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328 results on '"Korableva, S. L."'

1. Strongly anisotropic magnetocaloric effect in a dipolar magnet LiGdF$_4$

Author

Andreev, G. Iu., Romanova, I. V., Morozov, O. A., Korableva, S. L., Batulin, R. G., Glazkov, V. N., and Sosin, S. S.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

We report the detailed study of the magnetocaloric effect (MCE) in a dipolar-Heisenberg magnet LiGdF$_4$ using magnetization measurements performed on a single crystal sample. Entropy variation on isothermal demagnetization from the magnetic field up to 3 T is determined in the temperature range 2-10 K for two principal directions of the applied field (parallel and perpendicular to the tetragonal $c$-axis of the crystal). The MCE is found to be highly anisotropic, with the cooling efficiency being up to twice higher at $H\parallel c$. The results are nicely interpreted in the frame of a conventional molecular field approach taking into account considerable anisotropy of the paramagnetic Curie-Weiss temperature. These results are compared to earlier studies of MCE in powder samples of LiGdF$_4$ [T. Numazawa et al., AIP Conf. Proc. 850, 1579 (2006)] as well as with analogous data for other well known magnetocaloric materials. Our findings may open new possibilities to enhance the efficiency of magnetic refrigeration in the liquid helium-4 temperature range., Comment: 4 pages, 3 figures

Published
2023

3. Microscopic spin Hamiltonian for a dipolar-Heisenberg magnet LiGdF4 from EPR measurements

Author

Sosin, S. S., Iafarova, A. F., Romanova, I. V., Morozov, O. A., Korableva, S. L., Batulin, R. G., Zhitomirsky, M., and Glazkov, V. N.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Low-temperature electron paramagnetic resonance measurements are performed on single crystals of LiY_{1-x}Gd_xF_4 with weak x=0.005 and moderate x=0.05 concentration of Gd ions. Modeling of the experimental spectra allows us to precisely determine microscopic parameters of the spin Hamiltonian of the parent LiGdF4 material, including the nearest-neighbor exchange constant. The obtained parameters are further tested by comparing a strongly anisotropic Curie-Weiss temperature obtained for LiGdF4 in our static magnetization measurements with theoretically computed values. We find a fine balance between principal magnetic interactions in LiGdF4, which results in a hidden magnetic frustration presumably leading to a delayed magnetic ordering and an enhanced magnetocaloric effect at low temperatures., Comment: 6 pages, 6 figures

Published
2022
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6. Optical vector network analysis of ultra-narrow transitions in $^{166}$Er$^{3+}$:$^7$LiYF$_4$

Author

Kukharchyk, N., Sholokhov, D., Morozov, O., Korableva, S. L., Cole, J. H., Kalachev, A. A., and Bushev, P. A.

Subjects
Physics - Instrumentation and Detectors, Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Optics, Quantum Physics
Abstract

We present optical vector network analysis (OVNA) of an isotopically purified $^{166}$Er$^{3+}$:$^7$LiYF$_4$ crystal. The OVNA method is based on generation and detection of modulated optical sideband by using a radio-frequency vector network analyzer. This technique is widely used in the field of microwave photonics for the characterization of optical responses of optical devices such as filters and high-Q resonators. However, dense solid-state atomic ensembles induce a large phase shift on one of the optical sidebands which results in the appearance of extra features on the measured transmission response. We present a simple theoretical model which accurately describes the observed spectra and helps to reconstruct the absorption profile of a solid-state atomic ensemble as well as corresponding change of the refractive index in the vicinity of atomic resonances., Comment: 4 pages, 5 figures

Published
2018
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11. Development of various methods for PrF3 nanoparticles synthesis

Author

Alakshin, E. M., Gabidullin, B. M., Gubaidullin, A. T., Klochkov, A. V., Korableva, S. L., Neklyudova, M. A., Sabitova, A. M., and Tagirov, M. S.

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The six nanosized PrF3 samples were synthesized using two different chemical reactions and different time of hydrothermal reaction. The X-ray and HRTEM experiments showed high crystallinity of synthesized samples. For all samples the particles size distribution was obtained. It was shown, that precursors of chemical reaction have influence on the shape of synthesized nanoparticles. The size of nanoparticles depended on the time of hydrothermal reaction as much as roughly 10 nm per hour.

Published
2011

12. NMR of 3He in contact with PrF3 nanoparticles at low temperatures

Author

Tagirov, M. S., Alakshin, E. M., Gazizulin, R. R., Egorov, A. V., Klochkov, A. V., Korableva, S. L., Kuzmin, V. V., Nizamutdinov, A. S., Kono, K., Nakao, A., and Gubaidullin, A. T.

Subjects
Condensed Matter - Other Condensed Matter, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Two nanosized PrF3 samples were synthesized using two different procedures. The X-ray and HRTEM experiments showed high crystallinity of synthesized sample. Comparison of enhanced 141Pr NMR spectra of microsized (45 $\mu$m) and nanosized PrF3 powder is presented. Experimental data on spin kinetics of 3He in contact with PrF3 nanoparticles at T = 1.5 K are reported., Comment: submitted to JLTP

Published
2010
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13. Synthesis and Magnetic Properties of the Nd3+ Ion in the CsCaF3 Single Crystal.

Author

Falin, M. L., Latypov, V. A., and Korableva, S. L.

