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1.
Structural phase transitions
and photoluminescence properties of Eu3+ doped Ca(2-x)BaxLaNbO6 phosphors / J. Zhu [et al.]> // Dalton Trans. - 2015. -
Vol. 44
,
Is. 42
. - P. 18536-18543,
DOI
10.1039/c5dt03430b. - Cited References: 27. - The present work was supported by the National Natural Science Foundation of China (Grant No. 51272027, 51472028 and 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306) . - ISSN 1477-9226
Перевод заглавия:
Структурные фазовые переходы и фотолюминесцентные свойства люминофоров Ca(2-x)BaxLaNbO6 допированных Eu3+
РУБ
Chemistry, Inorganic & Nuclear
Рубрики:
Double-perovskite
Luminescence properties
Thermal-stability
Crystal-chemistry
Red phosphors
White LEDs
Symmetry
Band
Ta
Ln
Аннотация:
Crystal structures of the series of double perovskites Ca(2-x)BaxLaNbO6:Eu3+ phosphors have been examined by powder X-ray diffraction and Rietveld refinements. Ca2LaNbO6 has a monoclinic (P21/n) and Ba2LaNbO6 has a monoclinic (C2/m) structure. The structural phases of Ca(2-x)BaxLaNbO6:Eu3+ samples are divided into three sections depending on different Ca/Ba ratios: (1) monoclinic phase (P21/n) as Ca2LaNbO6 in the range of x = 0-0.1, (2) mixed phases containing Ca2LaNbO6 and Ba2LaNbO6 between 0.15 and 1.2, and (3) monoclinic phase (C2/m) as Ba2LaNbO6 for x = 1.4-2. Eu3+ ions act as the structural probes to study the structural phase transitions, and the evolution of the photoluminescence properties and thermal stability behaviours has been also comparatively investigated depending on different structural symmetries from Ca2LaNbO6 to Ba2LaNbO6 phase. The strong red emission from 5D0-7F2 peaking at 618 nm can be found in Ca2LaNbO6:Eu3+ phosphors, which is attributed to the low crystal field effect of the activator ions located in the highly distorted [Lao8] polyhedra sites. The composition-optimized phosphors can find applications in white light emitting diodes (LEDs).
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Держатели документа:
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, China
School of Materials Sciences and Technology, China University of Geosciences, Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Доп.точки доступа:
Zhu, J.; Xia, Zhiguo; Zhang, Y.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Q.
}
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2.
Shneyder, E. I.
Isotope effect in the model of strongly correlated electrons with the magnetic and phonon superconducting pairing mechanisms / E. I. Shneyder, S. G. Ovchinnikov> // J. Exp. Theor. Phys. - 2009. -
Vol. 109
,
Is. 6
. - P. 1017-1021,
DOI
10.1134/S1063776109120139. - Cited References: 42. - This study was financed under programs 5.7 and "Quantum Physics of Condensed Matter" of the Presidium of the Russian Academy of Sciences, integration project no. 40 of the Siberian Branch and Ural Division of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 09-02-00127). . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
CUPRATE SUPERCONDUCTORS
PHASE-TRANSITIONS
3-CENTER INTERACTIONS
HUBBARD-MODEL
TEMPERATURE
LA2-XSRXCUO4
SYMMETRY
EXCHANGE
COPPER
BI2SR2CACU2O8+DELTA
Кл.слова (ненормированные):
Ab initio calculations
--
Calculated values
--
Cooper pairing
--
Isotope effect
--
Magnetic mechanisms
--
Order of magnitude
--
Pairing mechanism
--
Phonon mechanism
--
Strongly correlated electrons
--
Superconducting pairing mechanism
--
Superconducting state
--
Type theory
--
Carrier mobility
--
Electron-phonon interactions
--
Isotopes
--
Superconductivity
--
Superconducting magnets
Аннотация:
Peculiarities of the temperature isotope effect in a BCS-type theory describing the exchange and phonon mechanisms of Cooper pairing in a system of strongly correlated electrons are considered. The electron-phonon interaction constant is determined from the fitting of the calculated value of the isotope-effect index to the observed value with the parameters of La(2 - x) Sr (x) CuO(4) obtained from ab initio calculations. The value of this constant indicates that the contribution from the traditional pairing mechanism to the superconducting state is of the same order of magnitude as the contribution from the magnetic mechanism.
