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APLESNIN, S. S.
INCOMMENSURATE AND APERIODIC STRUCTURES IN FRUSTRATED ANTIFERROMAGNETS WITH HCP LATTICES / S. S. APLESNIN, R. S. GEKHT // Zhurnal Eksperimentalnoi Teor. Fiz. - 1989. - Vol. 96, Is. 6. - P. 2163-2171. - Cited References: 16 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary

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Доп.точки доступа:
GEKHT, R. S.
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GEKHT, R. S.
MAGNETIC TRANSITION FROM INCOMMENSURABLE TO COMMENSURABLE INTERMEDIATE PHASE AND LOW-TEMPERATURE SPIN CORRELATIONS / R. S. GEKHT // Zhurnal Eksperimentalnoi Teor. Fiz. - 1987. - Vol. 93, Is. 1. - P. 255-265. - Cited References: 24 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary

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GEKHT, R. S.
COLLECTIVE MODES OF INCOMMENSURATE STRUCTURES IN SYSTEMS WITH DIPOLE INTERACTION / R. S. GEKHT // Zhurnal Eksperimentalnoi Teor. Fiz. - 1986. - Vol. 91, Is. 1. - P. 190-201. - Cited References: 19 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary

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GEKHT, R. S.
LOW-TEMPERATURE PROPERTIES OF QUASI-2-DIMENSIONAL FRUSTRATED ANTI-FERROMAGNETICS / R. S. GEKHT, V. I. PONOMAREV // Fiz. Tverd. Tela. - 1994. - Vol. 36, Is. 11. - P. 3394-3397. - Cited References: 8 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
MAGNETIC STATES
ANTIFERROMAGNETS

WOS

Доп.точки доступа:
PONOMAREV, V. I.
}
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GEKHT, R. S.
MAGNETIC-STRUCTURES AND PROPERTIES OF STATES IN STRONGLY FRUSTRATED HEISENBERG ANTIFERROMAGNETS / R. S. GEKHT // Zhurnal Eksperimentalnoi Teor. Fiz. - 1992. - Vol. 102, Is. 6. - P. 1968-1982. - Cited References: 23 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
PHASE-TRANSITIONS
   SPIN
   LATTICE
   MODELS
   LONG
Аннотация: The magnetic structures and properties of states in frustrated Heisenberg antiferromagnets are analyzed. It is shown that frustrations induced due to additional spins in the system lead to a large variety of phase with the commensurable and uncommensurable periods and also to arising nonperiodical phases. The energy spectrum of states is studied. It is found that in the large region of the frustration parameter variation the modulated phase (0, Q) is unstable. The phase diagram of states is found and the region of local degeneration for some structures is indicated.

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GEKHT, R. S.
ON MAGNETIC STATES IN STRONGLY FRUSTRATED 2-DIMENSIONAL ANTIFERROMAGNETICS / R. S. GEKHT, V. V. GRISHIN // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 11. - P. 3557-3559. - Cited References: 5 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
LATTICE

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Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK,RUSSIA
ИФ СО РАН

Доп.точки доступа:
GRISHIN, V. V.
}
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Gekht, R. S.
Magnetic states in structures of space-periodic distributed ferromagnetic particles / R. S. Gekht, V. A. Ignatchenko // Fiz. Nizk. Temp. - 1981. - Vol. 7, Is. 9. - P. 1176-1183. - Cited References: 8 . - ISSN 0132-6414

РУБ Physics, Applied

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Доп.точки доступа:
Ignatchenko, V. A.; Игнатченко, Вальтер Алексеевич
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Gekht, R. S.
Phase-transition in small ferromagnetic particle system / R. S. Gekht, V. A. Ignatchenko // Izvestiya Akademii Nauk SSSR Seriya Fizicheskaya. - 1980. - Vol. 44, Is. 7. - P. 1362-1366. - Cited References: 13 . - ISSN 0367-6765

РУБ Physics, Multidisciplinary

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Доп.точки доступа:
Ignatchenko, V. A.; Игнатченко, Вальтер Алексеевич
}
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Игнатченко, Вальтер Алексеевич.
Динамический гистерезис ферромагнетиков. Модель однородного вращения / В. А. Игнатченко, Р. С. Гехт // Программа и тезисы Международной конференции по магнетизму. - М. : Наука, 1973. - Ст. 26a-W2

Держатели документа:
Институт физики им. Л.В. Киренского АН СССР

Доп.точки доступа:
Гехт, Рудольф Сергеевич; Gekht R.S.; Ignatchenko, V. A.; Международная конференция по магнетизму(1973 ; 22-28 авг. ; Москва); International Conference on Magnetism(1973 ; Aug. 22-28 ; Moscow)
Нет сведений об экземплярах (Источник в БД не найден)
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10.

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

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Доп.точки доступа:
Fedoseeva, N. V.; Gekht, R. S.; Velikanova, T. A.; Balaev, A. D.; Балаев, Александр Дмитриевич
}
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11.

GEKHT, R. S.
VORTEX INCOMMENSURATE STRUCTURE IN MAGNETICS WITH DIPOLE INTERACTION / R. S. GEKHT // Fiz. Tverd. Tela. - 1984. - Vol. 26, Is. 2. - P. 567-569. - Cited References: 7 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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12.

GEKHT, R. S.
LOW-TEMPERATURE PROPERTIES OF UNIDIMENSIONAL MAGNETICS WITH DISORDER / R. S. GEKHT // Fiz. Tverd. Tela. - 1983. - Vol. 25, Is. 7. - P. 2216-2218. - Cited References: 6 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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13.

