Abstract
The low-frequency lattice dynamics of lead magnoniobate has been studied using inelastic neutron scattering in the temperature range 650 K < T < 1050 K. The measurements have been performed in two Brillouin zones, (200) and (300). The data corresponding to these two zones and different values of the reduced wave vector have been treated in a common frame. It has been shown that the model assuming one optical phonon mode fails in an adequate description of scattering in both zones. The model involving a two-mode behavior of soft optical phonons provides a good agreement with experimental data. It has been demonstrated that the frequency of the low-energy soft-mode component follows the Curie-Weiss law with the Curie temperature T C = 400 K, which fits well dielectric spectroscopy measurements.
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G. A. Smolenskiĭ and A. I. Agranovskaya, Zh. Tekh. Fiz. 28(7), 1491 (1958) [Sov. Phys. Tech. Phys. 3 (7), 1380 (1958)].
G. A. Smolenskiĭ, A. I. Agranovskaya, S. N. Popov, and V. A. Isupov, Zh. Tekh. Fiz. 28, 2152 (1958) [Sov. Phys. Tech. Phys. 3, 1981 (1958)].
E. V. Colla, E. Y. Koroleva, N. M. Okuneva, and S. B. Vakhrushev, J. Phys. Chem. 4, 3671 (1992).
G. Burns and B. A. Scott, Solid State Commun. 13, 423 (1973).
G. Burns and F. H. Dacol, Solid State Commun. 48, 853 (1983).
D. Viehland, S. J. Lang, L. E. Cross, and M. Wuttig, Phys. Rev. B: Condens. Matter 46, 8003 (1992).
A. Naberezhnov, S. Vakhrushev, B. Dorner, D. Strauch, and H. Moudden, Eur. Phys. J. B 11, 13 (1999).
I. F. Chang and S. S. Mitra, Adv. Phys. 20, 359 (1971).
P. Gehring, S. Park, and G. Shirane, Phys. Rev. Lett. 84, 5216 (2000).
P. Gehring, S. Wakimoto, Z. Ye, and G. Shirane, Phys. Rev. Lett. 87, 277601 (2001).
S. Wakimoto, C. Stock, Z. Ye, W. Chen, P. Gehring, and G. Shirane, Phys. Rev. B: Condens. Matter 66, 224102 (2002).
S. Wakimoto, C. Stock, R. Birgeneau, Z. Ye, W. Chen, W. Buyers, P. Gehring, and G. Shirane, Phys. Rev. B: Condens. Matter 65, 172105 (2002).
K. Hirota, Z. Ye, S. Wakimoto, P. Gehring, and G. Shirane, Phys. Rev. B: Condens. Matter 65, 104105 (2002).
S. Vakhrushev and S. Shapiro, Phys. Rev. B: Condens. Matter 66, 214101 (2002).
J. Hlinka and M. Kempa, Phase Transitions 81, 491 (2008).
M. Matsuura, K. Hirota, P.M. Gehring, W. Chen, Z.G. Ye, and G. Shirane, Physica B (Amsterdam) 385, 123 (2006).
K. Hirota, S. Wakimoto, and D. E. Cox, J. Phys. Soc. Jpn. 75, 111006 (2006).
C. Stock, D. Ellis, I. P. Swainson, G. Xu, H. Hiraka, Z. Zhong, H. Luo, X. Zhao, D. Viehland, R. J. Birgeneau, and G. Shirane, Phys. Rev. B: Condens. Matter 73, 064107 (2006).
C. Stock, H. Luo, D. Viehland, J. Li, I. Swainson, R. Birgeneau, and G. Shirane, J. Phys. Soc. Jpn. 74, 3002 (2005).
N. Gvasaliya, B. Roessli, R. Cowley, P. Huber, and S. Lushnikov, J. Phys.: Condens. Matter 17, 4343 (2005).
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Original Russian Text © S.B. Vakhrushev, R.G. Burkovsky, S. Shapiro, A. Ivanov, 2010, published in Fizika Tverdogo Tela, 2010, Vol. 52, No. 5, pp. 838–841.
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Vakhrushev, S.B., Burkovsky, R.G., Shapiro, S. et al. Two-mode behavior of the PbMg1/3Nb2/3O3 relaxor. Phys. Solid State 52, 889–893 (2010). https://doi.org/10.1134/S106378341005001X
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DOI: https://doi.org/10.1134/S106378341005001X