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High-temperature magnetoelectricity of terbium aluminum borate: The role of excited states of the rare-earth ion / A. M. Kadomtseva [et al.] // Phys. Rev. B. - 2014. - Vol. 89, Is. 1. - Ст. 014418, DOI 10.1103/PhysRevB.89.014418. - Cited References: 25. - We thank Dr. Daniel Sando for useful comments and remarks. This work is supported by the Russian Foundation for Basic Research (Projects No. 13-02-01093, No. 13-02-12443, No. 13-02-01093, No. 12-02-01261, and No. 13-02-12442) and a grant from the Russian Federation President on support of sciences schools no. 4828.2012.2, The Ministry of Education and Science of Russian Federation, Project No. 8365. . - ISSN 1098-0121. - ISSN 1550-235X

РУБ Physics, Condensed Matter
Рубрики:
GROUND-STATE
PRFE3(BO3)4
MULTIFERROICS
Аннотация: Recently discovered magnetoelectricity in the rare-earth aluminum borates RAl3(BO3)4 has attracted attention due to the large values of magnetoinduced electric polarization. We have observed for the first time the magnetoelectric polarization in TbAl3(BO3)4 exhibiting anomalous temperature dependence: an electric polarization induced by in-plane magnetic field (P||a,H⊥c axis) which is small at low temperatures (4K), remarkably increases by almost an order of magnitude at high temperatures (150–300K). The observed nonmonotonic temperature behavior of the field-induced polarization, including a change of sign at ∼65–70K, is attributed to the competition of the ground and excited crystal-field states of Tb3+ ions. Quantum theory analysis, involving the combination of analytical and numerical methods, has enabled us to quantitatively describe the observed magnetic and magnetoelectric properties of TbAl3(BO3)4.
Недавно обнаруженное магнетоэлектричество в редкоземельных алюмоборатах RAl3 (BO3) 4 привлекло к себе внимание из-за больших значений магнитоиндуцированной электрической поляризации. Мы наблюдали в первый раз магнитоэлектрическую поляризацию в TbAl3 (BO3) 4, показывающую аномальную температурную зависимость: электрическая поляризация индуцируется в плоскости магнитного поля (Р | |, Н ⊥ оси с), и является небольшой при низких температурах (4K), Значительно увеличивается, почти на порядок величины, при высоких температурах (150-300 К). Наблюдаемая с изменением температуры немонотонность поляризации от поля, в том числе изменению знака на ~ 65-70 К, может быть отнесена к конкуренции между основном и возбужденном кристаллическим полем состояниями ионов ТЬ3 +. Теория квантового анализа, предполагающей сочетание аналитических и численных методов, позволила нам количественно описать наблюдаемые магнитные и магнитоэлектрические свойства TbAl3 (BO3) 4.

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Держатели документа:
Moscow MV Lomonosov State Univ, MSU, Dept Phys, Moscow 119992, Russia
Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow, Russia
State Univ, Moscow Inst Phys & Technol, Moscow, Russia
Natl Res Univ Elect Technol MIET, Zelenograd, Russia
RAS, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Kadomtseva, A. M.; Popov, Y. F.; Vorob'ev, G. P.; Kostyuchenko, N. V.; Popov, A. I.; Mukhin, A. A.; Ivanov, V. Y.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Temerov, V. L.; Темеров, Владислав Леонидович; Pyatakov, A. P.; Zvezdin, A. K.; Russian Foundation for Basic Research [13-02-12443, 13-02-01093, 12-02-01261, 13-02-12442]; Russian Federation President on support of sciences schools [4828.2012.2]; Ministry of Education and Science of Russian Federation [8365]
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    Coupling between phonon and crystal-field excitations in multiferroic PrFe3(BO3)4 / K. N. Boldyrev [et al.] // Phys. Rev. B. - 2014. - Vol. 90, Is. 12. - Ст. 121101, DOI 10.1103/PhysRevB.90.121101. - Cited References: 35. - This research was supported by the Russian Scientific Foundation under Grant No. 14-12-01033, the President of Russian Federation (MK-1700.2013.2; K.N.B.), and the U.S. Department of Energy under Grant No. DE-FG02-07ER46382 (experiments at U4-IR beamline NSLS-BNL; T.N.S. and A.A.S.). The National Synchrotron Light Source is operated as a User Facility for the U.S. Department of Energy under Contract No. DE-AC02-98CH10886. M.N.P. thanks B. Z. Malkin for drawing her attention to the work [33] and for helpful discussions. . - ISSN 1098-0121. - ISSN 1550-235X
   Перевод заглавия: Взаимодействие между фононами и возбуждениями кристаллического поля в мультиферроике PrFe3(BO3)4