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Публикация на русском языке
Шнейдер, Елена Игоревна. Изотопический эффект в модели сильно коррелированных электронов, учитывающей магнитный и фононный механизмы сверхпроводящего спаривания [Текст] / Е. И. Шнейдер, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 2009. - Т. 136 Вып. 6. - С. 1177-1182
Держатели документа:
[Shneyder, E. I.
Ovchinnikov, S. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Shneyder, E. I.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, 660014, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Шнейдер, Елена Игоревна; Presidium of the Russian Academy of Sciences [40]; Russian Academy of Sciences; Russian Foundation for Basic Research [09-02-00127]
}
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3.
Raman scattering study
of temperature induced phase transitions in crystalline ammonium heptafluorozirconate, (NH4)3ZrF7 / A. S. Krylov [et al.]> // Vib. Spectrosc. - 2012. -
Vol. 62
. - P. 258-263,
DOI
10.1016/j.vibspec.2012.07.003. - Cited References: 31. - This work was partly supported by integration project SB RAS No 28, Russian Foundation for Basic Research project No 11-02-98002-r_siberia, No 12-02-00056, SS-4828.2012.2. The authors are grateful to Dr. I.N. Flerov for helpful discussions. The assistance of Dr. S. Skokov is sincerely appreciated. . - ISSN 0924-2031
РУБ
Chemistry, Analytical + Chemistry, Physical + Spectroscopy
Рубрики:
VIBRATIONAL-SPECTRA
X-RAY
DISORDER
DIFFRACTION
ELPASOLITE
SYMMETRY
RB2KSCF6
IF7
Кл.слова (ненормированные):
Raman spectroscopy
--
Phase transition
--
Ammonium heptafluorozirconate
--
Low temperature
Аннотация:
This paper reports on a Raman spectroscopy investigation of phase transitions in (NH4)3ZrF7 crystal. Raman spectra were obtained and analyzed in a wavenumber range from 3800 to 15 cm−1 and in the temperature range from 7 to 360 K. The anomalies caused by a series of subsequent structural phase transitions have been analyzed. A soft phonon mode restoring in the distorted phase was found. The spectral changes observed in the current study are similar to those typically found in phase transitions near a tricritical point. The spectral changes in the middle wavenumber range, 700–150 cm−1, indicate that the phase transitions are due to structural ordering of pentagonal ZrF73− bipyramids. Spectral data also show that a phase transition near 225 K is accompanied by an increase of the unit cell volume. In addition, spectral changes in the range of internal vibrations of ammonium ions indicate that the ion's motion slows down with decrease of temperature.
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Держатели документа:
[Krylov, A. S.
Krylova, S. N.
Vtyurin, A. N.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Vladivostok 690022, Russia
Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Laptash, N. M.; Vtyurin, A. N.; Втюрин, Александр Николаевич
}
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4.
Ovchinnikov, S. G.
