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Вид документа : Однотомное издание
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Miskevich A. A., Krakhalev M. N., Prishchepa O. O., Shabanov A. V., Zyryanov V. Ya.
Заглавие : Electro-optical response of a monolayer polymer dispersed nematic liquid crystal film doped with surfactant
Место публикации : Liquid Crystal Polymer Nanocomposites: Woodhead Publishing, 2022. - Chapter 7. - P.163-211. - , DOI 10.1016/B978-0-12-822128-0.00006-6
Примечания : Cited References: 86
Аннотация: Light scattering and transmission by a monolayer polymer dispersed liquid crystal film containing liquid crystal droplets with inhomogeneous anchoring of liquid crystal molecules at the polymer-droplet interface is considered theoretically and experimentally. The developed optical model is based on the anomalous diffraction and interference approximations of the theory of scattering of waves. It is applied to describe the interference quenching effect for the coherently transmitted light and electrically controllable symmetry breaking effect in small-angle structure of light scattered by film containing droplets with inhomogeneous anchoring. The analysis of transmittance and reflectance of the one-dimensional photonic crystals composed of monolayers is carried out. The formation of the photonic band gaps is analyzed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Long-Range Orientational Order, Local-Field Anisotropy, and Mean Molecular Polarizability in Liquid Crystals
Разночтения заглавия :авие SCOPUS: Long-range orientational order, local-field anisotropy, and mean molecular polarizability in liquid crystals
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 108, Is. 1. - P176-186. - ISSN 1063-7761, DOI 10.1134/S106377610901021X
Примечания : Cited References: 35
Предметные рубрики: REFRACTIVE-INDEXES
OPTICAL ANISOTROPY
Ключевые слова (''Своб.индексиров.''): anisotropy--crystal symmetry--crystals--electric fields--light sources--liquid crystals--liquids--molecules--tensors--biaxial liquid crystals--calamitic--discotic--discotic liquid crystals--experimental datum--field models--lorentz--mesoscopic--molecular polarizability--orientational orders--phase state--nematic liquid crystals
Аннотация: The problems on the relation of the mean effective molecular polarizability (gamma) over bar to the long-range orientational order of molecules (the optical anisotropy of the medium) in uniaxial and biaxial liquid crystals, the local anisotropy on mesoscopic scales, and the anisotropy of the Lorentz tensor L and the local-field tensor f are formulated and solved. It is demonstrated that the presence of the long-range orientational order of molecules in liquid crystals imposes limitations from below on the molecular polarizability (gamma) over bar, which differs for uniaxial and biaxial liquid crystals. The relation between the local anisotropy and the molecular polarizability (gamma) over bar is investigated for calamitic and discotic uniaxial liquid crystals consisting of lath- and disk-shaped molecules. These liquid crystals with identical macroscopic symmetry differ in the local anisotropy and the relationships between the components L(parallel to) L(perpendicular to,) f(parallel to) f(perpendicular to) (calamitic) and L(parallel to) L(perpendicular to,) f(parallel to) f(perpendicular to) (discotic) for an electric field oriented parallel and perpendicular to the director. The limitations from below and above on the molecular polarizability (gamma) over bar due to the anisotropy of the tensors L and f are established for liquid crystals of both types. These limitations indicate that the molecular polarizability (gamma) over bar depends on the phase state and the temperature. The factors responsible for the nonphysical consequences of the local-field models based on the approximation (gamma) over bar = const are revealed. The theoretical inferences are confirmed by the experimental data for a number of calamitic nematic liquid crystals with different values of birefringence and the discotic liquid crystal Col(ho).
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S. G.
