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Martynov, S. N.
Anharmonic states of the one-dimensional anisotropic Heisenberg model with free boundary conditions / S. N. Martynov // Theor. Math. Phys. - 1998. - Vol. 117, Is. 3. - P. 1499-1506, DOI 10.1007/BF02557187. - Cited References: 6 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
STRING HYPOTHESIS
Аннотация: States described by anharmonic functions are shown to exist in the one-dimensional anisotropic Heisenberg model with a finite number of spins 1/2 and free boundary conditions. Several such, states are determined.

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

Доп.точки доступа:
Мартынов, Сергей Николаевич
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Martynov, S. N.
Antisymmetric Exchange in the CuB2O4 A Subsystem / S. N. Martynov // JETP Letters. - 2009. - Vol. 90, Is. 1. - P. 55-58, DOI 10.1134/S0021364009130116. - Cited References: 31 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
TRANSVERSE MAGNETIC-FIELD
   FLUCTUATION-INDUCED PHASE
   COPPER METABORATE
   ANTIFERROMAGNETIC CHAINS
   SOLITON LATTICE
   INDUCED GAP
   SPIN-WAVES
   BA2CUGE2O7
   CSCUCL3
   MNSI
Аннотация: The space distribution of the components of the microscopic Hamiltonian of the antisymmetric Dzyaloshinskii-Moriya exchange with respect to the exchange bond pairs of the A subsystem of Cu2+ ions in the crystallographic 4b positions of CuB2O4 has been obtained using symmetry analysis. The possibility of the coexistence of two different types of the exchange spatial distribution is demonstrated. The component of the anti-symmetric exchange vector D parallel to the tetragonal axis has a weakly ferromagnetic distribution for all of the directions of the bonds between the nearest magnetic neighbors. Each exchange bond has an additional component of the antisymmetric exchange parallel to the bond projection on the tetragonal plane. The spatial distribution of these components is helicoidal with the modulation vector in the tetragonal crystal plane.

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

Доп.точки доступа:
Мартынов, Сергей Николаевич
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Martynov, S. N.
Continual approach at T=0 in the mean field theory of incommensurate magnetic states in the frustrated Heisenberg ferromagnet with an easy axis anisotropy / S. N. Martynov, V. I. Tugarinov, A. S. Martynov // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 47-49, DOI 10.1016/j.jmmm.2016.12.086. - Cited References:9 . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
FERRIMAGNET
Кл.слова (ненормированные):
Incommensurate magnetic structures -- Soliton lattice -- Continual approach
Аннотация: The algorithm of approximate solution was developed for the differential equation describing the anharmonical change of the spin orientation angle in the model of ferromagnet with the exchange competition between nearest and next nearest magnetic neighbors and the easy axis exchange anisotropy. The equation was obtained from the collinearity constraint on the discrete lattice. In the low anharmonicity approximation the equation is resulted to an autonomous form and is integrated in quadratures. The obvious dependence of the angle velocity and second derivative of angle from angle and initial condition was derived by expanding the first integral of the equation in the Taylor series in vicinity of initial condition. The ground state of the soliton solutions was calculated by a numerical minimization of the energy integral. The evaluation of the used approximation was made for a triple point of the phase diagram.

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Доп.точки доступа:
Tugarinov, V. I.; Тугаринов, Василий Иванович; Martynov, A. S.; Мартынов, Александр Сергеевич; Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
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Martynov, S. N.
Continual approach at T=0 in the mean field theory of incommensurate magnetic states in the frustrated Heisenberg magnet with an easy axis anisotropy / S. N. Martynov, V. I. Tugarinov, A. S. Martynov // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. O1.15. - P. 54. - References: 2 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
incommensurate states -- frustration -- anisotropy

Доп.точки доступа:
Tugarinov, V. I.; Тугаринов, Василий Иванович; Martynov, A. S.; Мартынов, Александр Сергеевич; Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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    Martynov, S. N.
    Continual approach in the mean field theory of incommensurate magnetic states in the Frustrated Heisenberg ferromagnet / S. N. Martynov, V. I. Tugarinov, A. S. Martynov // J. Sib. Fed. Univ. Math. Phys. - 2017. - Vol. 10, Is. 1. - P. 55-59 ; Журн. СФУ. Сер. "Математика и физика", DOI 10.17516/1997-1397-2017-10-1-55-59. - Cited References: 3 . - ISSN 1997-1397
   Перевод заглавия: Континуальное приближение в теории среднего поля несоизмеримых магнитных состояний во фрустрированном гейзенберговском ферромагнетике
Кл.слова (ненормированные):
Incommensurate magnetic structures -- Soliton lattice -- Continual approach -- несоизмеримые магнитные структуры -- солитонная решетка -- континуальное приближение
Аннотация: The algorithm of approximate solution has been developed for the differential equation describing the anharmonical change of the spin orientation angle in the model of ferromagnet with the exchange competition between nearest and next nearest magnetic neighbors and the easy axis exchange anisotropy. The obvious dependence of the angle velocity from angle and initial condition has been derived by expanding the first integral of the equation in the Taylor series in vicinity of initial condition. © Siberian Federal University. All rights reserved.
Разработан алгоритм приближенного решения дифференциального уравнения, описывающего ангармоническое изменение угла ориентации спина в модели легкоосного ферромагнетика с конкуренцией обменов между ближайшими и следующими за ближайшими магнитными соседями. Явная зависимость угловой скорости от угла и начального условия получена путем разложения первого интеграла уравнения в ряд Тейлора в окрестности начального условия