The Interplay of Phonon and Magnetic Mechanism of Pairing in Strongly Correlated Electron System of High-T-c Cuprates / S. G. Ovchinnikov, E. I. Shneyder> // J. Supercond. Nov. Magn. - 2010. -
Vol. 23
,
Is. 5
. - P. 733-736,
DOI
10.1007/s10948-009-0633-z. - Cited References: 26. - This work is supported by the Presidium RAS program N 7 "Quantum physics of condensed matter," the integration project SORAN-UrORAN N 40, and the RFFI Grant 09-02-00127. . - ISSN 1557-1939
РУБ
Physics, Applied + Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
OXIDE SUPERCONDUCTORS
SYMMETRY
COPPER
MODEL
BAND
BI2SR2CACU2O8+DELTA
LA2-XSRXCUO4
PB
Кл.слова (ненормированные):
High-T-c superconductivity
--
Strong correlated electron systems
--
Mechanisms of superconducting pairing
--
High-T c superconductivity
--
Mechanisms of superconducting pairing
--
Strong correlated electron systems
--
Ab initio
--
Buckling mode
--
Correlated electron systems
--
Critical temperatures
--
Cuprates
--
Fitting parameters
--
High-T
--
Isotope effect
--
Low energies
--
Magnetic mechanisms
--
Order of magnitude
--
Phonon mode
--
Strongly correlated electron system
--
Strongly correlated electrons
--
Superconducting pairing
--
Superconductivity mechanism
--
Type theory
--
Buckling
--
Copper compounds
--
Electrons
--
Isotopes
--
Magnetic materials
--
Phonons
--
Superconductivity
--
Superconducting magnets
Аннотация:
We consider magnetic mechanism of superconducting pairing in the effective low energy t - t' - t '' - J* model with all parameters calculated ab initio. Interaction of strongly correlated electrons with different phonon modes is also incorporated. In a BCS type theory, the d(x2-y2) gap is given by a sum of magnetic and phonon contributions. The main contribution to the only fitting parameter G is determined by a competition of the breathing and buckling modes. Fitting the parameter G from the isotope effect, we obtain that magnetic and phonon contributions to the critical temperature T-c work together and are of the same order of magnitude.
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Держатели документа:
[Ovchinnikov, S. G.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, 660041 Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, 660014 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
}
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5.
Mel'nikova, S. V.
Phase transitions in the oxyfluoride (NH4)(3)NbOF6 / S. V. Mel'nikova, N. M. Laptash, A. L. Zhogal'> // Phys. Solid State. - 2007. -
Vol. 49
,
Is. 5
. - P. 958-962,
DOI
10.1134/S1063783407050253. - Cited References: 11 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
RAY-DIFFRACTION INVESTIGATIONS
DISTORTED PHASES
SYMMETRY
DISORDER
CRYSTAL
Аннотация:
(NH4)(3)NbOF6 single crystals were grown, polarization-optical studies were performed, and birefringence was measured over the temperature range 90-500 K. A sequence of first-order structural phase transitions was found at temperatures T (1 down arrow) = 259.7 K and T (2 down arrow) = 257.7 K with temperature hysteresis delta T-1 = 0.9 K and delta T-2 = 1.9 K. The transitions are accompanied by twinning and the following change in the crystal
symmetry
: cubic paired left right arrows tetragonal paired left right arrows monoclinic. Optical second harmonic generation is found to occur at room temperature, which indicates that the cubic phase is not centrosymmetric. It is assumed that the phase transitions are ferroelastic and ferroelectric in nature.
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Публикация на русском языке
Мельникова, Светлана Владимировна. Фазовые переходы в оксифториде (NH4)3NbOF6 [Текст] / С. В. Мельникова, Н. М. Лапташ, А. Л. Жогаль // Физ. тверд. тела. - Т. 49 № 5. - С. 908-912
Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russian Federation
Доп.точки доступа:
Laptash, N. M.; Zhogal', A. L.; Мельникова, Светлана Владимировна
}
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6.
Low-temperature specific heat
of the Rb2KScF6 elpasolite / I. N. Flerov [et al.]> // Phys. Solid State. - 2003. -
Vol. 45
,
Is. 1
. - P. 167-170,
DOI
10.1134/1.1537430. - Cited References: 9 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
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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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Zaragoza, CSIC, Inst Sci Mat Aragon, E-50009 Zaragoza, Spain
ИФ СО РАН
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Inst. de Sciencia de Mat. de Aragon, CSIC, Universidad de Zaragoza, Zaragoza 50009, Spain
Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Burriel, R.; Gorev, M. V.; Горев, Михаил Васильевич; Isla, P.; Voronov, V. N.; Воронов, Владимир Николаевич
}
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7.
Korshunov, M. M.
