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3 results on '"Vladislav O. Zhupanov"'

1. Ambient Pressure Synthesis of Re-Substituted MnGe and Its Magnetic Properties

Author

Vladislav O. Zhupanov, Roman A. Khalaniya, Alexey V. Bogach, Valeriy Yu. Verchenko, Maxim S. Likhanov, and Andrei V. Shevelkov

Subjects
B20-type structure, manganese monogermanide, magnetic properties, rhenium, Crystallography, QD901-999
Abstract

Due to their non-centrosymmetric structure, B20-type compounds have intriguing properties of chiral magnets and are the objects of study of topological spin textures. Among them is a high-pressure phase MnGe, which demonstrates properties of magnetic skyrmions. We report on the synthesis of an Mn1−xRexGe solid solution with the B20 structure, which can be prepared without the application of high pressure. Mn1−xRexGe (x = 0.169(6)) shows unconventional magnetic behavior, where the Neel temperature is only slightly reduced compared to a chiral-lattice helimagnet MnGe.

Published
2022
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3. Synthesis, extended and local crystal structure, and thermoelectric properties of Fe1-xRexGa3 solid solution

Author

Dina I. Fazlizhanova, Valeriy Yu. Verchenko, S. V. Zhurenko, Maxim S. Likhanov, A. A. Gippius, David Berthebaud, Vladislav O. Zhupanov, A. V. Tkachev, Andrei V. Shevelkov, Lomonosov Moscow State University (MSU), National Institute of Chemical Physics and Biophysics = Keemilise ja bioloogilise füüsika instituut [Estonie] (NICPB | KBFI), P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] (LPI RAS), Russian Academy of Sciences [Moscow] (RAS), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Российский Фонд Фундаментальных Исследований (РФФИ), RFBR 17-03-00111, 16-53-52012, Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Laboratoire de Microélectronique et de Physique des Semiconducteurs (LaMIPS), and Normandie Université (NU)-NXP Semiconductors [France]

Subjects
Materials science, Intermetallics, Solid solution, Band gap, 02 engineering and technology, Crystal structure, Conductivity, NQR spectroscopy, 010402 general chemistry, 01 natural sciences, Thermoelectric effect, Materials Chemistry, [CHIM.CRIS]Chemical Sciences/Cristallography, [CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS, business.industry, Mechanical Engineering, Thermoelectric, Metals and Alloys, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Semiconductor, Rhenium, Mechanics of Materials, Chemical physics, Charge carrier, 0210 nano-technology, Valence electron, business
Abstract

International audience; We present a new Fe1–xRexGa3 solid solution, in which a 5d-metal––rhenium––partially substitutes for iron to the limiting composition of x = 0.10. The crystal structure refined for the composition Fe0.91Re0.09Ga3 shows the expected increase in the unit cell parameters compared to the parent FeGa3 compound, however the M–M (M = Fe, Re) distance decreases within the M–M dumbbell, indicating an increased M–M bonding density. Therein, investigation of the local structure by means of 69,71Ga NQR spectroscopy revealed the formation of homonuclear Fe–Fe and Re–Re dumbbells. Transport and thermoelectric properties have been investigated for the Re-substituted FeGa3. Electrical transport measurements showed preservation of the nonmetallic conductivity of Fe1–xRexGa3 despite the decrease of the valence electron concentration from 17 to 16.9 electrons per formula. At low temperatures, Fe1–xRexGa3 is a p-type semiconductor with the band gap of 0.4 eV, but with increasing temperature the sign of the dominant charge carriers changes. Owing to the alloying effect, Fe1–xRexGa3 displays 1.5 times lower thermal conductivity than FeGa3, which increases at high temperatures because of the growing contribution of the electronic term. © 2019

Published
2019

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