Zobrazeno 1 - 10
of 716
pro vyhledávání: '"Kempa, M"'
Autor:
Bastien, G., Repček, D., Eliáš, A., Kancko, A., Courtade, Q., Haidamak, T., Savinov, M., Bovtun, V., Kempa, M., Carva, K., Vališka, M., Doležal, P., Kratochvílová, M., Barnett, S. A., Proschek, P., Prokleška, J., Kadlec, C., Kužel, P., Colman, R. H., Kamba, S.
Publikováno v:
Adv. Mater. 2024, 2410282
The study of magnetic frustration in classical spin systems was motivated by the prediction and discovery of classical spin liquid states. These uncommon magnetic phases are characterized by a massive degeneracy of their ground state implying a finit
Externí odkaz:
http://arxiv.org/abs/2405.19859
Microwave (MW) transmission, absorption, and reflection loss spectra of the ferrimagnetic U-type hexaferrite Sr$_4$CoZnFe$_{36}$O$_{60}$ ceramics were studied from 100 MHz to 35 GHz at temperatures between 10 and 390 K. 9 MW magnetic excitations with
Externí odkaz:
http://arxiv.org/abs/2401.04678
Two Displacive Ferroelectric Phase Transitions in Multiferroic Quadruple Perovskite $BiMn_{7}O_{12}$
Autor:
Maia, A., Kempa, M., Bovtun, V., Vilarinho, R., Kadlec, C., Moreira, J. Agostinho, Belik, A. A., Proschek, P., Kamba, S.
We report on the microwave, terahertz (THz), infrared and Raman spectroscopic studies of $BiMn_{7}O_{12}$ ceramics, shedding more light into the nature of two structural phase transitions and their possible relation with ferroelectricity in this comp
Externí odkaz:
http://arxiv.org/abs/2401.02808
Publikováno v:
Journal of Applied Physics; 8/21/2024, Vol. 136 Issue 7, p1-14, 14p
Autor:
Bovtun, V., Kempa, M., Repček, D., Savinov, M., Buršík, J., Heczko, O., Drahokoupil, J., Kamba, S.
Publikováno v:
In Journal of Magnetism and Magnetic Materials 1 January 2024 589
Publikováno v:
Phys. Rev. B 96, 174113-1/13 (2017)
From the new infrared (IR) reflectivity and time-domain terahertz (THz) spectra combined with available high-frequency dielectric data above the MHz range in a broad temperature range of 10-900 K, a full picture of the soft and central mode behavior
Externí odkaz:
http://arxiv.org/abs/1712.06493
Autor:
Kamba, S., Simon, E., Skoromets, V., Bovtun, V., Kempa, M., Pokorny, J., Savinov, M., Koruza, J., Malic, B.
Publikováno v:
Phase Transitions 89, 785-793 (2016)
Dielectric properties of BTZ-BCT ceramics were probed in the frequency range from 10 Hz to 100 THz in a broad temperature range (10-900 K). Polar soft phonon observed in infrared spectra softens with cooling, however below 500 K its frequency becomes
Externí odkaz:
http://arxiv.org/abs/1607.05914
Publikováno v:
Psychology Research and Behavior Management, Vol Volume 14, Pp 137-148 (2021)
Remigiusz Szczepanowski,1,2 Ewelina Cichoń,2,3 Tomasz Niemiec,2,3 Beata E Andrzejewska,2,3 Monika Wójta-Kempa1 1Department of Public Health, Faculty of Health Sciences, Wroclaw Medical University, Wroclaw, Poland; 2Department of Psychology, Faculty
Externí odkaz:
https://doaj.org/article/e828264cccc94bf5b1d42a476c6f3399
Akademický článek
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Autor:
Kamba, S., Goian, V., Skoromets, V., Hejtmanek, J., Bovtun, V., Kempa, M., Borodavka, F., Vanek, P., Belik, A. A., Lee, J. H., Pacherova, O., Rabe, K. M.
Publikováno v:
Phys. Rev. B 89, 064308 (2014)
Infrared reflectivity spectra of cubic SrMnO$_{3}$ ceramics reveal 18 % stiffening of the lowest-frequency phonon below the antiferromagnetic phase transition occurring at T$_{N}$ = 233 K. Such a large temperature change of the polar phonon frequency
Externí odkaz:
http://arxiv.org/abs/1402.2165