The effective Hamiltonian of the singlet-triplet model for copper oxides / M. M. Korshunov, S. G. Ovchinnikov> // Phys. Solid State. - 2001. -
Vol. 43
,
Is. 3
. - P. 416-419,
DOI
10.1134/1.1356113. - Cited References: 15 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
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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Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk 660062, Russia
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Krasnoyarsk State University, Krasnoyarsk, 660062, Russian Federation
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Коршунов, Максим Михайлович
}
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8.
Korshunov, M. M.
Effective Hamiltonian and the properties of normal and superconductive phases of n-type cuprates / M. M. Korshunov, S. G. Ovchinnikov, A. V. Sherman> // Physica B. - 2005. -
Vol. 359
: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P. 521-523,
DOI
10.1016/j.physb.2005.01.134. - Cited References: 13 . - ISSN 0921-4526
РУБ
Physics, Condensed Matter
Рубрики:
MODEL
SYMMETRY
Кл.слова (ненормированные):
strong electron correlations
--
superconductivity
--
multiband p-d model
--
n-type cuprates
--
Multiband p-d model
--
n-type cuprates
--
Strong electron correlations
--
Superconductivity
--
Antiferromagnetism
--
Correlation theory
--
Fermi surface
--
Hamiltonians
--
Mathematical models
--
Microscopic examination
--
Oxide superconductors
--
Phase diagrams
--
Semiconductor doping
--
Generalized tight-binding (GTB)
--
Multiband p-d models
--
N-type cuprates
--
Single electron correlations
--
Superconductivity
Аннотация:
In the framework of the effective low-energy model for high-T-c, cuprates with account for three-center interaction terms and spin fluctuations the properties of normal and superconducting phases of n-type cuprates are investigated. Microscopic model parameters were obtained from ARPES data in undoped compounds. Obtained evolution of the chemical potential with doping, Fermi surface at optimal doping, and T-c(x) phase diagram are in remarkably good agreement with the experiment. (c) 2005 Elsevier B.V. All rights reserved.
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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia
ИФ СО РАН
LV Kirensky Institute of Physics, Siberian Br. of Russ. Acad. of Sci., Krasnoyarsk, 660036, Russian Federation
Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Sherman, A. V.; Коршунов, Максим Михайлович
}
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9.
Korshunov, M. M.
Effective hamiltonian and properties of the normal and superconducting phases of n-type cuprates / M. M. Korshunov, S. G. Ovchinnikov, A. V. Sherman> // JETP Letters. - 2004. -
Vol. 80
,
Is. 1
. - P. 39-43,
DOI
10.1134/1.1800212. - Cited References: 32 . - ISSN 0021-3640
РУБ
Physics, Multidisciplinary
Рубрики:
T-J MODEL
ORDER-PARAMETER
QUASI-PARTICLES
COPPER OXIDES
FERMI-SURFACE
ELECTRON
SYMMETRY
RANGE
ND1.85CE0.15CUO4
TRANSITIONS
Аннотация:
An effective low-energy Hamiltonian is derived from a microscopic multiband p-d model in the regime of strong electron correlations. The parameters of the p-d model are determined by comparison with the ARPES data for undoped Nd2CuO4. The Hamiltonian is the t-J* model in which hopping and exchange slowly decay with distance and are taken into account up to the fifth coordination sphere. The quasiparticle band structure is calculated as a function of the doping concentration with regard to short-range magnetic order, and the superconductivity theory with the spin-fluctuation pairing mechanism is constructed. Assuming that the parameters of the model do not depend on the doping level, we obtained quantitative agreement with the properties observed experimentally for the normal and superconducting phases without introducing fitting parameters. (C) 2004 MAIK "Nauka / Interperiodica".
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Institute of Physics, University of Tartu, Tartu, 51014, Estonia
Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Sherman, A. V.; Коршунов, Максим Михайлович
}
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10.
Komogortsev, S. V.
