Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki
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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2015, Volume 102, Issue 5, Pages 327–332
DOI: https://doi.org/10.7868/S0370274X15170087 (Mi jetpl4721) 		 
This article is cited in 11 scientific papers (total in 11 papers)

CONDENSED MATTER

Phonons in YB$_6$ and LaB$_6$: Effects of temperature and pressure

Yu. S. Ponosova, N. Yu. Shitsevalovab

a Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620090, Russia
b Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, vul. Krzhizhanovs’koho 3, Kyiv, 03680, Ukraine
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DOI: https://doi.org/10.7868/S0370274X15170087
Abstract: Raman scattering by phonons in YB$_6$ and LaB$_6$ has been studied in wide temperature ($8$–$800$ K) and pressure (up to $10$ GPa) ranges. Acoustic phonons in both hexaborides exhibit anomalous softening with a decrease in the temperature. The positive isothermal Grüneisen coefficient of these modes in YB$_6$ appears to be an order of magnitude lower than the absolute value of the negative isobaric coefficient, which indicates the dominating role of temperature effects. The temperature shifts of the vibration frequencies of the B sublattice in YB$_6$ caused by phonon interactions have the opposite sign and exceed the respective shifts in LaB$_6$.
Received: 15.07.2015
English version:
Journal of Experimental and Theoretical Physics Letters, 2015, Volume 102, Issue 5, Pages 295–300
DOI: https://doi.org/10.1134/S0021364015170105
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: Yu. S. Ponosov, N. Yu. Shitsevalova, “Phonons in YB$_6$ and LaB$_6$: Effects of temperature and pressure”, Pis'ma v Zh. Èksper. Teoret. Fiz., 102:5 (2015), 327–332; JETP Letters, 102:5 (2015), 295–300
Citation in format AMSBIB
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    • This publication is cited in the following 11 articles:
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