РУБ Physics, Condensed Matter
Рубрики:
MAGNETOELECTRIC PROPERTIES
GROUND-STATE
SM
Аннотация: Far-infrared reflection and ellipsometry measurements on multiferroic PrFe3(BO3)4 and SmFe3(BO3)4 single crystals were used to investigate the interaction between lattice phonons and electronic excitations associated with 4f crystal-field transitions. A temperature-dependent interference between two types of excitations was observed in PrFe3(BO3)4 in which the frequency of 4f crystal-field electronic excitation of Pr3+ falls into the TO-LO frequency interval of the optical phonon mode near 50 cm−1 (1.5 THz). Experimental data were explained on the basis of a theoretical model of coupled electron-phonon modes. The fitting procedure revealed the value 14.8 cm−1 for the electron-phonon coupling constant. This rather large value points to an essential role played by the electron-phonon interaction in the physics of multiferroics.

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Держатели документа:
RAS, Inst Spect, Troitsk 142190, Russia
New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Boldyrev, K. N.; Stanislavchuk, T. N.; Sirenko, A. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Popova, M. N.; Russian Scientific Foundation [14-12-01033]; President of Russian Federation [MK-1700.2013.2]; U.S. Department of Energy [DE-FG02-07ER46382, DE-AC02-98CH10886]
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Kagan, M. Y.
Anomalous superconductivity and superfluidity in repulsive fermion systems / M. Y. Kagan, V. A. Mitskan, M. M. Korovushkin // Phys. Usp. - 2015. - Vol. 58, Is. 8. - P. 733-761, DOI 10.3367/UFNe.0185.201508a.0785. - Cited References: 369. - We are grateful to M A Baranov, A V Chubukov, D V Efremov, M V Feigel'man, V V Kabanov, K I Kugel', M S Marienko, N M Plakida, N V Prokorev, A Ya Tzalenchuk, and V V Val'kov for the fruitful discussions and constant attention to our work. The work was supported by the Russian Foundation for Basic Research (project nos. 14-02-00058 and 14-02-31237). M Yu K thanks the Program of Basic Research of the National Research University Higher School of Economics for support. The work of MM K was supported by grant of the President of the Russian Federation (SP-1361.2015.1) and the Dinasty Foundation . - ISSN 1063-7869

РУБ Physics, Multidisciplinary
Рубрики:
HEXAGONAL BORON-NITRIDE
   SCANNING-TUNNELING-MICROSCOPY
   2-DIMENSIONAL HUBBARD-MODEL
   HIGH-TC SUPERCONDUCTIVITY
   ELECTRON-ENERGY SPECTRUM
   P-WAVE SUPERCONDUCTIVITY
   DOUBLE-LAYER GRAPHENE
   2D KONDO-LATTICE
   GROUND-STATE
   TRANSITION-TEMPERATURE
Кл.слова (ненормированные):
anomalous superconductivity -- Kohn-Luttinger mechanism -- superfluidity -- repulsive Fermi gas -- Hubbard and t-Jmodel -- Shubin Vonsovsky model -- graphene monolayer -- graphene bilayer
Аннотация: We discuss the mechanisms of unconventional superconductivity and superfluidity in 3D and 2D fermionic systems with purely repulsive interaction at low densities. We construct phase diagrams of these systems and find the areas of the superconducting state in free space, as well as on the lattice in the framework of the Fermi-gas model with hard-core repulsion, the Hubbard model, the Shubin-Vonsovsky model, and the t-J model. We demonstrate that the critical superconducting temperature can be greatly increased in the spin-polarized case or in a two-band situation already at low densities. The proposed theory is based on the Kohn-Luttinger mechanism or its generalizations and explains or predicts anomalous p-, d-, and f-wave pairing in various materials, such as high-temperature superconductors, the idealized monolayer and bilayer of doped graphene, heavy-fermion systems, layered organic superconductors, superfluid 3He, spin-polarized 3He mixtures in 4He, ultracold quantum gases in magnetic traps, and optical lattices.

