Oleksandr Kotlyar

Engineering & Applied Science
Research Associate, Aston Institute of Photonics Technology (AIPT)

https://orcid.org/0000-0002-2744-0132

School of Engineering and Applied Science, Aston University
B4 7ET Birmingham
United Kingdom

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Research Output 2006 2019

16 Article
2 Conference contribution
2 Paper
1 Comment/debate

16 results
Publication Year, Title (descending)

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2019

The phenomenon of conversion polymorphism in Bi-containing metastable perovskites

Khalyavin, D. D., Salak, A. N., Fertman, E. L., Kotlyar, O. V., Eardley, E., Olekhnovich, N. M., Pushkarev, A. V., Radyush, Y. V., Fedorchenko, A. V., Desnenko, V. A., Manuel, P., Ding, L., Čižmár, E. & Feher, A., 16 Apr 2019, In : Chemical Communications. 55, 32, p. 4683-4686 4 p.

Research output: Contribution to journal › Article

Polymorphism

Hot Temperature

Pressure

Metastable phases

Perovskite

2017

Magnetic properties of the Bi _0.65 La _0.35 Fe _0.5 Sc _0.5 O ₃ perovskite

Fedorchenko, A. V., Fertman, E. L., Desnenko, V. A., Kotlyar, O. V., Čižmár, E., Shvartsman, V. V., Lupascu, D. C., Salamon, S., Wende, H., Salak, A. N., Khalyavin, D. D., Olekhnovich, N. M., Pushkarev, A. V., Radyush, Y. V. & Feher, A., 1 Apr 2017, In : Acta Physica Polonica A. 131, 4, p. 1069-1071 3 p.

Research output: Contribution to journal › Article

magnetic properties

magnetic moments

magnetic fields

anomalies

magnetization

Multiferroic Bi _0.65 La _0.35 Fe _0.5 Sc _0.5 O ₃ perovskite: Magnetic and thermodynamic properties

Fertman, E. L., Fedorchenko, A. V., Khalyavin, D. D., Salak, A. N., Baran, A., Desnenko, V. A., Kotlyar, O. V., Čižmár, E., Feher, A., Syrkin, E. S., Vaisburd, A. I., Olekhnovich, N. M., Pushkarev, A. V., Radyush, Y. V., Stanulis, A. & Kareiva, A., 1 May 2017, In : Journal of Magnetism and Magnetic Materials. 429, p. 177-181 5 p.

Research output: Contribution to journal › Article

Open Access

File

Perovskite

Magnetic properties

Thermodynamic properties

thermodynamic properties

magnetic properties

2016

Electronic structure and magnetic properties of fete, bifeo₃, srfe₁₂o₁₉ and srcotife₁₀o₁₉ compounds

Lyogenkaya, A. A., Grechnev, G. E., Kotlyar, O. V., Panfilov, A. S. & Gnezdilov, V. P., 1 Jan 2016, In : Ukrainian Journal of Physics. 61, 6, p. 523-530 8 p.

Research output: Contribution to journal › Article

File

density functional theory

electronic structure

magnetic properties

iron

gradients

Electronic structure and magnetic properties of RT₄Al₈ (R = Sc, Y, La, Lu; T = Fe, Mn, Cr) compounds. Hydrostatic pressure effects

Zhuravleva, I. P., Grechnev, G. E., Panfilov, A. S., Lyogenkaya, A. A., Kotlyar, O. V., Fedorchenko, A. V. & Feher, A., 7 Jul 2016, In : Low Temperature Physics. 42, 6, p. 458-465 8 p.

Research output: Contribution to journal › Article

Open Access

File

pressure effects

hydrostatic pressure

magnetic moments

electronic structure

magnetic properties

2015

Exchange bias phenomenon in (Nd_1-xY_x)_2/3Ca_1/3MnO₃ (x = 0, 0.1) perovskites

Fertman, E. L., Fedorchenko, A. V., Kotlyar, A. V., Desnenko, V. A., Čižmár, E., Baran, A., Khalyavin, D. D., Salak, A. N., Shvartsman, V. V. & Feher, A., 31 Dec 2015, In : Low Temperature Physics. 41, 12, p. 1001-1005 5 p.

Research output: Contribution to journal › Article

Open Access

File

perovskites

coercivity

magnetization

yttrium

magnetic fields

Features of the electron structure of FeTe compounds

Grechnev, G. E., Lyogenkaya, A. A., Panfilov, A. S., Logosha, A. V., Kotlyar, O. V., Gnezdilov, V. P., Makarova, I. P., Chareev, D. A. & Mitrofanova, E. S., 31 Dec 2015, In : Low Temperature Physics. 41, 12, p. 990-995 6 p.