Magnetization curve and magnetic correlations in a nanochain of ferromagnetic grains with random anisotropy / S. V. Komogortsev, R. S. Iskhakov> // Phys. Solid State. - 2005. -
Vol. 47
,
Is. 3
. - P. 495-501,
DOI
10.1134/1.1884711. - Cited References: 31 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
NANOCRYSTALLINE FERROMAGNETS
AMORPHOUS FERROMAGNETS
FIELD
MODEL
MICROSTRUCTURE
SIMULATIONS
DEPENDENCE
SYMMETRY
SYSTEM
MEDIA
Аннотация:
The magnetization curve and magnetization correlation function are calculated for a ferromagnetic chain of single-domain nanoparticles with a randomly oriented anisotropy axis for different ratios between the exchange correlation and anisotropy energies. It is shown that the coercive force decreases as the exchange correlations increase. For strong exchange correlations, the magnetization curve is described by the following three successive magnetization processes as the applied field is increased: (i) nonuniform rotation of the magnetization of stochastic domains, (ii) collapse of the magnetic solitons, and (iii) nonuniform rotation of exchange-correlated magnetization vectors of the nanoparticles. For high fields, the calculated correlation function of the transverse magnetization components coincides with that predicted from linear theory. At low and zero fields, the main parameters of the correlation function (the variance and correlation radius) tend to certain finite values rather than diverge (as is the case in linear theory). The irreversible variation in the magnetization at low fields (the hysteresis loop) and the hysteresis of the main parameters of the correlation function are calculated. (c) 2005 Pleiades Publishing, Inc.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Комогорцев, Сергей Викторович
}
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11.
Gavrichkov, V. A.
Doping dependent electronic structure of cuprates and the effective low energy Hamiltonian for the magnetic pairing / V. A. Gavrichkov, M. M. Korshunov, S. G. Ovchinnikov> //
Int. J. Mod. Phys. B. - 2005. -
Vol. 19
,
Is. 1-3
. - P. 247-249,
DOI
10.1142/S0217979205028335. - Cited References: 14 . - ISSN 0217-9792
РУБ
Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
COPPER OXIDES
SYMMETRY
MODEL
Кл.слова (ненормированные):
electronic structure
--
strong electron correlations
--
magnetic mechanism of pairing
--
Electronic structure
--
Magnetic mechanism of pairing
--
Strong electron correlations
--
copper derivative
--
calculation
--
chemical reaction
--
chemical structure
--
conference paper
--
correlation analysis
--
electron
--
electronics
--
energy
--
hybridization
--
intermethod comparison
--
magnetism
--
mathematical analysis
--
mathematical model
Аннотация:
The properties of the normal and superconducting phases of p- and n-type cuprates are investigated in the appropriate low-energy models in the approximation beyond Hubbard I considering spin fluctuations. Calculated chemical potential dependence on doping, Fermi surface and T,(x) phase diagram for n-type cuprates are in remarkably good agreement with the experimental ones. Comparison of the singlet-triplet t-J model with simple t-J model shows that the spin-exciton mechanism originated from singlet-triplet hybridization leads to small contribution to the T-c(x) - optimal doping value becomes slightly lower and the maximum value of T-c become slightly higher.
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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirensky Inst. Phys. S., Russian Academy of Science, Akademgorodok, 660036, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович; International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials(5 ; 2004 ; June ; 11-16 ; Chongqing, China)
}
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12.