Gekht, R. S.
Helicoidal magnetic structure in frustrated antiferromagnetics / R. S. Gekht, A. M. Epikhin, V. I. Ponomarev // Fiz. Tverd. Tela. - 1995. - Vol. 37, Is. 6. - P. 1891-1893. - Cited References: 6 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
QUANTUM FLUCTUATIONS
PHASE-TRANSITIONS

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Доп.точки доступа:
Epikhin, A. M.; Ponomarev, V. I.
}
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14.

Gekht, R. S.
Magnetic states and spin-wave excitations in strongly frustrated 2d heisenberg antiferromagnets / R. S. Gekht, A. M. Epikhin, V. I. Ponomarev // Phys. Lett. A. - 1995. - Vol. 201, Is. 2-3. - P. 247-251, DOI 10.1016/0375-9601(95)00222-O. - Cited References: 19 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary

Аннотация: It is shown that frustrations caused by additional spins result in a greater variety of phases with commensurate and incommensurate periods as well as in the appearance of nonperiodic phases. It is established that a single-e modulated phase is unstable against zero-point motions. As a result, a disordered state with zero magnetization at a site can exist in a wide range of values of the frustration parameters.

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Доп.точки доступа:
Epikhin, A. M.; Ponomarev, V. I.
}
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15.

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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16.

Gekht, R. S.
A quantum spin liquid in a two-layer triangular antiferromagnet / R. S. Gekht, I. N. Bondarenko // J. Exp. Theor. Phys. - 2005. - Vol. 101, Is. 5. - P. 868-880, DOI 10.1134/1.2149066. - Cited References: 43 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
ONE-DIMENSIONAL ANTIFERROMAGNETS
   DIMER GROUND-STATE
   MEAN-FIELD THEORY
   HEISENBERG-ANTIFERROMAGNET
   SYSTEM SRCU2(BO3)(2)
   PHASE-TRANSITION
   GAP
   FLUCTUATIONS
   EXCITATIONS
   LATTICE
Кл.слова (ненормированные):
Antiferromagnetic materials -- Magnetic fields -- Magnetization -- Phase diagrams -- Spectrum analysis -- Thermodynamics -- Analogous systems -- Square lattices -- Thermodynamic quantities -- Two-layer triangular antiferromagnets -- Quantum theory
Аннотация: The possibility of implementing a quantum-spin-liquid-type state in a two-layer triangular spin-1/2 antiferromagnet at T = 0 is investigated. The ratio of intra- to interlayer exchange constants (j) is found under which a transition from the classical state with 120 degrees triangular order to a quantum state with zero magnetization per site occurs; in this case, the spins of adjacent layers form singlets that are separated from triplet excitations by an energy gap. Compared with an analogous system with the square lattice, the range of j in which the classical ordered state is realized turns out to be an order of magnitude smaller due to the effects of frustration; in this case, the behavior of thermodynamic quantities is analogous, on the whole, to that in two-layer square lattices; a difference manifests itself in the behavior of the gap in the spectrum of quasiparticles in an external magnetic field h. For small fields h, a j-h phase diagram is constructed that determines the domains in which the 120 degrees and the singlet phases exist. It is established that, in the neighborhood of the second-order phase transition, the contribution, to the thermodynamic quantities, of longitudinal spin fluctuations, which are disregarded in the spin-wave description, is comparable to the contribution of transverse fluctuations. (c) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation

Доп.точки доступа:
Bondarenko, I. N.
}
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17.

Gekht, R. S.
Magnetic ordering and phase transitions in planar antiferromagnetic systems with a Kagome lattice / R. S. Gekht, I. N. Bondarenko // J. Exp. Theor. Phys. - 1998. - Vol. 86, Is. 6. - P. 1209-1215, DOI 10.1134/1.558592. - Cited References: 23 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
TRIANGULAR LATTICE
   2 DIMENSIONS
   SPIN
   MODEL
Аннотация: We study the process of magnetic ordering in planar antiferromagnetic systems with a Kagome lattice. It is found that if the interaction between next-nearest-neighbor spins is taken into account, the heat capacity of such systems has a singularity at a finite temperature T. On the basis of a scaling analysis of finite-size systems we study the behavior of thermodynamic quantities in the neighborhood of a phase transition. We find that the phase transition at the critical point is due to discrete- and continuous-symmetry breaking, in which the long-range chiral order and the power-law translational spin order emerge simultaneously. Finally, we calculate the temperatures of the transition to different (with three and nine spins per unit cell) ordered states. (C) 1998 American Institute of Physics.

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

Доп.точки доступа:
Bondarenko, I. N.
}
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18.

Gekht, R. S.
Magnetic states and phase-transitions in frustrated triangular-lattice antiferromagnets / R. S. Gekht // Uspekhi Fiz. Nauk. - 1989. - Vol. 159, Is. 2. - P. 261-296, DOI 10.3367/UFNr.0159.198910b.0261. - Cited References: 137 . - ISSN 0042-1294

РУБ Physics, Multidisciplinary

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19.

GEKHT, R. S.
THERMODYNAMIC PROPERTIES OF A ONE-DIMENSIONAL HEISENBERG-SYSTEM WITH LONG-RANGE INTERACTION / R. S. GEKHT // Theor. Math. Phys. - 1983. - Vol. 54, Is. 3. - P. 283-289, DOI 10.1007/BF01018910. - Cited References: 14 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical

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20.

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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