Заглавие : Comparison of electronic structure, magnetic mechanism, and symmetry of pairing in ruthenates and cuprates
Место публикации : Ruthenate and rutheno-cuprate materials: unconventional superconductivity, magnetism and quantum phase transitions. Ser. lecture notes in physics: Springer Verlag, 2002. - Vol. 603: International Conference on Ruthenate and Rutheno-Cuprate Materials (OCT 25-27, 2001, VIETRI SUL MARE, ITALY). - P.239-255. - ISBN 0075-8450. - ISBN 3-540-44275-8
Примечания : Cited References: 48
Предметные рубрики: METAL-INSULATOR-TRANSITION
SUPERCONDUCTOR SR2RUO4
LAYERED PEROVSKITE
BAND-STRUCTURE
CORRELATED ELECTRONS
MOTT TRANSITION
COPPER OXIDES
HUBBARD-MODEL
RUSR2GDCU2O8
CA2-XSRXRUO4
Аннотация: A generalized tight-binding (GTB) method is developed to calculate quasi-particle band structure with explicit account for strong electronic correlations. The GTB method combines exact diagonalization of the multi-orbital P-d model Hamiltonian within the unit cell and the perturbation theory in the Hubbard X-operators form for the inter-cell hopping and interactions. For undoped cuprates we obtain the valence band structure in excellent agreement with ARPES data, evolution of the band structure with doping with an in-gap state at small doping, impurity-like band at higher doping to optimally doped metal. The effective low-energy Hamiltonian has the form of singlet-triplet t-J model. For ruthenates the t-J-I model is proposed with both antiferromagnetic J and ferromagnetic I couplings. In the strong correlation limit, the mean-field theory of superconductivity results in d-wave singlet pairing mediated by J (cuprates) and p-wave triplet one mediated by I (ruthenates) with ratio T-c((d))/T-c((p)) similar to 100 due to the different symmetry of the gap. The competition of ferromagnetic and antiferromagnetic order in rutheno-cuprates is also discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Vasil'ev A. D., Zabluda V. N., Leont'ev A. A., Temerov V. L., Gudim I. A.
Заглавие : Violation of axial symmetry of optical properties in the trigonal crystal Nd:GdFe2.1Ga0.9(BO3)(4)
Коллективы : Russian Foundation for Basic Researches [07-02-00704]
Разночтения заглавия :авие SCOPUS: Violation of axial symmetry of optical properties in the trigonal crystal Nd:GdFe2.1Ga0.9(BO3)4
Место публикации : Phys. Lett. A: ELSEVIER SCIENCE BV, 2009. - Vol. 373, Is. 18-19. - P1683-1686. - ISSN 0375-9601, DOI 10.1016/j.physleta.2009.03.019
Примечания : Cited References: 16. - The work was supported by the Russian Foundation for Basic Researches, grant No 07-02-00704.
Предметные рубрики: IRON BORATE GDFE3(BO3)(4)
Ключевые слова (''Своб.индексиров.''): optical anisotropy--spectroscopy--rare earth compounds--transition metal compounds--optical anisotropy--rare earth compounds--spectroscopy--transition metal compounds
Аннотация: Strong dependence of birefringence and absorption spectra of d-d, f-f and charge transfer transitions on the direction of light beam in the plane perpendicular to the threefold crystallographic axis has been found out in trigonal crystal Nd:GdFe2.1Ga0.9(BO3)(4). X-ray measurements have shown that the crystal consists of inversion twins, whose formation is stimulated by the partial substitution of Fe by Ga. Observed violation of axial symmetry of the trigonal crystal optical properties is accounted for on the basis of assumption about stripe domain structure of the inversion twins. (c) 2009 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev A. D., Volkov N. V., Sapronova N. V., Sablina K. A., Vasilyev A. D.
Заглавие : Magnetic properties of MnGeO3 single crystals with orthorhombic structure
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2009. - Vol. 21, Is. 33. - Ст.336006. - ISSN 0953-8984, DOI 10.1088/0953-8984/21/33/336006
Примечания : Cited References: 10
Ключевые слова (''Своб.индексиров.''): anisotropy field--magnetic measurements--orthorhombic structures--orthorhombic symmetry--spin-flop transitions--two-sublattice models--crystal symmetry--crystallography--magnetic fields--magnetic properties--magnetic structure--single crystals
Аннотация: The current report is devoted to the further study of magnetic properties of MnGeO3 single crystals with orthorhombic symmetry Pbca. New data from magnetic measurements in magnetic fields up to 80 kOe are presented. A spin flop transition is observed at H-sf = 35 kOe and T = 4.2 K along the a-axis. The exchange and anisotropy fields are determined. The magnetic structure of MnGeO3 with T-N approximate to 36 K is qualitatively described using a two-sublattice model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chubukov A. V., Eremin I., Korshunov M. M.