Ferromagnetism and strong
magnetic anisotropy of the PbMnBO4 orthoborate single crystals / A. Pankrats [et al.]> // J. Magn. Magn. Mater. - 2016. -
Vol. 414
. - P. 82-89,
DOI
10.1016/j.jmmm.2016.04.042. - Cited References: 20. - We acknowledge the assistance of A. Dubrovsky in magnetic measurements. - This work was supported by the Russian Foundation for Basic Research, Projects nos. 13-02-00897 and 16-02-00563. MVE thanks for support the Russian Government Program of Competitive Growth of the Kazan Federal University, decision no. 930_p, May 22, 2015. . - ISSN 0304-8853
РУБ
Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
PbMBO4 M
Resonance
Symmetry
Mn
Fe
Cr
Кл.слова (ненормированные):
Strong ferromagnetic anisotropy
--
Ferromagnetic resonance
--
Exchange interactions
Аннотация:
The PbMnBO4 orthoborate single crystals were first grown and their magnetic properties and ferromagnetic resonance were studied. It was found that the ferromagnetic state below the Curie temperature TC=31 K is characterized by the strong magnetic anisotropy. The significant effective anisotropy fields of PbMnBO4 determine the energy gap in the FMR spectrum, which is extraordinary large for ferromagnets (112 GHz at T=4.2 K). It was shown that the static Jahn-Teller effect characteristic of the Mn3+ ion leads to both the ferromagnetic ordering and the strong magnetic anisotropy in the crystal. In the strong external magnetic field the induced ferromagnetic ordering is retained in the crystal above the Curie temperature up to the temperatures multiply higher than TC. A weak anomaly of the dielectric permittivity was observed in PbMnBO4 at the Curie temperature at which the long-range ferromagnetic order is established. © 2016 Elsevier B.V. All rights reserved.
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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Physics, Kazan Federal University, Kazan, Russian Federation
Доп.точки доступа:
Pankrats, A. I.; Панкрац, Анатолий Иванович; Sablina, K. A.; Саблина, Клара Александровна; Eremin, M.; Balaev, A. D.; Балаев, Александр Дмитриевич; Kolkov, M.; Колков, Максим Игоревич; Tugarinov, V. I.; Тугаринов, Василий Иванович; Bovina, A. F.; Бовина, Ася Федоровна
}
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13.
Effective parameters of
the band dispersion in n-type high-T-c superconductors / M. M. Korshunov [et al.]> // Physica C. - 2004. -
Vol. 402
,
Is. 4
. - P. 365-370,
DOI
10.1016/j.physc.2003.10.017. - Cited References: 32 . - ISSN 0921-4534
РУБ
Physics, Applied
Рубрики:
DOPED CUPRATE SUPERCONDUCTORS
TIGHT-BINDING METHOD
QUASI-PARTICLES
COPPER OXIDES
LA2-XSRXCUO4
SYMMETRY
MODEL
EVOLUTION
ORDER
Кл.слова (ненормированные):
high-T-c superconductivity
--
electronic correlations
--
electron-doped cuprates
--
Electron-doped cuprates
--
Electronic correlations
--
High-Tc superconductivity
--
Approximation theory
--
Atomic physics
--
Band structure
--
Binding energy
--
Charge transfer
--
Correlation methods
--
Doping (additives)
--
Electronic structure
--
Hamiltonians
--
Mathematical models
--
Mathematical operators
--
Oxide superconductors
--
Perturbation techniques
--
Photoelectron spectroscopy
--
Atomic orbitals
--
Conduction band
--
Electron doped cuprates
--
Electron spins
--
Valence band
--
High temperature superconductors
Аннотация:
The electronic structure of electron-doped cuprates is discussed in the regions of small and optimal doping. For optimal doping we obtain the parameters from a simple tight-binding analysis by fitting ARPES data, and for small doping we study the band structure by the generalized tight-binding method that takes strong electronic correlations into account explicitly. This method has also reproduced well the ARPES data for small doping. The effective low-energy Hamiltonian is the t-t'-J model with hopping parameters t and t'. We compare both methods and find very good agreement for the value of t while t' is different because it is caused by the different contribution of the short-range spin correlations. (C) 2003 Elsevier B.V. All rights reserved.
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Держатели документа:
Free Univ Berlin, Inst Theoret Phys, D-14195 Berlin, Germany
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Science, Krasnoyarsk 660036, Russian Federation
Inst. fur Theoretische Physik, Freie Universitat Berlin, Arnimallee 14, D-14195 Berlin, Germany
Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Manske, D.; Eremin, I.
}
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14.
