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FEDOSEEVA, N. V.
MAGNETIC-PROPERTIES OF INCOMMENSURATE ANTIFERROMAGNET BETA-KMNCL3 / N. V. FEDOSEEVA, T. A. VELIKANOVA, A. D. BALAEV // Solid State Commun. - 1984. - Vol. 52, Is. 3. - P. 241-243, DOI 10.1016/0038-1098(84)90816-0. - Cited References: 7 . - ISSN 0038-1098

РУБ Physics, Condensed Matter

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Доп.точки доступа:
VELIKANOVA, T. A.; BALAEV, A. D.; Балаев, Александр Дмитриевич
}
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Petrakovskii, G. A.
Spin-wave spectrum and thermodynamic properties of antiferromagnet with diamagnetic dilution and fluctuating exchange interactions / G. A. Petrakovskii, E. V. Kuzmin, S. S. Aplesnin // Fiz. Tverd. Tela. - 1984. - Vol. 26, Is. 3. - P. 765-772. - Cited References: 17 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

WOS
Доп.точки доступа:
Kuzmin, E. V.; Кузьмин, Евгений Всеволодович; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Петраковский, Герман Антонович
}
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New intermediate phase in the spiral antiferromagnet cscucl3 induced by a strong magnetic-field / N. V. Fedoseeva, R. S. Gekht, T. A. Velikanova, A. D. Balaev // JETP Letters. - 1985. - Vol. 41, Is. 8. - P. 406-410. - Cited References: 5 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary

WOS
Доп.точки доступа:
Fedoseeva, N. V.; Gekht, R. S.; Velikanova, T. A.; Balaev, A. D.; Балаев, Александр Дмитриевич
}
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APLESNIN, S. S.
MAGNETIC-PROPERTIES OF A UNIAXIAL ANISOTROPIC ANTIFERROMAGNET WITH TRIANGULAR LATTICE / S. S. APLESNIN // Fiz. Tverd. Tela. - 1989. - Vol. 31, Is. 10. - P. 83-91. - Cited References: 12 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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Incommensurate magnetic-structures in triangular antiferromagnet CSCuCl3 / R. S. Gekht [et al.] // Phys. Status Solidi B. - 1989. - Vol. 155, Is. 2. - P. 639-646, DOI 10.1002/pssb.2221550234. - Cited References: 16 . - ISSN 0370-1972

РУБ Physics, Condensed Matter

WOS
Доп.точки доступа:
Gekht, R. S.; Fedoseeva, N. V.; Dolina, V. A.; Balaev, A. D.; Балаев, Александр Дмитриевич
}
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Aplesnin, S. S.
New magnetic structural types in a stochastic easy-plane hexagonal-lattice antiferromagnet / S. S. Aplesnin // Zhurnal Eksperimentalnoi Teor. Fiz. - 1991. - Vol. 100, Is. 6. - P. 2068-2073. - Cited References: 8 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary

Аннотация: By means of the numerical simulation new magnetic states, such as a domain structure antiferromagnet having the periodic and nonperiodic solutions in the spin transverse components and two spin-glass states in the chiral and spin order parameters, are found in a stochastic antiferromagnet with the competing couplings and easy-plane anisotropy. Two temperature transitions caused by the chiral and spin symmetry breaking and the magnetic field regions with the induced long-range chiral order are calculated.

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Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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MAGNETIC-BEHAVIOR OF QUASIONE-DIMENSIONAL CSMNBR3 WITH TRIANGULAR SPIN-LATTICE / G. A. PETRAKOVSKII [и др.] // Fiz. Tverd. Tela. - 1993. - Vol. 35, Is. 4. - P. 965-973. - Cited References: 13 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
ANTIFERROMAGNET

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Доп.точки доступа:
PETRAKOVSKII, G. A.; APLESNIN, S. S.; PETROV, S. V.; FEDOSEEVA, N. V.
}
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PANKRATS, A. I.
MICROWAVE RESONANCE-ABSORPTION IN ANTIFERROMAGNET BI2CUO4 / A. I. PANKRATS, G. A. PETRAKOVSKII, K. A. SABLINA // Solid State Commun. - 1994. - Vol. 91, Is. 2. - P. 121-124, DOI 10.1016/0038-1098(94)90267-4. - Cited References: 13 . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
SINGLE-CRYSTAL
NEUTRON-SCATTERING
RANGE
Аннотация: The resonance absorption in Bi2CuO4 single crystals was found in the frequency range 35-80 GHz for H(perpendicular-to)C4 Case and it was absent for H(parallel-to)C4 case. The frequency-field dependence for H(perpendicular-to)C4 case at 4.2 K is typical for easy-plane antiferromagnets with weak magnetic anisotropy in this plane. In contrast to the sublattice magnetization of Bi2CuO4 the resonance parameters depend strongly on the temperature below 20 K. Besides, the resonance field has a considerable jump at TN which ls not typical for second order phase transitions.

