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Your search keyword '"Khasanov, S. S."' showing total 220 results
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220 results on '"Khasanov, S. S."'

1. Magnetoresistance of a bulk sample of FeSi

Author

Petrova, A. E., Gavrilkin, S. Yu., Stepanov, V. A., Khasanov, S. S., and Stishov, S. M.

Subjects
Condensed Matter - Strongly Correlated Electrons, 14J60
Abstract

The magnetoresistance, MR of a well-characterized bulk FeSi sample was studied. It is shown that after a chaotic behavior at temperatures below 6 K, the magnetoresistance of FeSi becomes regular functions of temperature and magnetic field. The observations suggest that the mean free path of carriers defines along with the unknown negative component the negative values of magnetoresistance of FeSi then approaching zero values at high temperatures., Comment: 5 pages, 10 figures

Published
2024

2. Superconductivity of Cu/CuOx interface formed by shock-wave pressure

Author

Palnichenko, A. V., Sidorov, N. S., Shakhrai, D. V., Avdonin, V. V., Vyaselev, O. M., and Khasanov, S. S.

Subjects
Condensed Matter - Superconductivity
Abstract

A mixture of powdered Cu and CuO has been subjected to a shock-wave pressure of 350 kbar with following quenching of the vacuum-encapsulated product to 77 K. The ac magnetic susceptibility measurements of the samples have revealed metastable superconductivity with Tc = 19.5 K, characterized by glassy dynamics of the shielding currents below Tc . Comparison of the ac susceptibility and the dc magnetization measurements infers that the superconductivity arises within the granular interfacial layer formed between metallic Cu and its oxides due to the shock-wave treatment., Comment: 6 pages, 5 figures. Physica C, 2014. arXiv admin note: substantial text overlap with arXiv:1303.7141

Published
2014
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5. Thermodynamics of the ferromagnetic phase transition in nearly half metallic CoS2 at high pressures

Author

Elkin, F. S., Zibrov, I. P., Novikov, A. P., Khasanov, S. S., Sidorov, V. A., Petrova, A. E., Lograsso, T. A., Thompson, J. D., and Stishov, S. M.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

The volume change and heat capacity at the ferromagnetic phase transition in CoS2 were measured at high pressures using X-rays generated by the Argonne synchrotron light source and by ac-calorimetry, respectively. The transition entropy, calculated on the basis of these experimental data, drops along the transition line due to quantum degradation, as required by Nernst law. The volume change increases strongly along the transition line, which is explained by specifics of the compressibility difference of coexisting phases that results from nearly half metallic nature of the ferromagnetic phase of CoS2.

Published
2013
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6. Superconductivity of Mg/MgO interface formed by shock-wave pressure

Author

Sidorov, N. S., Palnichenko, A. V., Shakhrai, D. V., Avdonin, V. V., Vyaselev, O. M., and Khasanov, S. S.

Subjects
Condensed Matter - Superconductivity
Abstract

A mixture of Mg and MgO has been subjected to a shock-wave pressure of 170 kbar. The ac susceptibility measurements of the product has revealed a metastable superconductivity with Tc=30 K, characterized by glassy dynamics of the shielding currents below Tc. Comparison of the ac susceptibility and the dc magnetization measurements infers that the superconductivity arises within the interfacial layer formed between metallic Mg and its oxide due to the shock-wave treatment.

Published
2013
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7. Superconductivity in the metallic-oxidized magnesium interface

Author

Sidorov, N. S., Palnichenko, A. V., and Khasanov, S. S.

Subjects
Condensed Matter - Superconductivity
Abstract

Metastable superconductivity at 39 - 54 K in the interfaces formed by metallic and oxidized magnesium (MgO) has been observed by ac magnetic susceptibility measurements. The superconducting interfaces have been produced by the surface oxidation of metallic magnesium under special conditions., Comment: 8 pages, 4 figures; Solid State Communications, 2012

Published
2012
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31. The evolution of the spectral and structural characteristics of La-=SUB=-0.98-x-=/SUB=-Lu-=SUB=-x-=/SUB=-Eu-=SUB=-0.02-=/SUB=-BO-=SUB=-3-=/SUB=- orthoborates

Author

null Khasanov S. S., null Zver'kova I. I., null Fursova T. N, null Kiselev A. P, null Kedrov V. V., and null Shmurak S. Z

Abstract

The structure, IR absorption, luminescence, and luminescence excitation spectra of La0.98-xLuxEu0.02BO3 orthoborates synthesized at 970oC were studied at 0≤ x≤0.98. An increase in x leads to a sequential change of the structural state of the orthoborates. At first, the compound has the aragonite structure. Then, it becomes two-phase and contains the aragonite and vaterite phases. With a further increase in x, the compounds have the vaterite structure, then the vaterite and calcite structure, and, finally, the calcite structure. Correspondence between the structure and spectral characteristics of these compounds was established. Luminescence spectra were investigated at different wavelengths of exciting light. This allowed obtaining information on the structure of a near-surface layer and the bulk of microcrystals of the investigated samples. It is shown that the vaterite phase arises in the bulk of microcrystals of samples that have the aragonite structure. Keywords: phosphors for LEDs, rare earth orthoborates, X-ray diffraction analysis, IR spectroscopy, luminescence spectra.

Published
2022

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