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Держатели документа:
Kirensky Institute of Physics, SB RAS, Akademgorodok, 50/38, Krasnoyarsk, Russian Federation
Faculty of Physics, Moscow State University, Moscow, Russian Federation

Доп.точки доступа:
Tugarinov, V. I.; Тугаринов, Василий Иванович; Martynov, A. S.; Мартынов, Александр Сергеевич; Мартынов, Сергей Николаевич

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MARTYNOV, S. N.
CORRELATION-FUNCTIONS AND ELECTRON-SPIN-RESONANCE LINEWIDTH OF TWO-DIMENSIONAL HEISENBERG MAGNETS / S. N. MARTYNOV // Fiz. Tverd. Tela. - 1986. - Vol. 28, Is. 10. - P. 3006-3011. - Cited References: 15 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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MARTYNOV, S. N.
ELECTRON-SPIN-RESONANCE LINEWIDTH AND LINESHAPE OF DIAMAGNETICALLY DOPED ONE-DIMENSIONAL HEISENBERG MAGNET / S. N. MARTYNOV // Fiz. Tverd. Tela. - 1987. - Vol. 29, Is. 1. - P. 292-294. - Cited References: 6 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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Martynov, S. N.
Exact two-magnon solutions of the one-dimensional isotropic Heisenberg model and string hypothesis / S. N. Martynov // Phys. Lett. A. - 1996. - Vol. 219, Is. 5-6. - P. 329-334, DOI 10.1016/0375-9601(96)00470-7. - Cited References: 5 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary

Кл.слова (ненормированные):
Heisenberg model -- two-magnon states -- Bethe ansatz -- resonance absorption
Аннотация: By means of the exact solution of the Schrodinger equation the eigenfunctions and eigenvalues of the energy for two-magnon states in the one-dimensional isotropic Heisenberg spin chain of N spins-1/2 were found. It is shown that symmetrical and antisymmetrical complex solutions have different K-dependences of the energy. Exact values of the quasi-momentum for both branches are compared with a string hypothesis prediction and solutions of the Bethe ansatz equations. With the help of the obtained solutions it was shown that resonance absorption leads to a change in momentum of the existing magnon and excitation of the magnon whose momentum is different from the absorption momentum.

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Мартынов, Сергей Николаевич
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Martynov, S. N.
Field-induced helical magnetic structure in the two-subsystem frustrated antiferromagnet / Martynov S.N. // Moscow Int. Symp. on Magnet. (MISM-2008) : June 20-25, 2008, Moscow : book of abstract. - 2008. - Ст. 23PO-12-17. - p. 521. - Библиогр.: 2

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Доп.точки доступа:
Мартынов, Сергей Николаевич; Moscow International Symposium on Magnetism(4 ; 2008 ; Jun. ; Moscow)Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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10.

Martynov, S. N.
Flat and conical incommensurate magnetic structures in the two-subsystem partially frustrated Heisenberg ferrimagnet / S. N. Martynov // J. Magn. Magn. Mater. - 2016. - Vol. 398. - P. 121-126, DOI 10.1016/j.jmmm.2015.09.046. - Cited References: 21 . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
Spin-wave spectrum
   Phase 10 K
   Copper metaborate
   Classical-theory
   State
Кл.слова (ненормированные):
Incommensurate magnetic structures -- Phase transitions -- Ferrimagnets
Аннотация: The phase transitions into flat and conical incommensurate magnetic structures are considered for a ferrimagnet with the dominant nonfrustrated exchange between the spins in one crystallographic position, competing exchanges between the spins in another position and frustrated exchange between the spins in different positions. The appearance conditions and the temperatures of the second order phase transitions are analytically obtained in the mean field approximation. The first order phase transition between these states is studied and the phase diagrams of temperature vs frustrated exchanges are calculated by the numerical minimization of free energy.

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Мартынов, Сергей Николаевич
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11.

