Zobrazeno 1 - 10 of 71 pro vyhledávání: '"Bar'yakhtar, V. G."'
1
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Dynamics and relaxation in spin nematics
Autor: Bar'yakhtar, V. G., Butrim, V. I., Kolezhuk, A. K., Ivanov, B. A.
Publikováno v: Phys. Rev. B 87, 224407 (2013)
We study dynamics and relaxation of elementary excitations (magnons) in the spin nematic (quadrupole ordered) phase of S=1 magnets. We develop a general phenomenological theory of spin dynamics and relaxation for spin-1 systems. Results of the phenom
Externí odkaz: http://arxiv.org/abs/1303.1194
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2
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Correlated Coherent States - Quantum Analogue Of Thermal States.(On The Problem Of Incorporating Thermodynamics Into Quantum Theory)
Autor: Sukhanov, A. D., Golubjeva, O. N., Bar'yakhtar, V. G.
In this paper, we show that correlated coherent states (CCSs) are the most adequate candidates for the role of quantum analogues of the thermal states. The main result of our study reduces to the fact that quantum thermal effects under conditions of
Externí odkaz: http://arxiv.org/abs/1211.3900
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3
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Squeezed coherent states as thermal-like ones (on the problem of incorporating thermodynamics into quantum theory)
Autor: Sukhanov, A. D., Golubeva, O. N., Bar'yakhtar, V. G.
In our paper [1], we proposed an original approach to the incorporation of stochastic thermodynamics into quantum theory. It is based on the concept of consistent inclusion of the holistic stochastic environmental influence modeled by arbitrary Bogol
Externí odkaz: http://arxiv.org/abs/1211.3017
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4
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Equations of one-dimensional hydrodynamics with quantum thermal fluctuations taken into account
Autor: Golubjeva, O. N., Sukhanov, A. D., Bar'yakhtar, V. G.
We propose a generalization of equations of quantum mechanics in the hydrodynamic form by introducing the terms taking into account the diffusion velocity at zero and finite temperatures and the density energy of diffusion pressure of the thermal vac
Externí odkaz: http://arxiv.org/abs/1112.1598
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5
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Modified Thermodynamics as an Approach to the Description of some Universal Properties of 'Nearly Perfect Fluids'
Autor: Sukhanov, A. D., Bar'yakhtar, V. G., Golubjeva, O. N.
Publikováno v: Ukrainian Journal of Physics, 2009, Vol. 54, no. 1-2, pp. 207-215
We show that the quantum statistical mechanics describing quantum and thermal properties of objects has only the sense of a particular semiclassical approximation. We propose a more general (than that theory) microdescription of objects in a heat bat
Externí odkaz: http://arxiv.org/abs/1012.5054
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7
Damping of Magnetoelastic Waves
Autor: Bar’yakhtar, V. G., Danilevich, A. G.
Publikováno v: Ukrainian Journal of Physics; Vol. 65 No. 10 (2020); 912
Український фізичний журнал; Том 65 № 10 (2020); 912
A general method for constructing a model of the dissipative function describing the relaxation processes induced by the damping of coupled magnetoacoustic waves in magnetically ordered materials has been developed. The obtained model is based on the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=issn20710194::b1f2ec0f948e598e6c5242c672787fef
https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2020205
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8
Magnetoelastic Waves in Ferromagnets in the Vicinity of Lattice Structural Phase Transitions
Autor: Bar’yakhtar, V. G., Danilevich, A. G.
Publikováno v: Ukrainian Journal of Physics; Vol. 13 No. 1 (2018): Reviews; 3
Український фізичний журнал; Том 13 № 1 (2018): Огляди; 3
The dispersion laws for coupled magnetoelastic waves in ferromagnets with uniaxial or cubic symmetry have been calculated. The features of obtained dispersion laws in the vicinity of spin-reorientation phase transitions are analyzed. The interaction
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=issn20710194::428315bd9ce4970c8038f328ca96a432
https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018603
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9
A Ratio of the Shear Viscosity to the Density of Entropy for Helium
Autor: Bar’yakhtar, V. G., Belokolos, E. D., Golubeva, O. N., Sukhanov, A. D.
Publikováno v: Ukrainian Journal of Physics; Vol. 59 No. 2 (2014); 155
Український фізичний журнал; Том 59 № 2 (2014); 155
We have studied the ratio (n/s) of the shear viscosityn to the density of entropys for helium as a function of the temperature and have established that the minimal value, (n/s)min, satisfies the Kovtun–Son–Starinets inequality, (n/s)min ≥ (h/4
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=issn20710194::88cb18c38f74f1f70bfa15353b9f78b4
https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018424
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10
Phenomenological Theory of Relaxation in Two-Sublattice Ferrite
Autor: Bar’yakhtar, V. G., Ivanov, B. A., Golubjeva, O. N., Sukhanov, A. D.
Publikováno v: Ukrainian Journal of Physics; Vol. 58 No. 12 (2013); 1149
Український фізичний журнал; Том 58 № 12 (2013); 1149
The dissipative function of a two-sublattice ferrite was constructed. The relaxation times for the acoustic and optical branches of spin waves are calculated, as well as the relaxation times for the magnetization and antiferromagnetism vectors. The p
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=issn20710194::05f3c4d4879dbb19c6e96317d8f7bd09
https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018396
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