Reply to the comment by N.E. Sluchanko, V.V. Glushkov, and S.V. Demishev
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ONIC PROPERTIES OF SOLID
Reply to the Comment by N.E. Sluchanko, V.V. Glushkov, and S.V. Demishev Yu. S. Ponosova,b*, S. V. Streltsova,b, A. V. Levchenkoc, and V. B. Filipovc a Mikheev
Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620990 Russia b Ural Federal University named after B.N. Yeltsin, ul. Mira 19, Yekaterinburg, 620002 Russia c Frantsevich Institute of Material Science Problems, National Academy of Sciences of Ukraine, ul. Krzhyzhanovskogo 3, Kiev, 03680 Ukraine *e-mail: [email protected] Received September 6, 2016
DOI: 10.1134/S106377611701006X
1. The authors of the comment have noted “substantial differences in the results obtained” in the article [1] being commented on and in publication [2], “which lead to different interpretations of the observed effects proposed by the authors of these publications.” This is not true to the fact. This follows from the figure in which the Raman spectra of Lu11B12, obtained by us at different temperatures, are superimposed on the spectra from Fig. 5 in [2]. It can be seen that our spectra and those obtained in [2] at T = 11 and 300 K almost coincide. In the high-temperature spectra shown in Fig. 5 from [2], as well as in our spectra, a broad peak in the region 300–400 cm–1, which is shifted towards higher frequencies upon further heating, can clearly be observed. It is known that the appearance of the boson peak in disordered systems is associated with excess contribution of vibrational excitations in the range of the acoustic phonons [3]. As shown in [2], the intensity of this peak increases linearly from zero at zero frequency for all temperatures, and the frequency corresponding to it is shifted towards higher frequencies upon further heating [1]. It is known that a boson peak appears in disordered systems due to the excessive contribution of vibrational excitations precisely in the range of acoustic phonons [3]. Since the boundary of the spectrum of acoustic phonons in LuB12 does not exceed 16 meV (~130 cm–1) [4, 5], the temperature evolution of the peak under investigation unambiguously indicates the nonvibrational nature of the observed excitations. The detailed temperature dependences presented in [2] and in the comment indeed indicate weak changes in the spectra at low temperature (as in our measurements); however, the increase in the frequency corresponding to the peak and its broadening can clearly be seen. Obvi-
ously, the results reported in [2] do not allow the observed scattering to be identified as the boson peak. 2. Now, about our “methodological errors.” Indeed, in some cases, the high power of laser radiation may lead to a significant increase in the temperature in the region of the narrow focal spot. This situation was described in detail in a recent publication [6], where it was shown that the increase in the temperature in the heated region of the crystal depends on the absorbed power, the focal region diameter, and the thermal conductivity of the material. The estimates
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