Заглавие : Theory of Raman response of a superconductor with extended s-wave symmetry: Application to the iron pnictides
Коллективы : NSF [DMR 0604406]; Asian-Pacific Center for Theoretical Physics; Volkswagen Foundation [I/82203]; RMHE Program "Development of scientific potential" [N1 2.1.1/298.5]; RFBR [09-02-00127]
Разночтения заглавия :авие SCOPUS: Theory of Raman response of a superconductor with extended s -wave symmetry: Application to the iron pnictides
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2009. - Vol. 79, Is. 22. - Ст.220501. - ISSN 1098-0121, DOI 10.1103/PhysRevB.79.220501
Примечания : Cited References: 48. - We acknowledge useful conversations with G. Blumberg, W. Brenig, H.-Y. Choi, D. V. Efremov, A. Sacuto, M. Vavilov, and A. Vorontsov. A. V. C. acknowledges support from NSF (Contract No. NSF-DMR 0604406). I. E. acknowledges partial support from the Asian-Pacific Center for Theoretical Physics, the Volkswagen Foundation (Contract No. I/82203), and the RMHE Program "Development of scientific potential" (Contract No. N1 2.1.1/298.5). M. M. K. acknowledges support from RFBR (Grant No. 09-02-00127) and RAS program on "Low temperature quantum phenomena."
Предметные рубрики: LAYERED SUPERCONDUCTOR
SCATTERING
BA0.6K0.4FE2AS2
Аннотация: We argue that Raman study of Fe-pnictides is a way to unambiguously distinguish between various superconducting gaps proposed for these materials. We show that A(1g) Raman intensity develops a true resonance peak below 2 Delta if the pairing gap has A(1g) symmetry in the folded Brillouin zone (Delta(k=0)=Delta, Delta(pi, pi)=-Delta). No such peak develops for a pure s-wave gap, a d-wave gap, and an extended s-wave gap with Delta(k) =Delta cosk(x)/2cosk(y)/2. We show that the peak remains quite strong for the values of interpocket impurity scattering used to fit NMR data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Stanislavchuk T. N., Malkin B. Z., Bezmaternykh L. N.
Заглавие : Breaking of the Selection Rules for Optical Transitions in the Dielectric PrFe3(BO3)(4) Crystal by a Praseodymium-Iron Exchange Interaction
Коллективы : RFBR [07-02-01185, 07-02-00704]; Russian Academy of Sciences
Разночтения заглавия :авие SCOPUS: Breaking of the selection rules for optical transitions in the dielectric PrFe3(BO3)4 crystal by a praseodymium-iron exchange interaction
Место публикации : Phys. Rev. Lett.: AMER PHYSICAL SOC, 2009. - Vol. 102, Is. 18. - Ст.187403. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.102.187403
Примечания : Cited References: 26. - This work was supported in part by the RFBR under Grants No. 07-02-01185 and No. 07-02-00704 and by the Russian Academy of Sciences under the Programs for Basic Research.
Предметные рубрики: SINGLE-CRYSTAL
GDFE3(BO3)(4)
PHASE
DYFE3(BO3)(4)
SPECTRUM
LINES
Ключевые слова (''Своб.индексиров.''): magnetic ordering temperatures--optical spectrum--order parameters--point symmetries--selection rules--exchange interactions--neon--praseodymium--single crystals--crystal symmetry
Аннотация: We report on the emergence of new lines in the optical spectrum of the PrFe3(BO3)(4) single crystal at the magnetic ordering temperature. The transitions between singlet crystal-field sublevels of Pr3+ ion with the same transformational properties, strictly forbidden for the trigonal D-3 point symmetry of this ion in PrFe3(BO3)(4), appear below the Neel temperature and grow in intensity as a square of the order parameter. We show that the phenomenon originates from the mixing of wave functions of different Pr3+ sublevels by the Pr-Fe exchange interaction.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Kuz'min E. V., Ovchinnikov S. G.
