Персона: Иванов, Андрей Анатольевич
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Андрей Анатольевич
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- ПубликацияТолько метаданныеIntrinsic Josephson junction characteristics of Nd2-xCexCuO4 /SrTiO3 epitaxial films(2024) Charikova, T. B.; Devyaterikov, D. I.; Neverov, V. N.; Popov, M. R.; Ivanov, A. A.; Иванов, Андрей Анатольевич
- ПубликацияТолько метаданныеControl over crystal, local atomic and electronic structures of cerium chromates/chromites via the synthesis conditions(2023) Popov, V. V.; Menushenkov, A. P.; Dubyago, F. E.; Yastrebtsev, A. A.; Ivanov, A. A.; Rudakov, S. G.; Попов, Виктор Владимирович; Менушенков, Алексей Павлович; Ястребцев, Алексей Алексеевич; Иванов, Андрей Анатольевич; Рудаков, Сергей Геннадьевич
- ПубликацияТолько метаданныеNormal state interlayer conductivity in epitaxial Nd2-xCexCuO4 films deposited on SrTiO3 (110) single crystal substrates(2019) Popov, M. R.; Klepikova, A. S.; Charikova, T. B.; Talantsev, E. F.; Ivanov, A. A.; Иванов, Андрей Анатольевич© 2019 IOP Publishing Ltd.In this paper we present the experimental results on the temperature dependences of c-axis resistivity, (T), for epitaxial films of n-type superconductor Nd2-xCexCuO4+δ deposited on (110) SrTiO3 single crystal substrate in a wide range of Ce content from lightly to heavily substitution regions () under an optimal annealing. Alternative empirical models were used for a description of the observed semiconductor-like dependence. An excellent quantitative depiction of the experimental dependences turned out to be possible for all investigated samples in a model of natural superlattice with temperature-dependent barrier height.
- ПубликацияОткрытый доступGreen Lithography for Delicate Materials(2021) Grebenko, A.; Bubis, A.; Motovilov, K.; Dremov, V.; Ivanov, A.; Mozhchil, R. N.; Иванов, Андрей Анатольевич© 2021 Wiley-VCH GmbHA variety of unconventional materials, including biological nanostructures, organic and hybrid semiconductors, as well as monolayer, and other low-dimensional systems, are actively explored. They are usually incompatible with standard lithographic techniques that use harsh organic solvents and other detrimental processing. Here, a new class of green and gentle lithographic resists, compatible with delicate materials and capable of both top-down and bottom-up fabrication routines is developed. To demonstrate the excellence of this approach, devices with sub-micron features are fabricated on organic semiconductor crystals and individual animal's brain microtubules. Such structures are created for the first time, thanks to the genuinely water-based lithography, which opens an avenue for the thorough research of unconventional delicate materials at the nanoscale.
- ПубликацияТолько метаданныеMagnetic susceptibility of pyrochlores R2Ti2O7: R = Gd, Dy, Tb(2020) Kuznetsov, A. V.; Churkin, O. A.; Ivanov, A. A.; Popov, V. V.; Alekseev, P. A.; Menushenkov, A. P.; Кузнецов, Алексей Владимирович; Чуркин, Олег Алексеевич; Иванов, Андрей Анатольевич; Попов, Виктор Владимирович; Алексеев, Павел Александрович; Менушенков, Алексей Павлович© 2019We present the study of magnetic susceptibility of pyrochlores Gd2Ti2O7, Dy2Ti2O7 and Tb2Ti2O7 which belong to frustrated magnets. The temperature dependence of the susceptibility χ(T) of powder samples was measured in the temperature range from 4.2 to 300 K and analyzed in the framework of mean field approximation taking into account both crystal field effects and anisotropy of the exchange interaction. We developed a simple approach allowing us to estimate interaction energies of magnetic ions from χ(T) dependences and data on wave functions of the crystal-field states of the ions using a minimum number of fitting parameters. We revealed a strong anisotropy of the exchange interaction in the paramagnetic state of Gd2Ti2O7 and obtained nearest-neighbor effective bond energies of the magnetic ions in Tb2Ti2O7 and Dy2Ti2O7 which are in good agreement with the temperatures of formation of the spin-ice state in these compounds.