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Держатели документа:
L.V. Kirenskii Institute of Physics, SB RAS, 660036 Krasnoyarsk, Russian Federation
ИФ СО РАН

Доп.точки доступа:
PETRAKOVSKII, G. A.; Петраковский, Герман Антонович; SABLINA, K. A.; Саблина, Клара Александровна; Панкрац, Анатолий Иванович
}
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Aplesnin, S. S.
Dimerization of antiferromagnetic chain with 4-spin interaction / S. S. Aplesnin // Fiz. Tverd. Tela. - 1996. - Vol. 38, Is. 6. - P. 1868-1877. - Cited References: 30 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
SPIN-1/2 HEISENBERG-ANTIFERROMAGNET
   COMPETING INTERACTIONS
   MONTE-CARLO
   THERMODYNAMIC PROPERTIES
   SYSTEMS
   CUGEO3
   TEMPERATURE
   NEUTRON
   STATE
   MODEL

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10.

Bondarenko, I. N.
Magnetic transitions in layered triangular antiferromagnets / I. N. Bondarenko, R. S. Gekht, V. I. Ponomarev // Phys. Lett. A. - 1996. - Vol. 222, Is. 4. - P. 269-274, DOI 10.1016/0375-9601(96)00635-4. - Cited References: 22 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
HEISENBERG-ANTIFERROMAGNET
   PHASE-TRANSITION
   VBR2
   SYSTEMS
   FIELD
   VCL2
Кл.слова (ненормированные):
triangular antiferromagnets -- quantum and thermal fluctuations -- successive phase transitions -- Quantum and thermal fluctuations -- Successive phase transitions -- Triangular antiferromagnets
Аннотация: Magnetic states and phase transitions of the layered triangular antiferromagnets in an applied field are studied. It is shown that in compounds like VBr2 and VCl2 quantum effects change the ground state structure and cause successive phase transitions as the magnetic field increases. Coplanar structures of different spin configuration are realized far from the saturation field and a noncoplanar structure of umbrella-type configuration is realized near this field. The ground-state phase diagram is constructed, and a finite region of fields where the collinear phase is also possible is indicated.

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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Gekht, R. S.; Ponomarev, V. I.
}
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11.

Aplesnin, S. S.
Influence of quantum fluctuations on the Neel temperature of a dilute two-dimensional anisotropic antiferromagnet / S. S. Aplesnin // Phys. Solid State. - 1997. - Vol. 39, Is. 5. - P. 800-802, DOI 10.1134/1.1130121. - Cited References: 15 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
LATTICE
Аннотация: A quantum Monte Carlo procedure is used to calculate the energy, sublattice magnetization, Neel temperature, and the slopes of the S=[l/T-N(x=0)]dT(N)(x)/dx curves as functions of the hole concentration and the exchange anisotropy Delta=1-J(x,y)/J(z) in the Heisenberg model with anisotropic negative interactions between nearest neighbors in a square lattice with dilution among the lattice sites. The slope diverges in the limit Delta--0:S similar to ln(6.5/Delta). (C) 1997 American Institute of Physics.

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Держатели документа:
L. V. Kirenskii Inst. of Phys., Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
ИФ СО РАН

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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12.

Aplesnin, S. S.
Quantum spin liquid in an antiferromagnet with four-spin interactions / S. S. Aplesnin // Phys. Solid State. - 1997. - Vol. 39, Is. 8. - P. 1246-1250, DOI 10.1134/1.1130054. - Cited References: 14 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MONTE-CARLO
LA2CUO4
STATE
Аннотация: A quantum Monte Carlo study of the anisotropic antiferromagnet with four-spin interaction (K) and with spin S= 1/2 on a square lattice is reported. Temperature dependences of the capacity, susceptibility, spin correlation functions, and correlation length, and field dependences of magnetization are calculated. Phase diagrams of the ground-state antiferromagnet and gap (K0) and gapless (K0) quantum spin liquids are determined in the exchange-anisotropy-four-spin-coupling-constant (K), magnetic-field (H)-temperature (T), and temperature- (T)-K planes for an exchange anisotropy of 0.1 J. (C) 1997 American Institute of Physics.

