Abstract
The dependence of the character of the phase transition that accompanies the polaron band collapse in Ag x TiTe2 on the concentration of polaron centers determining the density of states of the polaron band was studied by differential thermal analysis and by measuring the magnetic susceptibility. In the low-concentration limit, the transition is found to be smooth. As the concentration of impurity centers increases, the transition changes to the first order. On the temperature-concentration diagram, the line along which the change in the phase transition order occurs is determined by percolation laws. It is shown that the thermal effect accompanying the transition can be related to the decrease in the electron free energy due to polaron localization.
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References
A. N. Titov and A. V. Dolgoshein, Fiz. Tverd. Tela (St. Petersburg) 42(3), 426 (2000) [Phys. Solid State 42 (3), 434 (2000)].
Yu. A. Firsov, Polarons (Nauka, Moscow, 1975) [in Russian].
N. F. Mott and E. A. Davis, Electron Processes in Non-Crystalline Materials (Clarendon, Oxford, 1979).
A. S. Alexandrov and N. Mott, Polarons and Bipolarons (World Sci., Singapore, 1995).
A. N. Titov, A. N. Skomorokhov, A. A. Titov, S. G. Titova, and V. A. Semenov, Fiz. Tverd. Tela (St. Petersburg) 49(8), 1460 (2007) [Phys. Solid State 49 (8), 1532 (2007)].
A. N. Titov, Yu. M. Yarmoshenko, M. Neumann, V. G. Pleshchev, and S. G. Titova, Fiz. Tverd. Tela (St. Petersburg) 46(9), 1628 (2004) [Phys. Solid State 46 (9), 1681 (2004)].
Y. Arnaud, M. Chevreton, A. Ahouanjiou, M. Danot, and J. Rouxel, J. Solid State Chem. 17, 9 (1976).
X. Y. Cui, H. Negishi, S. G. Titova, K. Shimada, A. Ohniski, M. Higashiguchi, Y. Miura, S. Hino, A. M. Jahir, A. Titov, H. Bidadi, S. Negishi, H. Namatame, M. Taniguchi, and M. Sasaki, Phys. Rev. B: Condens. Matter 73, 085 111 (2006).
A. N. Titov and S. G. Titova, J. Alloys Compd. 256, 13 (1997).
A. N. Titov, Fiz. Tverd. Tela (St. Petersburg) 38(10), 3126 (1996) [Phys. Solid State 38 (10), 1709 (1996)].
D. K. G. de Boer, C. F. van Bruggen, G. W. Bus, R. Coehoorn, C. Haas, and G. A. Sawatsky, Phys. Rev. B: Condens. Matter 29, 6797 (1984).
N. V. Baranov, K. Inoue, V. I. Maksimov, A. S. Ovchinnikov, V. G. Pleschov, A. Podlesnyak, A. N. Titov, and N. V. Toporova, J. Phys.: Condens. Matter 16, 9243 (2004).
V. G. Pleshchev, N. V. Toporova, A. N. Titov, and N. V. Baranov, Fiz. Tverd. Tela (St. Petersburg) 46(7), 1153 (2004) [Phys. Solid State 46 (7), 1183 (2004)].
A. N. Titov, Neorg. Mater. 33(5), 534 (1997) [Inorg. Mater. 33 (5), 447 (1997)].
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Original Russian Text © A.N. Titov, 2008, published in Fizika Tverdogo Tela, 2008, Vol. 50, No. 5, pp. 905–908.