Abstract

A CsCaF3 single crystal doped with Nd3+ ions is studied using electron paramagnetic resonance spectroscopy. A paramagnetic Nd3+ center of trigonal symmetry is recorded. The parameters of the corresponding spin Hamiltonians, the ground states and their wave functions are determined. Structural models of the observed complexes are proposed. The experimental results are analyzed in comparison with those for the same paramagnetic ion in other lattices. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Detection of nanocracks on double fluoride rare earth crystal surface

Author

Abdulsabirov, R. Yu., Bukharaev, A. A., Zhdanov, M. R., Zhdanov, R. Sh., Klochkov, A. V., Korableva, S. L., Naletov, V. V., Nurgazizov, N. I., Tagirov, M. S., and Tayurskii, D. A.

Subjects
Condensed Matter - Materials Science
Abstract

Predicted earlier, microcracks on the crystal surface of both finely dispersed $LiYF_4$ powders and single crystals of the Van Vleck paramagnet $% LiTmF_4$ were detected by using the NMR Cryoporometry and Atomic-Force Microscopy technique., Comment: 5 pages, 2 Postscript and 3 JPEG figures, LaTEX

Published
1998
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20. Advantage of single crystals in magnetic refrigeration of a dipolar magnet LiGdF$_4$

Author

Andreev, G. Iu., Romanova, I. V., Morozov, O. A., Korableva, S. L., Batulin, R. G., Glazkov, V. N., and Sosin, S. S.

Subjects
Strongly Correlated Electrons (cond-mat.str-el), Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences
Abstract

We report the detailed study of the magnetocaloric effect (MCE) in a dipolar-Heisenberg magnet LiGdF$_4$ using magnetization measurements performed on a single crystal sample. Entropy variation on isothermal demagnetization from the magnetic field up to 3 T is determined in the temperature range 2-10 K for two principal directions of the applied field (parallel and perpendicular to the tetragonal $c$-axis of the crystal). The MCE is found to be highly anisotropic, with the cooling efficiency being up to twice higher at $H\parallel c$. The results are nicely interpreted in the frame of a conventional molecular field approach taking into account considerable anisotropy of the paramagnetic Curie-Weiss temperature. These results are compared to earlier studies of MCE in powder samples of LiGdF$_4$ [T. Numazawa et al., AIP Conf. Proc. 850, 1579 (2006)] as well as with analogous data for other well known magnetocaloric materials. Our findings may open new possibilities to enhance the efficiency of magnetic refrigeration in the liquid helium-4 temperature range., 4 pages, 3 figures

Published
2023
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34. Manifestation of Memory and Butterfly in the Photon Echo on Erbium Ions in LuLiF4 and YLiF4.

Author

Shegeda, A. M., Korableva, S. L., Morozov, O. A., Lisin, V. N., Solovarov, N. K., and Tarasov, V. F.

Subjects
*ERBIUM, *PHOTON echoes, *MAGNETIC fields, *BUTTERFLIES, *MEMORY, *IONS
Abstract

The memory effect in the form of hysteresis has been detected in the measured dependence of the intensity of the photon echo in YLiF4 and LuLiF4 samples with Er3+ impurity ions on the orientation, strength, and variation direction of the magnetic field. The prehistory of the location of a sample in the magnetic field with a certain direction and strength is written and stored for no less than 6 h at a temperature of 2 K. The effect crucially depends on the orientation of the optical axis of the sample with respect to the external magnetic field. [ABSTRACT FROM AUTHOR]

Published
2023
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35. Manifestation of Memory and Butterfly in the Photon Echo on Erbium Ions in LuLiF4 and YLiF4.

Author

Shegeda, A. M., Korableva, S. L., Morozov, O. A., Lisin, V. N., Solovarov, N. K., and Tarasov, V. F.

Subjects
ERBIUM, PHOTON echoes, MAGNETIC fields, BUTTERFLIES, MEMORY, IONS
Abstract

The memory effect in the form of hysteresis has been detected in the measured dependence of the intensity of the photon echo in YLiF4 and LuLiF4 samples with Er3+ impurity ions on the orientation, strength, and variation direction of the magnetic field. The prehistory of the location of a sample in the magnetic field with a certain direction and strength is written and stored for no less than 6 h at a temperature of 2 K. The effect crucially depends on the orientation of the optical axis of the sample with respect to the external magnetic field. [ABSTRACT FROM AUTHOR]

Published
2023
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36. Microscopic Spin Hamiltonian for a Dipolar Heisenberg Magnet LiGdF4 from EPR Measurements.

Author

Sosin, S. S., Iafarova, A. F., Romanova, I. V., Morozov, O. A., Korableva, S. L., Batulin, R. G., Zhitomirsky, M., and Glazkov, V. N.

Subjects
MAGNETOCALORIC effects, ELECTRON paramagnetic resonance, MAGNETIZATION measurement, SINGLE crystals, LOW temperatures, HYPERFINE structure
Abstract

Low-temperature electron paramagnetic resonance measurements are performed on single crystals of LiY1 ‒xGdxF4 with low and moderate concentration of Gd ions. Modeling of the experimental spectra allows us to precisely determine microscopic parameters of the spin Hamiltonian of the parent LiGdF4 material, including the nearest-neighbor exchange constant. The obtained parameters are further tested by comparing a strongly anisotropic Curie–Weiss temperature obtained for LiGdF4 in our static magnetization measurements with theoretically computed values. We find a fine balance between principal magnetic interactions in LiGdF4, which results in a hidden magnetic frustration presumably leading to a delayed magnetic ordering and an enhanced magnetocaloric effect at low temperatures. [ABSTRACT FROM AUTHOR]

Published
2022
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