Martynov, S. N.
Frustration mechanism of formation of a helical magnetic structure in the CuB2O4 two-subsystem antiferromagnet / S. N. Martynov, A. D. Balaev // JETP Letters. - 2007. - Vol. 85, Is. 12. - P. 649-654, DOI 10.1134/S0021364007120132. - Cited References: 21 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
PHASE 10 K
COPPER METABORATE
LATTICE
Аннотация: A new mechanism is proposed for forming an incommensurate magnetic structure of the transverse helix type owing to the removal of frustration through intersubsystem exchange in a two-subsystem antiferromagnet. The symmetry analysis of the distribution of the Dzyaloshinskii-Moriya interaction and comparison with the experimental data on the field dependence of magnetization indicate that antisymmetric exchange and competition between symmetric exchanges cannot be responsible for forming a helical magnetic structure in CuB2O4.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Balaev, A. D.; Балаев, Александр Дмитриевич; Мартынов, Сергей Николаевич
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12.

Martynov, S. N.
Ground State of a Two-Sublattice Anisotropic Ferromagnet in a Magnetic Field / S. N. Martynov // Phys. Solid State. - 2021. - Vol. 63, Is. 8. - P. 1253-1261, DOI 10.1134/S1063783421080199. - Cited References: 38. - This study was supported by the Russian Foundation for Basic Research and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 20-42-240006 "Synthesis and Study of Pb2+-and Bi3+Containing Oxide Single Crystals with Partial Substitution in One of the Subsystems: Magnetic Structures and Magnetodielectric Effect" . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
ANTIFERROMAGNETIC-RESONANCE
SUPEREXCHANGE INTERACTION
WEAK FERROMAGNETISM
Кл.слова (ненормированные):
ferromagnetism -- single-ion anisotropy -- antisymmetric exchange -- orientational phase transition
Аннотация: The ground state of a classical two-sublattice ferromagnet with the noncollinear single-ion anisotropy axes of the sublattices and the antisymmetric and anisotropic symmetric exchanges between them has been investigated in a magnetic field applied along the hard magnetization directions in the crystal. The threshold relations for the parameters of the anisotropic interactions have been obtained, which determine the choice of the ground state among the three possible magnetic phases. Depending on the ground state type and the field direction, the transition between the phases is a first- or second-order phase transition. The antisymmetric exchange value above which the reorientation between the noncollinear phases ends with a second-order transition depends on the angle between the local easy axes and the single-ion anisotropy value. Field dependences of the magnetization and susceptibility for different ground states have been calculated. A comparison with the results of the magnetic measurements in the highly anisotropic PbMnBO4 ferromagnet has been made.

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Публикация на русском языке Мартынов, Сергей Николаевич. Основное состояние двухподрешеточного анизотропного ферромагнетика в магнитном поле [Текст] / С. Н. Мартынов // Физ. тверд. тела. - 2021. - Т. 63 Вып. 8. - С. 1090-1097

Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Мартынов, Сергей Николаевич; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Krasnoyarsk Territorial Foundation [20-42-240006]
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13.

Martynov, S. N.
Ground state of an antiferromagnet with uniform antisymmetric exchange in a magnetic field / S. N. Martynov, V. I. Tugarinov // JETP Letters. - 2010. - Vol. 92, Is. 2. - P. 115-119, DOI 10.1134/S0021364010140092. - Cited References: 12 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
INCOMMENSURATE
TRANSITION
ORDER
Аннотация: A system of two nonlinear differential equations for sublattice angles is proposed to describe the spin orientation distribution in a planar antiferromagnet with uniform antisymmetric exchange in a magnetic field. This system involves the initial symmetry of the problem and is reduced to a single delay differential equation. The solutions of this system are parameterized by the initial condition imposed on the angle of one sublattice at the hyperbolic singular point of the phase space. The numerical analysis of the stability boundary of soliton solutions demonstrates that the transition to the commensurate phase takes place outside the region where the stochastic solutions appear and is accompanied by the magnetization jump Delta m similar to 10(-1) m.

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Держатели документа:
[Martynov, S. N.
Tugarinov, V. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Tugarinov, V. I.; Тугаринов, Василий Иванович; Мартынов, Сергей Николаевич
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14.

    Martynov, S. N.
    Ground state of orthorombic weak antiferromagnet PbMnBO4 with frustrated single-ion anisotropy / S. N. Martynov // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 1. - Ст. G.P10. - P. 578-579. - Cited References: 2. - The study was funded by RFBR and the Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project no. 18-42-240008 . - ISBN 978-5-9500855-7-4
   Перевод заглавия: Основное состояние орторомбического слабого антиферромагнетика PbMnBO4 с фрустрированной одноионной анизотропией

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Мартынов, Сергей Николаевич; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
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15.