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Публикация на русском языке Каган, Максим Юрьевич. Аномальная сверхпроводимость и сверхтекучесть в фермионных системах с отталкиванием [Текст] / М. Ю. Каган, В. А. Мицкан, М. М. Коровушкин // Успехи физ. наук : ред. журн. "Успехи физ. наук", 2015. - Т. 185 № 8. - С. 785-815

Держатели документа:
Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, Russian Federation
National Research University, Higher School of Economics, ul. Myasnitskaya 20, Moscow, Russian Federation
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, str. 38, Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, prosp. Gazety Krasnoyarskii rabochii 31, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович
}
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Ovchinnikov, S. G.
Effect of interlayer tunneling on the electronic structure of bilayer cuprates and quantum phase transitions in carrier concentration and high magnetic field / S. G. Ovchinnikov, I. A. Makarov, E. I. Shneyder // J. Exp. Theor. Phys. - 2011. - Vol. 112, Is. 2. - P. 288-302, DOI 10.1134/S106377611005119X. - Cited References: 64. - This study was supported financially by the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences (project no. 5.7), the integration projects of the Siberian Branch and the Ural Division of the Russian Academy of Sciences (project no. 40), the Russian Foundation for Basic Research (project no. 09-02-00127), the President of the Russian Federation (grant no. MK-1683.2010.2), and the Federal Target Program P891. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   HIGH-TEMPERATURE SUPERCONDUCTORS
   DIMENSIONAL HUBBARD-MODEL
   FERMI-SURFACE
   COPPER OXIDES
   GROUND-STATE
   CUO2 PLANES
   SPECTRUM
   BAND
   NMR
Кл.слова (ненормированные):
Antibonding -- Bi-layer -- Bilayer cuprates -- Complex sequences -- Cuprates -- Doping levels -- External magnetic field -- Field magnitude -- Hartree-Fock approximations -- High magnetic fields -- Lifshitz transition -- Main effect -- Orbitals -- Perturbation theory -- Quantum phase transitions -- Quantum transitions -- Single-layer structure -- Theoretical study -- Unit cells -- Carrier concentration -- Copper compounds -- Density functional theory -- Electronic properties -- Electronic structure -- Hartree approximation -- Magnetic fields -- Perturbation techniques -- Phase transitions -- Surface structure -- Quantum theory
Аннотация: We present a theoretical study of the electronic structure of bilayer HTSC cuprates and its evolution under doping and in a high magnetic field. Analysis is based on the t-t'-taEuro(3)-J* model in the generalized Hartree-Fock approximation. Possibility of tunneling between CuO2 layers is taken into account in the form of a nonzero integral of hopping between the orbitals of adjacent planes and is included in the scheme of the cluster form of perturbation theory. The main effect of the coupling between two CuO2 layers in a unit cell is the bilayer splitting manifested in the presence of antibonding and bonding bands formed by a combination of identical bands of the layers themselves. A change in the doping level induces reconstruction of the band structure and the Fermi surface, which gives rise to a number of quantum phase transitions. A high external magnetic field leads to a fundamentally different form of electronic structure. Quantum phase transitions in the field are observed not only under doping, but also upon a variation of the field magnitude. Because of tunneling between the layers, quantum transitions are also split; as a result, a more complex sequence of the Lifshitz transitions than in single-layer structures is observed.

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Влияние межслойного туннелирования на электронную структуру двухслойных купратов и квантовые фазовые переходы по концентрации носителей и сильному магнитному полю [Текст] / С. Г. Овчинников, И. А. Макаров, Е. И. Шнейдер // Журнал экспериментальной и теоретической физики. - 2011. - Т. 139 Вып. 2. - С. 334-350

Держатели документа:
[Ovchinnikov, S. G.
Makarov, I. A.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.
Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
}
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Val'kov, V. V.
Magnetic-field-induced phase transition in a two-dimensional quantum magnet with plaquette distortion / V. V. Val'kov, V. A. Mitskan // J. Exp. Theor. Phys. - 2007. - Vol. 105, Is. 1. - P. 90-93, DOI 10.1134/S1063776107070199. - Cited References: 10 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GROUND-STATE
CRYSTALS
Кл.слова (ненормированные):
Antiferromagnetism -- Magnetic field effects -- Magnets -- Phase diagrams -- Problem solving -- Spectrum analysis -- Plaquette distortion -- Quantum Heisenberg magnet -- Quantum transition -- Two-dimensional quantum magnet -- Phase transitions
Аннотация: Magnetic field effect on the structure of the ground state of a two-dimensional quantum Heisenberg magnet is analyzed. A plaquette representation is used to solve the self-consistent problem and calculate the collective excitation spectrum in a magnetic field. Conditions are found for quantum transition between non-magnetic and oblique antiferromagnetic phases. The change in the ground state of the system is associated with disappearance of the gap in the spin excitation spectrum. Effects of frustration and magnetic field on the spectrum are analyzed. A phase diagram of stable singlet and magnetically ordered phases is presented.

