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Влияние пространственного заряда на обменное взаимодействие сгустков электронов и позитронов
С. 23–25.
Kanavets V. I., Mozgovoi Y. D., Khritkin S. A.
In book
Ч. 6: Микроволновая электроника и электродинамика. , М.: Физический факультет МГУ, 2012.
Bogoslovskiy N. A., Петров П. В., Аверкиев Н. С., Physical Review B: Condensed Matter and Materials Physics 2024 No. 024436
We study the theoretical model of a ferromagnetic semiconductor as a system of randomly distributed
Ising spins with a long-range exchange interaction. Using the density-of-states approach, we
analytically obtain the magnetic susceptibility and heat capacity over a wide range of temperatures
and magnetic fields. It is shown that the finite system of spins in magnetic field less than ...
Added: July 9, 2025
Kovaleva N. N., Kusmartseva O. E., Kugel K., Journal of Physics: Conference Series 2024 Vol. 2769 Article 012013
Transition metal oxides incorporating Jahn-Teller (JT) ions Mn3+ (3d4) in manganites and Cu2+ (3d9) in cuprates exhibit outstanding magnetic and electronic properties, including colossal magnetoresistance (CMR) and high-temperature superconductivity (HTSC). The physics of these compounds is associated with the orbitally-degenerate electronic states of JT ions, leading to the linear electron-lattice interaction, complemented by the entirely electronic
superexchange (SE) interaction. Here, ...
Added: December 29, 2024
Igoshev P., Streltsov S., Kliment I. Kugel, Journal of Magnetism and Magnetic Materials 2023 Vol. 587 Article 171315
We present a detailed derivation of the effective Hamiltonian for a strongly correlated electron system involving
both orbital and spin degrees of freedom. This problem is relevant to a wide class of materials containing ions
with the orbitally degenerate ground state (Jahn–Teller ions). We treat in detail the case of double degenerate
orbitals, obtain the Kugel–Khomskii model, and ...
Added: February 1, 2024
Boldyrev K. N., Kuz'min N. N., Mukhin A. A. et al., PHYSICAL REVIEW MATERIALS 2021 Vol. 5 No. 10 Article 104413
We measured the heat capacity, magnetic susceptibility, magnetization, magnetoelectric effect, and optical spectra of samarium chromium borate crystals. It was found that, in SmCr3(BO3)4 single crystals, structures with the space groups R32 and C2/c may coexist. Magnetic phase transitions were discovered at temperatures TN1=7.8±0.5K, TN2=6.7±0.5K, and T3=4.3±0.2K, and assumptions about their nature were made. Based on the high-resolution optical spectra and magnetometry data, the ...
Added: October 31, 2021
A.B. Van'kov, Kukushkin I., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 102 No. 23 P. 235424-1–235424-6
Anomalous behavior of spin stiffness is revealed in ZnO-based two-dimensional electron systems (2DESs)
with strong Coulomb interaction and Wigner-Seitz parameter r_s > 6. The spin stiffness is extracted directly from
the quadratic k-dispersion of spin excitons at ν = 1 probed by inelastic light scattering. The resulting values are
found to be dramatically rescaled compared to the case ...
Added: January 22, 2021
Vankov A., Kaysin B. D., Volosheniuk S. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 4 P. 041407-1–041407-5
An unusual behavior of the exchange energy scale of a quantum Hall ferromagnet with ν=1 was found in strongly correlated two-dimensional electron systems based on MgZnO/ZnO heterostructures. The exchange contribution, entering the energy of a collective excitation, was probed by means of inelastic light scattering. It was established that, in a wide range of electron densities corresponding ...
Added: October 31, 2019
Chetverikov V., Journal of Physics: Conference Series 2019 Vol. 1163 No. 012077 P. 1–6
A theoretical model describing the spontaneous magnetization of a ferromagnetic semiconductor (InMn)As film in the presence of an external electric field directed across the film is considered. It is assumed that the ions of a manganese impurity with spin 5/2 are acceptors, have a uniform spatial distribution inside the semiconductor, and do not change their ...
Added: April 2, 2019
Chetverikov V., Moscow University Physics Bulletin 2018 Vol. 73 No. 6 P. 592–598
A model for the description of the distribution of magnetization across the thickness of a ferromagnetic
semiconductor film is considered. Applying a constant electric field perpendicular to the film surface
makes it possible to change the Curie temperature. The obtained formulas determine the dependence
that this distribution has on the values of the physical parameters of the film. ...
Added: March 1, 2019
Chetverikov V., Вестник Московского университета. Серия 3: Физика и астрономия 2018 № 6 С. 28–33
A model for describing the distribution of magnetization over the thickness of a film of a ferromagnetic
semiconductor in an external constant electric field perpendicular to the film surface is considered. The
formulas obtained make it possible to determine the dependence of this distribution on the values of the
physical parameters of the film. ...
