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1.


    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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2.


    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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3.


    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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4.


    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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GEKHT, R. S.
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5.


   
    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


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Доп.точки доступа:
Gekht, R. S.; Fedoseeva, N. V.; Dolina, V. A.; Balaev, A. D.; Балаев, Александр Дмитриевич
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6.


    Gekht, R. S.
    Low-temperature properties of one-dimensional heisenberg systems with random anisotropy / R. S. Gekht // Phys. Status Solidi B. - 1984. - Vol. 122, Is. 2. - P. 509-517, DOI 10.1002/pssb.2221220215. - Cited References: 16 . - ISSN 0370-1972
РУБ Physics, Condensed Matter


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7.


    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


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Доп.точки доступа:
PONOMAREV, V. I.
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8.


    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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9.


    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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10.


    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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