- ПубликацияТолько метаданныеThe Effect of the Ln Type on the Structure and Catalytic Properties of Ln Chromites(2025) Popov, V. V.; Markova, E. B.; Zubavichus, Y. V.; Menushenkov, A. P.; Yastrebtsev, A. A.; Ivanov, A. A.; Gaynanov, B. R.; Berdnikova, M. M.; Pisarev, A. A.; Попов, Виктор Владимирович; Менушенков, Алексей Павлович; Ястребцев, Алексей Алексеевич; Иванов, Андрей Анатольевич; Гайнанов, Булат Радикович; Бердникова, Мария Михайловна; Писарев, Александр Александрович
- ПубликацияТолько метаданныеRelationship between the Surface Morphology of Thin YBa2Cu3O7 –x Films Obtained by Pulsed Laser Deposition and the Endset Temperature of Superconducting Transition(2020) Il'in, A. I.; Trofimov, O. V.; Ivanov, A. A.; Иванов, Андрей Анатольевич© 2020, Pleiades Publishing, Ltd.Abstract: A correlation was found between the endset temperature of the superconducting transition T(R = 0) of YBa2Cu3O7 – x films 100–200 nm thick, obtained by pulsed laser deposition on SrTiO3(100) substrates with a temperature of ~740°C, and the regimes of high-speed filtering of the erosion plume formed upon ablation of the material the target. Under deposition conditions, we changed the width of the filtering window, the repetition rate of the atomized material passing through the filter onto the substrate, and the radiation energy density of the KrF excimer laser on the target surface. At deposition rates of less than 0.1 nm s–1, the values of T(R = 0) did not exceed 77 K, and pyramids were formed on the surface of the films up to 80 nm in height along the c axis in the form of spirals with rectangular bases and steps of 1–2 nm along the lateral faces. With an increase in the deposition rate from 0.1 to 0.6 nm s–1, T(R = 0) increased to 86 K. These regimes corresponded to a wavy pyramid surface up to 40 nm in height with rounded bases up to 1500 nm in diameter and irregular steps 1–4 nm on the side slopes. Faceted crystals with a width from 20–30 to 500 nm in the base grew along the boundaries between the pyramids during the deposition. This morphology of the growth surface was explained by the high flow rate of the sputtered material, which is determined by the frequency filtering of the erosion plume and the energy density in the pulse upon predominantly surface diffusion.
- ПубликацияТолько метаданныеInterlayer Hall Effect in n-type doped high temperature superconductor Nd2−xCexCuO4+δ(2019) Popov, M. R.; Klepikova, A. S.; Shelushinina, N. G.; Charikova, T. B.; Ivanov, A. A.; Иванов, Андрей Анатольевич© 2019 Elsevier B.V.The in-plane and out-of-plane carrier transport and the motion of a vortex system in the high quality epitaxial films with different orientation of the c axis of electron-doped superconductors Nd2−xCexCuO4+δ in crossed magnetic and electrical fields were investigated. The activated behavior of the vortex through the barrier at low temperature between CuO2 - planes due to intrinsic interlayer pinning is found as a function of the magnetic field depending on the anisotropy resistivity coefficient.
- ПубликацияТолько метаданныеDirect nanosecond laser metallization of AlN ceramics(2024) Sviridova, A. A.; Shchekin, A. S.; Petrovskiy, V. N.; Ivanov, A. A.; Berdnikova, M. M.; Свиридова, Ангелина Алексеевна; Щекин, Александр Сергеевич; Иванов, Андрей Анатольевич; Бердникова, Мария Михайловна; Петровский, Виктор Николаевич
- ПубликацияТолько метаданныеFeatures of Pulsed Laser Annealing of BC3 Films on a Sapphire Substrate(2019) Zinin, P. V.; Filonenko, V. P.; Fominski, V. Y.; Romanov, R. I.; Solov'ev, A. A.; Vasil'evskii, I. S.; Safonov, D. A.; Ivanov, A. A.; Фоминский, Вячеслав Юрьевич; Романов, Роман Иванович; Соловьев, Алексей; Васильевский, Иван Сергеевич; Сафонов, Данил Андреевич; Иванов, Андрей Анатольевич© 2019, Pleiades Publishing, Ltd.Abstract: The morphology, chemical composition, microstructure, and electrical properties of BC3 thin films subjected to melting by a nanosecond laser pulse are investigated. The original films have been created by pulsed laser codeposition of B and C onto a sapphire substrate at 150 and 350°C. Morphological changes in the films depended on their initial structural state. However, a “frozen” structure of both films after irradiation corresponded to the B-saturated graphite-like phase, the local composition of which varied due to the formation of inclusions of amorphous boron carbide. Before and after irradiation, the films exhibited a slightly decreasing dependence of the surface resistance with increasing temperature from 4.2 to 330 K. After laser irradiation, the films resistance has decreased by a factor of ~2.6.