal University Development Program. The authors thank A. S. Chirkin and I. V. Timofeev for fruitful discussions and A. V. Barannik for optical microscopy of the samples.
Предметные рубрики: STRONTIUM BARIUM NIOBATE
2nd-HARMONIC GENERATION
PHOTONIC STRUCTURES
DOMAIN-STRUCTURE
LITHIUM-NIOBATE
CRYSTAL
Аннотация: We study the nonlinear Raman–Nath diffraction (NRND) of femtosecond laser pulses in a 1D periodic nonlinear photonic structure. The calculated second-harmonic spectra represent frequency combs for different orders of transverse phase matching. These frequency combs are in close analogy with the well-known spectral Maker fringes observed in single crystals. The spectral intensity of the second harmonic experiences a redshift with a propagation angle, which is opposite the case of Čerenkov nonlinear diffraction. We analyze how NRND is affected by the group-velocity mismatch between fundamental and second-harmonic pulses and by the parameters of the structure. Our experimental results prove the theoretical predictions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Melnikova S. V., Misyul S. V., Voronov V. N., Aleksandrov K. S.
Заглавие : Phase-transitions in elpasolite Rb2KSCF6
Место публикации : Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 7. - P.2185-2195. - ISSN 0367-3294
Примечания : Cited References: 24
Предметные рубрики: RB2KMIIIF6 ELPASOLITES
CS2NANDCL6
SCATTERING
RB2NADYF6
CS2RBDYF6
RB2KDYF6
CRYSTAL
MODE
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Trabs, Peter, Noack, Frank, Aleksandrovsky A. S., Zaitsev A. I., Radionov N. V., Petrov V.
Заглавие : Spectral fringes in non-phase-matched SHG and refinement of dispersion relations in the VUV
Место публикации : Opt. Express: Optical Society of America, 2015. - Vol. 23, Is. 8. - P.10091-10096. - ISSN 1094-4087, DOI 10.1364/OE.23.010091
Примечания : Cited References:11
Предметные рубрики: 2ND-HARMONIC GENERATION
CRYSTAL
STRONTIUM
SrB4O7
Аннотация: We consider second harmonic generation (SHG) of ultrashort pulses in the case of strong phase- and group-velocity mismatch. Spectral fringes appear in the second harmonic related to two delayed replicas of the fundamental pulse in the time domain. The fringe separation can be used to evaluate the group-velocity and refractive index of nonlinear crystals at extreme wavelengths. Experimental results with femtosecond pulses in SrB4O7 (SBO) are used to refine the Sellmeier equation describing the nc refractive index down to 160 nm, essential for the use of this unique nonlinear crystal for random quasi-phase-matching in the VUV.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pavlovskii M. S., Shinkorenko A. S., Zinenko V. I.
Заглавие : Calculation of lattice dynamics, elastic and dielectric properties of γ-BiB3O6 and δ-BiB3O6
Коллективы : Council on Grants from the President of the Russian Federation for Support of the "Leading Scientific Schools" [NSh-924.2014.2]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 4. - P.675-682. - ISSN 1063, DOI 10.1134/S1063783415040241. - ISSN 10906460(eISSN)
Примечания : Cited References:14. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of the "Leading Scientific Schools" (grant no. NSh-924.2014.2).
Предметные рубрики: BISMUTH BORATE BiB3O6
OPTICAL-PROPERTIES
CRYSTAL
RAMAN
Аннотация: The crystal lattice vibration frequencies, densities of phonon states, elastic moduli, and high-frequency permittivities have been calculated in terms of the density functional theory method for two polymorphs γ-BiB3O6 and δ-BiB3O6. Based on the calculated densities of phonon states, the temperature dependences of the free energies of two considered bismuth triborate modifications have been constructed, and the temperature of the phase transition between these modifications has been determined (1100 K). The structure of a possible nonpolar praphase of δ-BiB3O6 has been proposed. The polarization of δ-BiB3O6 has been estimated as 131 μC/cm2.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Trabs P., Noack F., Aleksandrovsky A. S., Zaitsev A. I., Petrov V.
Заглавие : Generation of coherent vacuum UV radiation in randomly quasi-phase-matched strontium tetraborate
Коллективы : Conference on Lasers and Electro-Optics
Место публикации : CLEO-SI: Optical Society of America, 2015. - P.2267. - ISBN 9781557529688 (ISBN), DOI 10.1364/CLEO_SI.2015.STh3H.2. - ISBN 2160-9020
Примечания : Cited References:6
Предметные рубрики: CRYSTAL
NM
Аннотация: Tunable coherent radiation is generated in the VUV down to 121 nm using random quasi-phase-matching in strontium tetraborate, the shortest wavelength ever produced with a second-order nonlinear optical process in a solid-state material. © 2015 Optical Society of America.
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