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Krasnoyarsk State University, Krasnoyarsk 660075, Russian Federation
Krasnoyarsk State Technical University, Krasnoyarsk 660074, Russian Federation

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Вальков, Валерий Владимирович
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Magnetic structure and magnetic excitations in the two-dimensional spin system of the Cu3B2O6 compound / G. A. Petrakovskii [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 7. - P. 1315-1320, DOI 10.1134/S1063783407070207. - Cited References: 21 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
LONG-RANGE ORDER
   HEISENBERG-MODEL
   GROUND-STATE
   GAP
   ANTIFERROMAGNET
   SRCU2(BO3)(2)
   CUGEO3
   CHAINS
   CAV4O9
Аннотация: This paper reports on the results of measurements of the magnetic susceptibility, heat capacity, neutron scattering, muon spin relaxation, and electron paramagnetic resonance in Cu3B2O6 for the study of the ground state of the spin system of this compound. The results obtained suggest that, at a temperature of 10 K, the spin subsystem of the crystal, which consists of single spins and clusters of pairs and fours of spins interacting with one another, undergoes a transition to a state representing a superposition of the singlet (for clusters) and magnetically ordered (for single spins) states.

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Держатели документа:
LV Kirenskii Inst Phys, Siberian Div, Russian Acad Sci, Krasnoyarsk 660036, Russia
Paul Scherrer Inst, Villigen, Switzerland
Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Paul-Scherrer Institute, Villigen, Switzerland
Institute of Physics, Polish Academy of Sciences, Warsaw 02-668, Poland

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Popov, M. A.; Schefer, J.; Neidermayer, C.; Aleshkevich, P.; Szymczak, R.
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Aplesnin, S. S.
Quantum Monte Carlo investigation of the 2D Heisenberg model with S=1/2 / S. S. Aplesnin // Phys. Solid State. - 1999. - Vol. 41, Is. 1. - P. 103-107, DOI 10.1134/1.1130737. - Cited References: 33 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SQUARE-LATTICE
   GROUND-STATE
   SPIN-CORRELATIONS
   ANTIFERROMAGNET
   LA2CUO4
   EU2CUO4
   ENERGY
   ORDER
Аннотация: The two-dimensional (2D) Heisenberg model with anisotropic exchange (Delta=1-J(x)/J(z)) and S=1/2 is investigated by the quantum Monte Carlo method. The energy, susceptibility, specific heat, spin-spin correlation functions, and correlation radius are calculated. The sublattice magnetization (sigma) and the Neel temperature of the anisotropic antiferromagnet are logarithmic functions of the exchange anisotropy: 1/sigma + 1 + 0.13(1) ln(1/Delta). Crossover of the static magnetic structural factor as a function of temperature from power-law to exponential occurs for T(c)/J approximate to 0.4. The correlation radius can be approximated by 1/xi =2.05T(1.0(6))/exp(1.0(4)/ T). For La(2)CuO(4) the sublattice magnetization is calculated as sigma=0.45, the exchange is J=(1125=1305) K; for Er(2)CuO(4)J similar to 625 K and the exchange anisotropy Delta similar to 0.003. The temperature dependence of the static structural magnetic factor and the correlation radius above the Neel temperature in these compounds can be explained by the formation of topological excitations (spinons). (C) 1999 American Institute of Physics. [S1063-7834(99)02401-6].