Added: March 1, 2019
Glushkov V. V., Demishev S. V., Samarin A. et al., Physica Status Solidi (B): Basic Research 2017 Vol. 254 No. 4 P. 1600571-1–1600571-5
Added: October 19, 2017
Khomskii D. I., K.I. Kugel, Sboychakov A. O. et al., Journal of Experimental and Theoretical Physics 2016 Vol. 122 No. 3 P. 484–498
We analyze the role of local geometry in the spin and orbital interaction in transition metal compounds with orbital degeneracy. We stress that the tendency observed in the most studied case (transition metals in O6 octahedra with one common oxygen—common corner of neighboring octahedra—and with ~180° metal–oxygen–metal bonds), that ferro-orbital ordering renders antiferro-spin coupling and, ...
Added: February 18, 2017
Kanavets V. I., Mozgovoi Y. D., Khritkin S. A., Радиотехника и электроника 2014 Т. 59 № 8 С. 836–842
Проведено численное моделирование процессов взаимодействия в электронно-позитронном веществе (ЭПВ) в рамках научного направления – гамма-электроника, в котором исследуются проблемы получения и длительного существования ЭПВ с экстремально большой энергией, выделяющейся в процессе отложенной аннигиляции. Исследованы процессы взаимодействия в ЭПВ методом классической модели крупных частиц и при использовании макроскопических волновых функций электронов и позитронов квантовой теории. В ...
Added: July 8, 2014
Kanavets V. I., Mozgovoi Y. D., Khritkin S. A., В кн.: Концентрированные потоки энергии в космической технике, электронике, экологии и медицине. Труды XIV межвузовской научной школы молодых специалистов.: М.: Московский государственный университет имени М.В. Ломоносова, Научно-исследовательский институт ядерной физики имени Д.В. Скобельцына, 2013. С. 27–32.
В основе работы лежит предположение о возможности создания квантового плазмоида путем реализации принципа тождественности при зарядовом сопряжении групп электронов и позитронов с равным числом частиц. Проводится моделирование резонансных обменных процессов в электронно-позитронном веществе с использованием одночастичных волновых функций электронов и позитронов макроскопической квантовой теории. Показано, что при оптимальном пространственном заряде наблюдается нелинейный резонансный обменный процесс, ...
Added: November 28, 2013
Kanavets V. I., Mozgovoi Y. D., Khritkin S. A., В кн.: Труды XIV Всероссийской школы-семинара «Физика и применение микроволн» (Волны-2013)Ч. 4: Квантовые явления в микроволновой физике и оптике.: М.: Физический факультет МГУ, 2013. С. 17–20.
Рассматриваются возможные квантовые аналоги классических микроволновых приборов с продольным взаимодействием (мощных клистронов, мощных релятивистских ЛБВ или ЛОВ) в задачах гамма-электроники при взаимодействии многолучевых потоков заряженных частиц разного знака. ...
Added: June 9, 2013
Kanavets V. I., Mozgovoi Y. D., Khritkin S. A., , in: Proceedings of the 14th IEEE International Vacuum Electronics Conference (IVEC-2013).: P.: Institute of Electrical and Electronics Engineers, 2013. P. 288–289.
Self-organization of electron-positron substance is considered in the problems of gammaelectronics (γ electronics), in which investigates the interaction between the electron and positron flows with electromagnetic fields in γ-wavelength range. In devices of gamma-electronics and microwave electronics important role play collective processes that allow organizing an optimal grouping of charged particles and efficient braking clots. ...
Added: June 1, 2013
Kanavets V. I., Mozgovoi Y. D., Khritkin S. A., , in: Proceedings of the 14th IEEE International Vacuum Electronics Conference (IVEC-2013).: P.: Institute of Electrical and Electronics Engineers, 2013. P. 282–283.
The technique of resonance effects analysis in the quantum exchange interaction of the electron and positron flows is developed. At the framework of macroscopic quantum theory conducted a joint decision of the Schrödinger and Poisson equations for the macroscopic wave function of the electrons and positrons. Resonance effects in the quantum exchange interaction leads to ...
Added: June 1, 2013
Kanavets V. I., Mozgovoi Y. D., Khritkin S. A., В кн.: Труды XIII Всероссийской школы-семинара «Физика и применение микроволн» (Волны-2011)Ч. 1: Микроволновая электроника (генераторы и приемники).: М.: Физический факультет МГУ, 2011. С. 27–30.
Added: March 9, 2013
Kanavets V. I., Mozgovoi Y. D., Khritkin S. A., Радиотехника и электроника 2010 Т. 55 № 4 С. 500–505
Exchange interaction of electron and positron bunches is simulated using the particle-in-cell method and macroscopic electron and positron wave functions. It is shown that a periodic exchange process with low or high nonlinearity is realized during variations in the electron and positron concentrations. ...
Added: April 17, 2012
Khritkin S. A., В кн.: Концентрированные потоки энергии в космической технике, электронике, экологии и медицине. Труды XI межвузовской научной школы молодых специалистов.: М.: Издательство МГУ, 2010. С. 103–107.
Проводится моделирование обменного взаимодействия в электронно-позитронном веществе, ведущее к динамической компенсации кулоновского поля и самоорганизации активной среды в виде макроскопического квантового сверхплазмоида. Показаны результаты расчетов распределения потенциала, приведены распределения амплитуд и фаз одночастичных волновых функций при обменном взаимодействии электронных и позитронных сгустков. ...
Added: April 13, 2012