Заглавие : Electronic structure and order parameter symmetry in high-temperature superconductors
Место публикации : Uspekhi Fiz. Nauk: MEZHDUNARODNAYA KNIGA, 2000. - Vol. 170, Is. 2. - P.189-192. - ISSN 0042-1294
Примечания : Cited References: 31
Предметные рубрики: CORRELATED ELECTRONS
HUBBARD-MODEL
OXIDES
LA2-XSRXCUO4
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prosnikov M. A., Smirnov A. N., Davydov, V. Yu, Sablina K. A., Pisarev R. V.
Заглавие : Lattice and magnetic dynamics of a quasi-one-dimensional chain antiferromagnet PbFeBO4
Коллективы : Russian Science Foundation [16-12-10456]
Место публикации : J. Phys.: Condens. Matter: IOP Publishing, 2017. - Vol. 29, Is. 2. - Ст.025808. - ISSN 0953-8984, DOI 10.1088/0953-8984/29/2/025808. - ISSN 1361-648X(eISSN)
Примечания : Cited References:32. - This research was supported by the Russian Science Foundation, grant No. 16-12-10456.
Предметные рубрики: LIGHT-SCATTERING
DIELECTRIC-PROPERTIES
RAMAN-SPECTROSCOPY
Ключевые слова (''Своб.индексиров.''): raman scattering--spin and phonon excitations--spin-phonon interaction--antiferromagnetism--magnetic symmetry analysis--two-magnon scattering
Аннотация: A group of recently synthesized orthorhombic Pnma crystals PbMBO4 (M = Cr, Mn, Fe) demonstrates a number of unusual structural and magnetic properties. We report on polarized Raman scattering study of the lattice and magnetic dynamics in single crystals of an antiferromagnet PbFeBO4 below and above T-N = 114 K. Polarization properties of the observed magnetic excitations below T-N as well as intense quasi-elastic scattering support the quasi-one-dimensional character of the magnetic structure of PbFeBO4. Frequency overlapping of magnetic excitations and low-frequency phonons in the range of 90-200 cm-1 leads to pronounced asymmetric anomalies thus confirming intrinsic coupling of magnetic and lattice subsystems. This conclusion is also supported by observation of anomalous temperature behaviour of higher frequency phonons in the vicinity of T-N. Experimental investigations are supported by relevant magnetic symmetry analysis which allows us to explain previously observed anomalous results.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Timofeev I. V., Vetrov S. Ya.
Заглавие : Chiral optical Tamm states at the boundary of the medium with helical symmetry of the dielectric tensor
Место публикации : JETP Letters. - 2016. - Vol. 104, Is. 6. - P.380-383. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364016180119
Примечания : Cited References: 7. - This work was performed within the framework of the state assignment from the Ministry of Education and Science of the Russian Federation for R&D at the Siberian Federal University (assignment no. 3.1276.2014/K).
Аннотация: A new optical state at the boundary of a chiral medium whose dielectric tensor has a helical symmetry is described analytically and numerically. The case of zero tangential wavenumber is considered. The state localized near the boundary does not transfer energy along this boundary and decreases exponentially with the distance from the boundary. The penetration of the field into the chiral medium is blocked at wavelengths corresponding to the photonic band gap and close to the pitch of the helix. The polarization of light near the boundary has the same sign of chirality as the helical symmetry. It is shown that the homogeneous environment or a substrate should exhibit anisotropic metallic reflection. The spectral manifestation of the state is determined by the angle between the optical axes of the media at the interface. A state at the interface between a cholesteric liquid crystal and an anisotropic metal–dielectric nanocomposite was considered as an example. © 2016, Pleiades Publishing, Inc.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Zyryanov V. Ya., Miskevich A. A.
Заглавие : Small-angle light scattering symmetry breaking in polymer-dispersed liquid crystal films with inhomogeneous electrically controlled interface anchoring
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 124, Is. 3. - P.388-405. - ISSN 1063-7761, DOI 10.1134/S1063776117020133. - ISSN 1090-6509(eISSN)
Примечания : Cited References:57. - This work was performed under the interacademic integration project between the National Academy of Sciences of Belarus and the Siberian Branch of the Russian Academy of Sciences and supported by the Belarus Republic Foundation for Fundamental Research (project no. F15SO-039). One of the authors (V.Ya.Z.) thanks the Russian Foundation for Basic Research and the Administration of the Krasnoyarsk Territory (project no. 16-42-240704).