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Держатели документа:
Kirenskii Inst. of Physics, Siberian Br. Russ. Acad. of Sci., 660036 Krasnoyarsk, Russian Federation
ИФ СО РАН

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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13.

Aplesnin, S. S.
Quantum spin liquid in the frustrated anisotropic Heisenberg antiferromagnet on a square lattice / S. S. Aplesnin // Phys. Low-Dimens. Struct. - 1997. - Vol. 10. - P. 95-102. - Cited References: 13 . - ISSN 0204-3467

РУБ Physics, Applied + Physics, Condensed Matter

Аннотация: Finite-temperature properties of the frustrated S = 1/2 Heisenberg model with the next-nearest-neighbor exchange (J(2) 0) and anisotropic exchange (Delta

WOS

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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14.

Ovchinnikov, S. G.
Quasiparticles in strongly correlated electronic systems in cuprate oxides / S. G. Ovchinnikov // Uspekhi Fiz. Nauk. - 1997. - Vol. 167, Is. 10. - P. 1043-1068. - Cited References: 227 . - ISSN 0042-1294

РУБ Physics, Multidisciplinary
Рубрики:
T-J-MODEL
   HIGH-TEMPERATURE SUPERCONDUCTORS
   DIMENSIONAL HUBBARD-MODEL
   QUASI-PARTICLE DISPERSION
   HEISENBERG-ANTIFERROMAGNET SR2CUO2CL2
   ANGLE-RESOLVED PHOTOEMISSION
   CHARGE FLUCTUATION REGIME
   SADDLE-POINT SINGULARITY
   SINGLET-TRIPLET MODEL
   LA-SR-CU
Аннотация: New experimental and theoretical results on the electronic structure and spectral properties of quasiparticles in cuprate oxides are reviewed. It is shown that the electronic structure transforms from antiferromagnetic insulators to optimally doped high-temperature superconductors as the doping level is varied. The experimental methods considered are primarily angular resolved photoelectron spectroscopy (ARPES), neutron scattering, and NMR. Two types of electronic structure calculations for data interpretation purposes are considered, namely, exact numerical methods for finite clusters (exact diagonalisation and the quantum Monte Carlo method) and approximate schemes for the infinite lattice. As a result, a coherent unified picture emerges, in which the magnetic polaron of a weakly doped antiferromagnetic lattice transforms into a system of Fermi particles dressed by short-range antiferromagnetic type spin fluctuations. In the region of weakly doped metal compositions, deviations from Fermi-liquid properties are seen, such as the failure of Luttinger's theorem, shadowy photoemission bands, and the spin pseudogap effect in spectral and thermodynamic measurements. The situation in the neighbourhood of the insulator-metal concentration transition is described as least understood.

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Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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15.

Aplesnin, S. S.
A study of anisotropic Heisenberg antiferromagnet with S=1/2 on a square lattice by Monte-Carlo method / S. S. Aplesnin // Phys. Status Solidi B. - 1998. - Vol. 207, Is. 2. - P. 491-498, DOI 10.1002/(SICI)1521-3951(199806)207:2491::AID-PSSB4913.0.CO;2-G. - Cited References: 24 . - ISSN 0370-1972

РУБ Physics, Condensed Matter
Рубрики:
EU2CUO4
   LA2CUO4
   ORDER
   MODEL
   STATE
Аннотация: The two-dimensional (2D) Heisenberg model (J 0) with anisotropic exchange Delta = 1-J(X)/J(Z) greater than or equal to 0 and with S = 1/2 is studied by the quantum Monte-Carlo method. Energy, susceptibility, specific heat, spin-spin correlation functions, and correlation radius are calculated. The dependence of the Neel temperature T(N)/J = 2/ln(11/Delta) on the exchange anisotropy is determined. The static magnetic factor is very slowly decreased for T/J 0.4. It is assumed to realize topological excitations in the range of these temperatures. The correlation radius of the isotropic Heisenberg model is fitted by the dependence 1/xi = 2.05T(1.0(6))/exp (1.0(4)/T).The temperature behavior of the static structural magnetic factor in La(2)CuO(4) and Er(2)CuO(4) for T T(N) is in agreement with the MC calculations.

