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Природа ферромагнитной фазы Гриффитса
Доклады Российской академии наук. Физика, технические науки (ранее - Доклады Академии Наук. Физика). 2025. Т. 521. С. 31–38.
Demishev S. V.
A simple model of a disordered cluster ferromagnetic phase is proposed, in which magnetic disorder is determined by random local magnetic fields Hl with a power-law distribution function (x < 1), which allows analytically describing the experimentally known magnetic properties of Griffiths ferromagnetic phases from a unified point of view, including the transition from the Curie-Weiss law for magnetic susceptibility to an anomalous power-law dependence in the range of temperature T exceeding the Curie temperature TC. The developed approach makes it possible for the first time to explain the appearance of a power-law dependence of magnetization M on the magnetic field H, , in the ferromagnetic region T < TC and to propose a method for experimental determination of the order parameter. Comparison with experimental data leads to conclusion that it is precisely the disorder of this type that plays the main role in ferromagnetic Griffiths systems, and the division into magnetic clusters should be valid for temperatures both above and below the Curie point. It is shown that the peculiarities of the magnetic properties of the Griffiths cluster system are not associated with the anomalous behavior of the magnetization of an individual cluster, but arise as a result of the disorder-induced modification of the integral characteristics of a disordered ferromagnet.
Dmitriev A., Kornilov V., Batienkov R., Lecture Notes in Civil Engineering 2026 Vol. 886 P. 249–255
Numerous studies have provided compelling evidence that the probability distribution of avalanche sizes follows a power law, and that 1/f noise is present in the stochastic dynamics of landslides. We present a theoretical explanation of these phenomena within the framework of self-organized criticality theory, proposing a discrete-time model in the form of a sandpile cellular ...
Added: October 13, 2026
Dmitriev A., Shulman I., Lebedev A., Studies in Computational Intelligence 2026 Vol. 1265 P. 266–273
A discrete-time model is presented for the self-organization of the X/Twitter social network to the edge of a phase transition, characterized by avalanche-like propagation of information in the network. The model is based on the analogy between the critical dynamics of the X social network and sandpile cellular automata with Manna rule on the Chung-Lu ...
Added: October 13, 2026
Arutyunov K., Kharitonov I. A., Petrosyants K. O., JETP Letters 2026 Vol. 124 No. 6 P. 1–16
Superconducting properties of metallic micro- and nanowires can be entirely different from those of bulk superconductors. Of particular interest is the nonequilibrium current-induced state of a quasi-one-dimensional superconducting channel. The most interesting phenomenon here is the stepped I–V characteristic, explained by a process known as phase slip center activation. If the origin of such step-like ...
Added: October 13, 2026
Makarov D. M., Kalikin N., Fashchevsky K. A. et al., Electrochimica Acta 2026 Vol. 579 Article 150159
Machine learning (ML) has become a powerful tool for accelerating the development of carbon-based supercapacitors;
however, most published models assume that a single predictive framework can describe both conventional
porous carbons and hybrid carbon electrodes. Here, we test this assumption using a comprehensive
benchmark dataset and an extended literature-curated dataset enriched with synthesis- and electrolyte-related
descriptors. Three ML algorithms ...
Added: October 13, 2026
Махлуф М., Ozhegov R., Elezov M. et al., Фотоника 2026 Vol. 20 No. 6 P. 414–423
This paper compares the ranging precision of direct time-of-flight (dToF) and non-line-of-sight (NLOS) LiDAR architectures, both using a superconducting nanowire single-photon detector (SNSPD). Both systems operate at 1550 nm with a 50 ps pulsed laser and time-correlated single-photon counting (TCSPC). The dToF configuration achieved approximately 100 µm precision at 10 m, while the NLOS configuration achieved 500 µm precision for ...
Added: October 12, 2026
Singapore: Springer, 2026.
This volume presents the Proceedings of the 34th IUPAP Conference on Computational Physics (CCP2023), held in Kobe, Japan on August 4–8, 2023. It offers a collection of peer-reviewed articles that highlight recent developments in computational and simulation research across various areas of physics. Key topics include the use of data science, quantum computing, and machine ...