Предметные рубрики: NEMATIC DROPLETS
BOUNDARY-CONDITIONS
IONIC MODIFICATION
ANGULAR
Аннотация: We have described the method of analyzing and reporting on the results of calculation of the small-angle structure of radiation scattered by a polymer-dispersed liquid crystal film with electrically controlled interfacial anchoring. The method is based on the interference approximation of the wave scattering theory and the hard disk model. Scattering from an individual liquid crystal droplet has been described using the anomalous diffraction approximation extended to the case of droplets with uniform and nonuniform interface anchoring at the droplet–polymer boundary. The director field structure in an individual droplet is determined from the solution of the problem of minimizing the volume density of the free energy. The electrooptical effect of symmetry breaking in the angular distribution of scattered radiation has been analyzed. This effect means that the intensities of radiation scattered within angles +θs and–θs relative to the direction of illumination in the scattering plane can be different. The effect is of the interference origin and is associated with asymmetry of the phase shift of the wavefront of an incident wave from individual parts of the droplet, which appears due to asymmetry of the director field structure in the droplet, caused by nonuniform anchoring of liquid crystal molecules with the polymer on its surface. This effect is analyzed in the case of normal illumination of the film depending on the interfacial anchoring at the liquid crystal–polymer interface, the orientation of the optical axes of droplets, their concentration, sizes, anisometry, and polydispersity.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Korshunov M. M., Togushova Yu. N., Shestakov V. A.
Заглавие : Spin-resonance peak in inelastic neutron scattering as a probe of gap symmetry in Fe-based superconductors
Коллективы : "Spectroscopies in Novel Superconductors", International Conference
Место публикации : Int. Conf. "Spectroscopies in Novel Superconductors (SNS-2016): book of abstracts. - 2016. - P.54
Примечания : We acknowledge partial support by RFBR (Grant RFBR 16-02-00098)
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berman G. P., Mankov Y. I., Sadreev A. F.
Заглавие : Stochastic-instability of classical homogeneous SU(2) by U(1) fields with spontaneously broken symmetry
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz. - 1985. - Vol. 88, Is. 3. - P.705-714. - ISSN 0044-4510
Примечания : Cited References: 19
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Zlotnikov A. O.
Заглавие : Anomalies in the characteristics of electronic structure upon a quantum phase transition to a state with two order parameters and the breaking of time-reversal symmetry
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2016. - Vol. 80, Is. 6. - P.616-619. - ISSN 10628738 (ISSN), DOI 10.3103/S106287381606040X
Примечания : Cited References: 9
Ключевые слова (''Своб.индексиров.''): antiferromagnetism--electronic structure--phase transitions--temperature distribution--antiferromagnetic order parameter--density of state--landau expansion--periodic anderson model--quantum phase transitions--temperature dependence--time reversal symmetries--two order parameters--quantum theory
Аннотация: Based on the periodic Anderson model, microscopic expressions for the Ginzburg–Landau expansion coefficients in a phase with superconducting and antiferromagnetic order parameters are obtained. Temperature dependences of the order parameters near the temperature of the transition to this phase are established. The emergence of anomalous properties upon the quantum phase transition to the phase with two order parameters is investigated. This transition is accompanied by drastic reconstruction of the density of states, reflected by the interplay between superconductivity and antiferromagnetism. © 2016, Allerton Press, Inc.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Korshunov M. M., Shestakov V. A., Togushova Yu. N.
Заглавие : Spin-resonance peak in iron-based superconductors as a probe of gap symmetry
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.I2.10. - P.131. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 8. - We acknowledge partial support by RFBR (Grant RFBR 16-02-00098)
Ключевые слова (''Своб.индексиров.''): iron-based superconductors--spin fluctuation pairing--spin-resonance peak--impurities
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Alekseev K. N., Cannon E. H., Kusmartsev F. V., Campbell D. K.