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Держатели документа:
Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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Aplesnin, S. S.
Modeling a dimer state in CuGeO3 in the two-dimensional anisotropic Heisenberg model with alternated exchange interaction / S. S. Aplesnin // J. Exp. Theor. Phys. - 1997. - Vol. 85, Is. 6. - P. 1196-1203, DOI 10.1134/1.558393. - Cited References: 33 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
SPIN-PEIERLS TRANSITION
   HIGH MAGNETIC-FIELDS
   COMPOUND CUGEO3
   GROUND-STATE
   SYSTEMS
   NEUTRON
Аннотация: The two-dimensional Heisenberg spin-1/2 model with alternated exchange interaction along the c axis and an anisotropic distribution of the exchange interaction in the lattice, J(b)/J(c)=0.1, is examined. A quantum Monte Carlo method is used to calculate the phase diagrams of the antiferromagnet, the dimer state in a plane, the value of the alternation delta of the exchange interaction, and the anisotropy Delta=1-J(xy)/J(z) of the exchange interaction, Delta similar to delta(0.58(6)). The following characteristics are calculated for Delta=0.25: the dependence of the temperature of the dimer-state-paramagnet transition on the alternation of the exchange interaction, T-c(delta)=0.55(4(delta-0.082(6))(0.50(3)), the singlet-triplet energy gap, and the dependence of the magnetization on the external field for some values of delta. The value of the exchange interaction, J(c)=127 K, the alternation of the exchange interaction, delta=0.11J(c), and the correlation radius along the c axis, xi(c) approximate to 28c, are determined. Finally, it is found that the temperature dependence of the susceptibility and the specific heat are in good agreement with the experimental data. (C) 1997 American Institute of Physics. [S1063-7761(97)01912-4].

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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Phase transition in the one-dimensional quantum discrete phi(4)-phi(2) model / G. P. Berman [et al.] // Phys. Rev. B. - 1997. - Vol. 56, Is. 18. - P. 11518-11530, DOI 10.1103/PhysRevB.56.11518. - Cited References: 16 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
FRENKEL-KONTOROVA MODEL
   FIELD-THEORY
   GROUND-STATE
   FLUCTUATIONS
Аннотация: We consider the ground-state phase transition from broken to restored phases of the one-dimensional quantum discrete phi(4)-phi(2) model as a function of two parameters: the strength of the quantum fluctuations (measured by a dimensionless Planck constant (h) over bar), and the classical dimensionless coupling parameter gamma, which characterizes the strength of interaction of the neighboring atoms. We introduce several distinct variational methods based on self-consistent phonons and soliton wave functions, and compare their predictions for the phase diagram with the (numerically exact) results of previous quantum Monte Carlo simulations. Our calculations show that in the region of weak coupling (gamma 1), both the ''tunneling soliton'' and the ''two-level'' approaches provide good approximations to the true result. In the intermediate coupling region (gamma(c) gamma 1), the method of self-consistent phonons gives a satisfactory description of phase transition. We also compare and contrast our results with previously published approximate methods, and discuss problems for further investigation. [S0163-1829(97)06242-5].

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Держатели документа:
LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801
ИФ СО РАН

Доп.точки доступа:
Berman, G. P.; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Campbell, D. K.; Gubernatis, J. E.; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Wang, X. D.
}
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10.

Val'kov, V. V.
The magnetoelastic mechanism of singlet phase formation in a two-dimensional quantum antiferromagnet / V. V. Val'kov, V. A. Mitskan, G. A. Petrakovskii // J. Exp. Theor. Phys. - 2006. - Vol. 102, Is. 2. - P. 234-247, DOI 10.1134/S106377610602004X. - Cited References: 18 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GROUND-STATE
   SPIN
   TRANSITION
   CUGEO3
   MODEL
Кл.слова (ненормированные):
Crystal lattices -- Elasticity -- Mathematical models -- Oscillations -- Phase diagrams -- Phase transitions -- Quantum theory -- Two dimensional -- Atomic representation -- Magnetoelastic mechanism -- Quantum antiferromagnets -- Singlet phase formation -- Antiferromagnetic materials
Аннотация: A model describing the second-order phase transition with respect to the magnetoelastic coupling parameter from the anti ferromagnetic (AFM) to the singlet state in a two-dimensional quantum magnet on a square lattice is proposed. The spectrum of elementary excitations in the singlet and AFM phases is calculated using an atomic representation, and the evolution of transverse and longitudinal branches of this spectrum is studied in the vicinity of the transition point. It is established that the AFM to singlet phase transition is related to softening of the longitudinal branch of oscillations. In the singlet phase, the gap plays the role of a parameter characterizing the distance to the phase transition point. It is shown that the spectrum of transverse oscillations in the AFM phase corresponds to the Goldstone boson. Based on an analysis of the stability of the spectrum of elementary excitations, a phase diagram is constructed that determines the regions of the existence of phases with plaquette-deformed lattices.

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Держатели документа:
Russian Acad Sci, Siberian Div, Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
ИФ СО РАН
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Technical University, Krasnoyarsk, 660074, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660075, Russian Federation

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Вальков, Валерий Владимирович
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