Added: October 12, 2026
Goncharov A., Chibisov A., Advanced Theory and Simulations 2023 Vol. 12 No. 13 Article 2200816
Designing stable quantum computers with the ability to correct errors responsibly requires a detailed understanding of the physical processes that underlie these devices. In this study, detailed quantum mechanical simulations of the atomic structure, charge distribution of electron density, and distribution and orientation of magnetic and quantum states as a function of applied external pressure ...
Added: October 11, 2026
Chibisov A., Gnidenko A., Chibisova M. et al., FlatChem 2023 Vol. 41 Article 100533
Manufacturing precise quantum computers with small errors in quantum operations, long coherence times, and low power consumption is the most important challenge in modern nanoelectronics. To understand the operating modes of such calculators in detail, both the optimal arrangement of the qubit system within the structure and changes in its magnetic properties must be comprehensively ...
Added: October 11, 2026
S. A. Andreeva, Orlov O. V., A. V. Shchepetilnikov et al., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 114 No. 6 Article 065420
We investigate the temperature dependence of the pseudospin phase transition at filling factor 𝜈=2 in the quantum Hall regime. Experiments were performed on a high-quality, wide AlAs quantum well, where the pseudospin degree of freedom arises naturally from the near degeneracy and equivalence of the two conduction-band valleys. The anisotropic 𝑔-factor inherent to AlAs enabled independent measurement of ...
Added: July 31, 2026
Ya. I. Rodionov, Rozhkov A. V., Beck M. E. et al., Physical Review B: Condensed Matter and Materials Physics 2025 Vol. 112 No. 20 P. –
We theoretically investigate a model with electrons and holes whose Fermi surfaces are perfectly nested. The fermions are assumed to be interacting, both with each other and with the lattice. To suppress inhomogeneous states, a sufficiently strong long-range Coulomb repulsion is included into the model. Using the mean field approximation, one can demonstrate that, in ...
Added: February 18, 2026
Милютин Д. П., Pugach N., В кн.: ТЕЗИСЫ IV Международной конференции «Физика конденсированных состояний» ФКС-2025.: Черноголовка: [б.и.], 2025. С. 111–111.
Сверхпроводниковый эффект близости представляет особый интерес для изучения из-за возможности широкого применения в квантовых технологиях. Гетероструктура сверхпроводник-изолятор-нормальный металл (NIS) стала популярной для изучения сверхнизких температур, благодаря эффекту, схожем с эффектом Пельтье.
Теоретически было показано, что возможно достичь температуры 50 мК, стартуя с 300
мК. Однако, эффективному охлаждению мешает подщелевой ток, возникающий в
результате, андреевского отражения. Лучший способ для его ...
Added: September 6, 2025
Demishev S. V., Краснорусский В. Н., Оськин А. Е. et al., Письма в Журнал экспериментальной и теоретической физики 2025 Т. 121 № 2 С. 121–128
Magnetic properties of Mn1 xRhxSi solid solutions with non-centrosymmetric structure B20 synthesized at high pressures and temperatures (8 GPa, 1500-1770 K) were studied in detail in a wide temperature range of 2-300 K in a magnetic field of up to 9 T. For compositions from the range 0.15≤x≤0.8, an anomalous increase in the Curie temperature ...
Added: February 9, 2025
Marychev P. M., Chen Y., The Journal of Physical Chemistry Letters 2023 Vol. 14 No. 51 P. 11573–11579
In this work, we investigate the intertype (IT) domain in strongly disordered ferromagnetic superconductors with a Curie temperature lower than the superconducting critical temperature. In such unique materials, the coexistence of superconductivity and ferromagnetism allows for the exploration of both unconventional superconductivity and the interplay between magnetism and superconductivity. The study utilizes an extended Ginzburg-Landau ...
Added: December 19, 2023
Vagov A., Tiago T. Saraiva, Arkady A. Shanenko et al., Communications Physics 2023 Vol. 6 Article 284
In many pnictides the superconductivity coexists with ferromagnetism in an accessible range of temperatures and compositions. Recent experiments revealed that when the temperature of magnetic ordering Tm is below the superconducting transition temperature Tc, highly non-trivial physical phenomena occur. In this work we demonstrate the existence of a temperature window, situated between Tm and Tc, where these intrinsically type-II superconductors are ...