Заглавие : Fractional and unquantized dc voltage generation in THz-driven semiconductor superlattices
Место публикации : Europhys. Lett. - 2001. - Vol. 56, Is. 6. - P.842-848. - ISSN 0295-5075, DOI 10.1209/epl/i2001-00596-9
Примечания : Cited References: 40
Предметные рубрики: BLOCH OSCILLATIONS
SYMMETRY-BREAKING
ELECTRIC-FIELD
FREQUENCY
TRANSPORT
CHAOS
RESONANCES
RADIATION
Аннотация: We consider the spontaneous creation of a dc voltage across a strongly coupled semiconductor superlattice subjected to THz radiation. We show that the dc voltage may be approximately proportional either to an integer or to a half-integer multiple of the frequency of the applied ac field, depending on the ratio of the characteristic scattering rates of conducting electrons. For the case of an ac field frequency less than the characteristic scattering rates, we demonstrate the generation of an unquantized dc voltage.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Ovchinnikov S. G.
Заглавие : The effective Hamiltonian of the singlet-triplet model for copper oxides
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2001. - Vol. 43, Is. 3. - P416-419. - ISSN 1063-7834, DOI 10.1134/1.1356113
Примечания : Cited References: 15
Предметные рубрики: HIGH-TC SUPERCONDUCTORS
BAND-STRUCTURE
LA2-XSRXCUO4
MECHANISM
SYMMETRY
SPECTRUM
Аннотация: The effective Hamiltonian for a realistic multiband p-d model is developed. In the case of electron doping, the Hamiltonian coincides with that for the standard t-J model. For hole doping, the singlet-triplet t-J model takes place. (C) 2001 MAIK "Nauka/Interperiodica".
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Misyul' S. V., Bovina A. F., Afanas'ev M. L.
Заглавие : Polarization-optical and X-ray diffraction investigations on the symmetry of distorted phases of ammonium cryolite (NH4)(3)ScF6
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2000. - Vol. 42, Is. 2. - P345-349. - ISSN 1063-7834, DOI 10.1134/1.1131210
Примечания : Cited References: 12
Предметные рубрики: TRANSITIONS
Аннотация: Single-crystal plates of different sections of the (NH4)(3)ScF6 crystal have been investigated by polarization-optical microscopy and X-ray diffraction over a wide temperature range, including the temperatures of two known phase transitions and the third transition found recently. It is established that the symmetry of phases changes in the following sequence: O-h(5) - Fm3m (Z = 4) ↔ C-2h(5) - P12(1)/n1 (Z = 2)↔ C-2h(3) -I12/m1 (Z = 16) ↔ C-i(1) - I (l) over bar (Z = 16). (C) 2000 MAIK "Nauka/Interperiodica".
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Misyul' S. V., Bovina A. F., Afanas'ev M. L.
Заглавие : Optical and x-ray diffraction investigations of the symmetry of distorted phases of the (NH4)(2)KGaF6 crystal
Разночтения заглавия :авие SCOPUS: Optical and x-ray diffraction investigations of the symmetry of distorted phases of the (NH4)2KGaF6 crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2002. - Vol. 44, Is. 10. - P1967-1971. - ISSN 1063-7834, DOI 10.1134/1.1514789
Примечания : Cited References: 10
Предметные рубрики: THERMODYNAMIC PROPERTIES
TRANSITION
Аннотация: Powders and single-crystal plates of different sections of an (NH4)(2)KGaF6 crystal are investigated using polarized light microscopy and x-ray diffraction over a wide temperature range, including the phase transition temperatures. It is established that the sequence of symmetry changes in the crystal under investigation is as follows: O-h(5)-Fm3m (Z = 4) ↔ C-4h(5)-I114/m (Z = 2) ↔ C-2h(5)-P112(1)/n (Z = 2). (C) 2002 MAIK "Nauka/Interperiodica".
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Burriel R., Gorev M. V., Isla P., Voronov V. N.
Заглавие : Low-temperature specific heat of the Rb2KScF6 elpasolite
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 1. - P167-170. - ISSN 1063-7834, DOI 10.1134/1.1537430
Примечания : Cited References: 9
Предметные рубрики: PHASE-TRANSITIONS
CRYOLITE (NH4)(3)SCF6
DISTORTED PHASES
SYMMETRY
Аннотация: The specific heat of single-crystal Rb2KScF6 is measured using ac calorimetry in the range 4-280 K. The results are discussed in the context of a group-theoretical analysis of possible distortions of the elpasolite structure and of experimental data obtained earlier with an adiabatic calorimeter in a narrower temperature region. (C) 2003 MAIK "Nauka/Interperiodica".
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