Research output: Contribution to journal › Article

Open Access

File

Fermi surfaces

chemical bonds

electrons

covalent bonds

neutron diffraction

2014

Low-frequency properties of the phonon spectra, and low-temperature thermodynamics of disordered solid solutions

Gospodarev, I. A., Grishayev, V. I., Eremenko, A. V., Klochko, M. S., Kotlyar, A. V., Manzheliy, E. V., Syrkin, E. S. & Feodosyev, S. B., 1 Nov 2014, In : Low Temperature Physics. 40, 11, 1013.

Research output: Contribution to journal › Article

Open Access

File

solid solutions

low frequencies

vibration

thermodynamics

bosons

2013

Impurity levels in the electronic spectra of graphene

Feher, A., Feodosyev, S., Gospodarev, I., Kotlyar, O., Kravchenko, K., Manzhelii, E. & Syrkin, E., 1 Jan 2013, In : Superlattices and Microstructures. 53, 1, p. 55-62 8 p.

Research output: Contribution to journal › Article

Graphite

electronic spectra

Graphene

graphene

Impurities

2008

Local vibrational states in real crystals with impurities near the surface

Feodosyev, S., Gospodarev, I., Kotlyar, O. & Manzhelii, E., 4 Jun 2008, In : Journal of Physics Condensed Matter. 20, 22, 224025.

Research output: Contribution to journal › Article

Defect structures

vibrational states

Impurities

impurities

Defects

Local vibrations in real crystals with combined defects

Gospodarev, I. A., Kotlyar, A. V., Manzhelii, E. V. & Fedosyev, S. B., 13 Mar 2008, In : Low Temperature Physics. 34, 2, p. 152-160 9 p.

Research output: Contribution to journal › Article

Open Access

File

vibration

defects

crystals

impurities

approximation

Loffe-Regel' crossover and boson peaks in disordered solid solutions and similar anomalies in heterogeneous crystalline structures

Gospodarev, I. A., Grishaev, V. I., Kotlyar, A. V., Kravchenko, K. V., Manzheliǐ, E. V., Syrkin, E. S. & Feodos'Ev, S. B., 9 Oct 2008, In : Low Temperature Physics. 34, 8, p. 655-664 10 p.

Research output: Contribution to journal › Article

Open Access

File

crossovers

solid solutions

bosons

anomalies

excitation

2007

Evolution of discrete local levels into an impurity band in solidified inert gas solution

Kosevich, A. M., Feodosyev, S. B., Gospodarev, I. A., Grishaev, V. I., Kotlyar, O. V., Kruglov, V. O., Manzhelii, E. V. & Syrkin, E. S., 3 Aug 2007, In : Low Temperature Physics. 33, 6, p. 559-563 5 p.

Research output: Contribution to journal › Article

Open Access

File

solidified gases

rare gases

impurities

matrix methods

atoms

Specific features of the transformation of local levels into an impurity band of Ag _1-p Al _p disordered solid solutions

Kosevich, A. M., Gospodarev, I. A., Grishaev, V. I., Kotlyar, A. V., Kruglov, V. O., Manzheliĭ, E. V., Syrkin, E. S. & Feodosyev, S. B., 1 Jul 2007, In : Journal of Experimental and Theoretical Physics. 105, 1, p. 4-11 8 p.

Research output: Contribution to journal › Article

solid solutions

aluminum

Jacobi matrix method

impurities

atoms

To the theory of rare gas alloys: Heat capacity

Bagatskii, M. I., Feodosyev, S. B., Gospodarev, I. A., Kotlyar, O. V., Manzhelii, E. V., Nedzvetskiy, A. V. & Syrkin, E. S., 3 Aug 2007, In : Low Temperature Physics. 33, 6, p. 564-568 5 p.

Research output: Contribution to journal › Article

Open Access

File

rare gases

specific heat

impurities

low frequencies

temperature dependence

2006

Local vibrational modes in crystal lattices with a simply connected region of the quasi-continuous phonon spectrum

Kotlyar, A. V. & Feodosyev, S. B., 7 Jul 2006, In : Low Temperature Physics. 32, 3, p. 256-269 14 p.

Research output: Contribution to journal › Article

Open Access

File

crystal lattices

vibration mode

Jacobi matrix method

impurities

Green's functions