Added: October 18, 2023
Golikova T. E., Wolf M. J., Beckmann D. et al., Superconductor Science and Technology 2021 Vol. 34 No. 9 Article 095001
A nonmonotonic dependence of the critical Josephson supercurrent on the injection current
through a normal metal/ferromagnet weak link from a single domain ferromagnetic strip has
been observed experimentally in nanofabricated planar crosslike S-N/F-S Josephson structures.
This behavior is explained by 0–π and π–0 transitions, which can be caused by the suppression
and Zeeman splitting of the induced superconductivity due ...
Added: June 7, 2021
Pugach N., Джепаров Д. И., Гусев Н., [б.и.], 2020.
СБОРНИК ТЕЗИСОВ
МЕЖДУНАРОДНОЙ НАУЧНОЙ КОНФЕРЕНЦИИ
«УФИМСКАЯ ОСЕННЯЯ МАТЕМАТИЧЕСКАЯ ШКОЛА – 2020» ...
Added: December 26, 2020
Zvezdin A., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 P. 174427
Magneto-optical spectroscopy in fields up to 30 T reveals anomalies in the equilibrium and ultrafast magnetic properties of the ferrimagnetic rare-earth–transition-metal alloy TbFeCo. In particular, near the magnetization compensation temperature, each of the magnetizations of the antiferromagnetically coupled Tb and FeCo sublattices show triple hysteresis loops. Contrary to state-of-the-art theory, which explains such loops by ...
Added: November 27, 2019
Stroganov P. L., Ya.V. Fominov, Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 96 No. 17 P. 174508-1–174508-13
We consider ballistic SQUIDs with spin filtering inside half-metallic ferromagnetic arms. A singlet Cooper pair
cannot pass through an arm in this case, so the Josephson current is entirely due to the Cooper pair splitting, with
two electrons going to different interferometer arms. In order to elucidate the mechanisms of Josephson transport
due to split Cooper pairs, we ...
Added: November 17, 2017
Kolokolov I., Journal of Experimental and Theoretical Physics 1986 Vol. 64 No. 6 P. 1373–1375
Added: March 31, 2017
Kolokolov I., Podivilov E., Journal of Experimental and Theoretical Physics 1989 Vol. 68 No. 1 P. 119–125
Added: March 30, 2017
Kolokolov I., International Journal of Modern Physics B 1996 Vol. 10 No. 18-19 P. 2189–2215
A number of problems in statistical physics can be reformulated in terms of a two-state system evolving in a random field. The corresponding evolution operator can be written in the form of time-ordered operator exponential. Functional formalism allows us to rewrite the latter as a product of usual matrix exponentials using a nonlinear change of ...
Added: March 28, 2017
Leksin P. V., Kamashev A. A., Garif'yanov N. N. et al., Physics of the Solid State 2016 Vol. 58 P. 2165–2176
An important role of the morphology of a superconducting layer in the superconducting spin-valve
effect has been established. The triplet pairing induced by the superconductor/ferromagnet proximity effect
has been experimentally investigated for samples CoO x /Py1/Cu/Py2/Cu/Pb (where Py = Ni 0.81 Fe 0.19 ) with
a smooth superconducting layer. The optimization of the parameters of this structure has ...
Added: December 1, 2016
Garifullin I. A., Garif'yanov N. N., Leksin P. V. et al., Magnetic Resonance in Solids 2014 Vol. 16 P. 14208
Review of our recent results concerning the spin valve effect are presented. Using the spin switch design F1/F2/S proposed theoretically that comprises a ferromagnetic bilayer (F1/F2) as a ferromagnetic component, and an ordinary superconductor (S) as the second interface component, we have realized for the first time a full spin switch effect for the superconducting ...
Added: October 14, 2016
Garifullin I. A., Garif'yanov N. N., Leksin P. V. et al., Bulletin of the Russian Academy of Sciences: Physics 2014 Vol. 78 P. 1341–1347
A review of recent works on spin valves is presented. A number of CoO/Fe1/Cu/Fe2/S multilayers
(S = In or Pb) are prepared and studied in detail. The full spin-valve effect for the superconducting current
in these heterostructures is realized for the first time; its sign-changing oscillatory behavior is observed,
depending on the thickness of the Fe2 layer; and ...
Added: October 14, 2016