Ground state of the classical frustrated heisenberg ferromagnet in a magnetic field / S. N. Martynov // Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 4PO-K-37. - P. 939

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Материалы конференции,
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Доп.точки доступа:
Martynov, S. N.; Мартынов, Сергей Николаевич; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. ЛомоносоваРоссийский фонд фундаментальных исследований
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16.

Martynov, S. N.
Ground state of the orbitally ordered PbMnBO4 ferromagnet / S. N. Martynov // JETP Letters. - 2022. - Vol. 115, Is. 11. - P. 679-684, DOI 10.1134/S0021364022600860. - Cited References: 40 . - ISSN 0021-3640
Аннотация: The ground state of the four-sublattice PbMnBO4 ferromagnet is investigated taking into account the symmetry of the crystal and the spatial distribution of the orbital states of the Mn3+ ions. By numerical minimization of the energy of the ground state of the classical model with three types of anisotropy—single-ion, dipole–dipole, and Dzyaloshinskii–Moriya interaction—the anisotropic interaction parameters for magnetic phases with different orientations of the total magnetization in the crystal are obtained. It is demonstrated that the experimentally observed state with the magnetization directed along the a orthorhombic axis becomes the ground state only in the presence of antisymmetric anisotropic exchange.

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Публикация на русском языке Мартынов, Сергей Николаевич. Основное состояние орбитально упорядоченного ферромагнетика PbMnBO4 [Текст] / С. Н. Мартынов // Письма в ЖЭТФ. - 2022. - Т. 115 Вып. 11. - С. 724-729

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

Доп.точки доступа:
Мартынов, Сергей Николаевич
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17.

Incommensurate magnetic structure of planar antiferromagnet with uniform antisymmetric exchange in magnetic field [Text] / S. N. Martynov, V. I. Tugarinov // IV Euro-Asian Symposium "Trends in MAGnetism" Nanospintronics (EASTMAG-2010). School for young scientist "Spintronics" : June 28 - Lule 2, 2010"Book of abstracts. - Ekaterinburg, 2010. - P. 160

РИНЦ

Доп.точки доступа:
Martynov, S.N.; Tugarinov, V.I.; Euro-Asian Symposium "Trends in MAGnetism"(4 ; 2010 ; Jun.-Jul. ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(4 ; 2010 ; Jun.-Jul. ; Ekaterinburg)Уральское отделение РАН
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18.

Martynov, S. N.
Incommensurate magnetic structures in rhombohedral Heisenberg antiferromagnet / S. N. Martynov // JETP Letters. - 2013. - Vol. 98, Is. 1. - P. 19-23, DOI 10.1134/S0021364013140099. - Cited References: 31 . - 5. - ISSN 0021-3640
Рубрики:
DISORDER
Аннотация: The phase diagram of the ground state has been calculated for a rhombohedral antiferromagnet of the R3m symmetry with frustrated exchange in the base plane and competition of exchanges between the nearest and next-nearest planes. The diagram contains phases of collinear antiferromagnetic ordering of various types separated by five incommensurate magnetic states of the helicoidal type, differing in the ordering type and in the direction of the modulation vector. The commensurate and incommensurate phases converge at multi-critical points lying on a line corresponding to an antiferromagnet with an undistorted simple cubic lattice.

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Публикация на русском языке Несоизмеримые магнитные структуры ромбоэдрического гейзенберговского антиферромагнетика. - [S. l. : s. n.]

Доп.точки доступа:
Мартынов, Сергей Николаевич
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19.

Martynov, S. N.
Incommensurate magnetic structures in the rhombohedrally distorted cubic lattice / S. N. Martynov // Solid State Phenom. : Selected, peer reviewed papers. - 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P. 61-65, DOI 10.4028/www.scientific.net/SSP.215.61. - Cited References: 8 . - ISSN 978-30383. - ISSN 1662-9779
Кл.слова (ненормированные):
Frustration of exchange interactions -- Incommensurate magnetic structures
Аннотация: The ground state of a rhombohedrally distorted magnetic cubic lattice with frustrated exchange in the thriangular base plane of spins and competition of exchanges between the nearest and next nearest planes was investigated. The dependence of helix vector components on the exchange parameters was calculated. The phase diagram of ground state was obtained. © (2014) Trans Tech Publications, Switzerland.

Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Samardak, A. \ed.\; Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; sept. ; 15-21 ; Vladivostok)
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20.

Martynov, S. N.
Incommensurate magnetic structures in the rhombohedrally distorted cubiclattice / S. N. Martynov // V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism : abstracts. - Vladivostok : FEFU, 2013. - P162 . - ISBN 978-5-7444-3124-2

Доп.точки доступа:
Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)
}
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