Zobrazeno 1 - 10
of 370
pro vyhledávání: '"Trepakov, V A"'
Autor:
Trepakov, V. A., Dejneka, A. G., Kvyatkovskii, O. E., Khvostova, D., Potucek, Z., Savinov, M. E., Jastrabik, L., Wang, X., Cheong, S. -W.
Spectral ellipsometry studies of the optical functions, first observation of photoluminescence and low frequency dielectric permittivity investigations were performed in ferroelectric - multiferroic TbMnO3 single crystals. The main attention was paid
Externí odkaz:
http://arxiv.org/abs/1604.02428
Autor:
Markovin, P. A., Trepakov, V. A., Guzhva, M. E., Razdobarin, A. G., Tagantsev, A. K., Andreev, D. A., Itoh, M., Dejneka, A.
Short and long range impurity-induced polar ordering in Sr1-xCaxTiO3 with x = 0.014 (SCT-1.4) and SrTi(16O0.0318O0.97)3 (STO-18) single crystals were investigated and discussed on the basis of the light refraction temperature dependences measurements
Externí odkaz:
http://arxiv.org/abs/1503.06681
Autor:
Kovaleva, N. N., Kugel, K. I., Potucek, Z., Goryachev, N. S., Kusmartseva, O. E., Bryknar, Z., Trepakov, V. A., Demikhov, E. I., Dejneka, A., Kusmartsev, F. V., Stoneham, A. M.
In magnetic compounds with Jahn-Teller (JT) ions (such as Mn3+ or Cu2+), the ordering of the electron or hole orbitals is associated with cooperative lattice distortions. There the role of JT effect, although widely recognised, is still elusive in th
Externí odkaz:
http://arxiv.org/abs/1407.1475
Autor:
Kovaleva, N. N., Kusmartseva, O. E., Kugel, K. I., Maksimov, A. A., Nuzhnyy, D., Balbashov, A. M., Demikhov, E. I., Dejneka, A., Trepakov, V. A., Kusmartsev, F. V., Stoneham, A. M.
Publikováno v:
J. Phys.: Condens. Matter 25 (2013) 155602
The multi-order Raman scattering is studied up to a fourth order for a detwinned LaMnO_3 crystal. Based on a comprehensive data analysis of the polarisation-dependent Raman spectra, we show that the anomalous features in the multi-order scattering co
Externí odkaz:
http://arxiv.org/abs/1407.1409
Autor:
Oja, R., Tyunina, M., Yao, L., Pinomaa, T., Kocourek, T., Dejneka, A., Stupakov, O., Jelinek, A., Trepakov, V., van Dijken, S., Nieminen, R. M.
Publikováno v:
Phys. Rev. Lett. 109, 127207 (2012)
We use computational and experimental methods to study d0 ferromagnetism at a charge- imbalanced interface between two perovskites. In SrTiO3/KTaO3 superlattice calculations, the charge imbalance introduces holes in the SrTiO3 layer, inducing a d0 fe
Externí odkaz:
http://arxiv.org/abs/1206.0140
X- and Q-band electron paramagnetic resonance (EPR) study is reported on the SrTiO3 single crystals doped with 0.5-at.% MnO. EPR spectra originating from the S = 2 ground state of Mn3+ ions are shown to belong to the three distinct types of Jahn-Tell
Externí odkaz:
http://arxiv.org/abs/1112.1560
Autor:
Yusupov, R. V., Gracheva, I. N., Rodionov, A. A., Syrnikov, P. P., Gubaev, A. I., Dejneka, A., Jastrabik, L., Trepakov, V. A., Salakhov, M. Kh.
The formation of the photo-polaronic excitons in ABO_{3} perovskite type oxides has been detected experimentally by means of the photoinduced electron paramagnetic resonance studies of KTa_{0.998}Nb_{0.012}O_{3} crystals. The corresponding microwave
Externí odkaz:
http://arxiv.org/abs/1109.5253
Autor:
Dejneka, A., Tyunina, M., Narkilahti, J., Levoska, J., Chvostova, D., Jastrabik, L., Trepakov, V. A.
Effect of biaxial tensile strains on optical functions and band edge transitions of ultra thin epitaxial films was studied using as an example a 13 nm thick SrTiO3 films deposited on KTaO3(100) single-crystal substrates. Optical functions were determ
Externí odkaz:
http://arxiv.org/abs/0911.4391
Dielectric permittivity and infrared reflectivity spectra of Li doped KNbO3 single crystals have been studied for the first time for K1-xLixNbO3 (KLN) with x = 0.015, 0.02, 0.065. It was found that like in KTaO3, Li admixture results in appearance of
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609229
Publikováno v:
in Fundamental Physics of Ferroelectrics 2002, Washington 2002, Editor Ronald E. Cohen, AIP Conference Proceedings 626, Melville, New York, 2002, pp. 169 - 177
New experimental data on solid solutions of quantum paraelectrics with KTaO_3:Nb as an example are considered within a framework of a quantum theory of ferroelectric phase transitions. In order to describe the effect of local heterogeneities a percol
Externí odkaz:
http://arxiv.org/abs/cond-mat/0208317