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

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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16.

Aplesnin, S. S.
Quantum Monte Carlo analysis of the 2D Heisenberg antiferromagnet with S=1/2: the influence of exchange anisotropy / S. S. Aplesnin // J. Phys.: Condens. Matter. - 1998. - Vol. 10, Is. 44. - P. 10061-10065, DOI 10.1088/0953-8984/10/44/012. - Cited References: 21 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
SQUARE LATTICE
SYSTEMS
MODEL
Аннотация: The two-dimensional (2D) Heisenberg model with exchange anisotropy Delta = 1 - J(x)/J(z) (J 0) and S

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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17.

Val'kov, V. V.
Magnetopolaron states of a spin-correlated antiferromagnet in the neighborhood of the spin-glass transition / V. V. Val'kov, D. M. Dzebisashvili // Phys. Solid State. - 1998. - Vol. 40, Is. 2. - P. 282-286, DOI 10.1134/1.1130293. - Cited References: 20 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
OSCILLATIONS
CEAS
Аннотация: The problem of the spectrum of magnetopolaron states of a strongly correlated conducting canted antiferromagnet is solved. The approach used to study the spectrum is based on an atomic representation and a diagram technique for Hubbard operators. This approach makes it possible to include strong intra-ion interactions in a first-principles way, and to obtain the dispersion equation for the magnetopolaron spectrum for arbitrary values of the magnitude of the spin, temperature, and magnetic field. In the vicinity of the spin-flip transition an analytic expression is obtained for the spectrum of magnetopolaron states that goes beyond the framework of the quasiclassical approximation. (C) 1998 American Institute of Physics.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660000, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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18.

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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19.

Magnetic anisotropy of antiferromagnet (CH3)(4)NMnCl3 / A. M. Vorotynov [et al.] // Phys. Solid State. - 2000. - Vol. 42, Is. 7. - P. 1313-1316, DOI 10.1134/1.1131384. - Cited References: 14 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
EXCITATIONS
Аннотация: The parameters of the electron paramagnetic resonance (EPR) spectra of S ion pairs in diamagnetic crystals are analyzed. A relation between the spin Hamiltonian constants is established for solitary ions and pairs for (CH3)(4)NCdCl3:Mn2+ crystals. In contrast to solitary ions, an additional contribution (which is a linear function of the exchange field) to the "single-ion" spin Hamiltonian constants appears in the case of pairs. It is shown that anisotropic exchange mechanisms do not play a significant part in the formation of the axial constant of the spin Hamiltonian for this crystal. Some aspects of the method of studying "single-ion" anisotropy predicted by the two-ion model are developed with the help of an isostructural diamagnetic analog with impurity concentration of the paramagnetic ions of a magnetically concentrated substance sufficiently high for observing the EPR spectrum of the pairs. It is found that the microscopic quantities determined partially from the EPR spectra for pairs and solitary Mn2+ ions in (CH3)(4)NCdCl3 are in accord with the experimental value of the effective field for the (CH3)(4)NMnCl3 crystal anisotropy which can be described primarily by the dipole and "single-ion" mechanisms of the exchange origin. (C) 2000 MAIK "Nauka/Interperiodica".

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

Доп.точки доступа:
Vorotynov, A. M.; Воротынов, Александр Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Sudakov, A. N.
}
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20.

Aplesnin, S. S.
The study of magnetic properties of the quasi-one-dimensianal spin-1/2 antiferromagnet by Monte-Carlo method / S. S. Aplesnin // Phys. Low-Dimens. Struct. - 2000. - Vol. 07.08.2013. - P. 37-46. - Cited References: 15 . - ISSN 0204-3467

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
ONE-DIMENSIONAL ANTIFERROMAGNETS
   SYSTEMS
   CHAINS
   CA2CUO3
Аннотация: The thermodynamic quantities, two- and four-spin correlation functions as well as the correlation radius for weakly coupled antiferromagnetic spin chains with S = 1/2 are calculated using the mean-field approximation for the interchain coupling (J(2)) for longitudinal and transverse spin components by quantum Monte Carlo method. Results for the staggered magnetization and Neel temperature are in agreement with general scaling arguments. The value of triplet DeltaS(z) =1 gp in the spectrum of excitations is estimated. The transverse staggered field was found to induce an additional maximum in the correlation radius of the four spin correlation function around T/J(1) approximate to [0.05 divided by 0.075), J(2)/J(1) 0.03.

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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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