Computation of effective
elastic constants in anisotropic microseamy rocks / G. T. Prodaivoda [и др.]> // Geol. Geofiz. - 2000. -
Vol. 41
,
Is. 3
. - P. 436-449. - Cited References: 25 . - ISSN 0016-7886
Рубрики:
WAVE-PROPAGATION
SYMMETRY
Кл.слова (ненормированные):
anisotropy
--
modeling
--
orientation of microcracks
--
elastic waves
Аннотация:
A generalized method of conditional moments for computation of effective elastic constants of anisotropic rocks with spatially oriented microcracks is considered. The method involves an additional operation of averaging of known solution data for a modeled rock of orthorhombic structure with ellipsoidal microcracks whose semiaxes are oriented along the coordinate axes. The averaging is performed using the distribution function of rock microcrack orientations, which is expanded into a series in terms of generalized spherical functions. The expansion coefficients are determined by an experiment. In calculating the effective elastic constants of anisotropic rocks, there are no constraints on the concentration of microcracks. We have studied the parameters of azimuthal anisotropy of elastic-wave velocities in modeled amphibolites with ellipsoidal hornblende grains oriented along the coordinate axes and with three-planar and spatially oriented systems of microcracks. The obtained results agree with experimental data of ultrasonic determinations of elastic constants for amphibolite samples.
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Публикация на русском языке
Метод расчета эффективных упругих постоянных в анизотропных микротрещиноватых горных породах [Текст] / Г. Т. Продайвода [и др.] // Геол. и геофиз. - 2000. - Т. 41 № 3. - С. 436-449
Держатели документа:
Univ Kiel, UA-252022 Kiev, Ukraine
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Natl Acad Sci Ukraine, Inst Mech, UA-252017 Kiev, Ukraine
ИФ СО РАН
Доп.точки доступа:
Prodaivoda, G. T.; Продайвода, Георгий Трофимович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Vyzhva, S. A.; Nazarenko, L. V.
}
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15.
Aplesnin, S. S.
Quantum spin liquid in the 2D anisotropic Heisenberg model with frustrated next nearest neighbor exchange / S. S. Aplesnin> // Low Temp. Phys. - 1998. -
Vol. 24
,
Is. 8
. - P. 572-577 ; Физика низких температур,
DOI
10.1063/1.593639. - Cited References: 25 . - ISSN 1063-777X
РУБ
Physics, Applied
Рубрики:
SQUARE-LATTICE ANTIFERROMAGNETS
VALENCE BOND STATES
SYSTEMS
SUPERCONDUCTIVITY
SYMMETRY
Аннотация:
The two-dimensional (2D) Heisenberg model with anisotropic exchange (Delta = 1 - J(x)/J(z)) and with negative next nearest neighbor exchange (J(2)) with S = 1/2 is investigated by using the quantum-mechanical Monte-Carlo method. The energy, magnetic moment at a site, heat capacity, and spin-spin correlation functions are calculated. The stability regions for Neel ordering of spins as well as the strip-phase and gapless quantum spin liquid are determined in the interval Delta/2 less than or equal to J(2)/ J(1)less than or equal to 1/(2 Delta). (C) 1998 American Institute of Physics. [S1063-777X(98)00808-1].
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Держатели документа:
Russian Acad Sci, LV Kirenskii Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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16.
Aleksandrov, K. S.
Phase-transitions and distortions of the structure in the family of crystals related to alpha-k2so / K. S. Aleksandrov> // Kristallografiya. - 1993. -
Vol. 38
,
Is. 1
. - P. 128-139 ; Crystallogr. Rep. - Cited References: 38 . - ISSN 0023-4761
Рубрики:
X-RAY
EXPECTED STRUCTURES
A2BX4 COMPOUNDS
TEMPERATURE
(NH4)2BEF4
CHEMISTRY
DISORDER
SYMMETRY
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Публикация на русском языке
Александров, Кирилл Сергеевич. Фазовые переходы и искажения структуры в семействе кристаллов родственных α – K2SO4. [Текст] / К. С. Александров // Кристаллография. - 1993. - Т. 38 Вып. 1. - С. 128-139
Доп.точки доступа:
Александров, Кирилл Сергеевич
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