Non-Arrhenius conductivity in the fast ionic conductor Li_(0.05)La_(0.5)TiO_(3): reconciling spin-lattice and electrical-conductivity relaxations

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París, M. A.
Sanz, J.
Ibarra, J.
Torres, L. M.
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Nuclear magnetic resonance and electrical conductivity measurements are conducted to study the dynamics of the ionic diffusion process in the crystalline ionic conductor Li_(0.05)La_(0.5)TiO_(3). dc conductivity shows a nonArrhenius temperature dependence, similar to the one recently reported for some ionic conducting glasses. Spin-lattice and conductivity relaxations are analyzed in the same frequency and temperature range in terms of the non-Arrhenius dependence of the correlation time. Both relaxations are then described using a single correlation function of the form f(t)=exp(-(t/τ)^(β)), with β=0.4 over the whole temperature range.
© 1997 The American Physical Society.
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1) F. Borsa, D. R. Torgeson, S. W. Martin, H. K. Patel, Phys. Rev. B, 46, 795 (1992). 2) K. L. Ngai, Phys. Rev. B, 48, 13, 481 (1993). 3) R. Kohlrausch, Ann. Phys. (Leipzig), 72, 393 (1847). 4) K. L. Ngai, Comments Solid State Phys., 9, 121 (1979) --- ibid., 9, 141 (1980) --- for a recent review, see, K. L. Ngai, in Effects of Disorder on Relaxational Processes, edited by R. Richert and A. Blumen (Springer-Verlag, Berlin, 1994), p. 89. 5) K. L. Ngai, R. W. Rendell, H. Jain, Phys. Rev. B, 30, 2133 (1984). 6) S. R. Elliott, A. P. Owens, Philos. Mag. B, 60, 777 (1989). 7) S. R. Elliott, A. P. Owens, Phys. Rev. B, 44, 47 (1991). 8) K. Funke, Prog. Solid State Chem., 22, 111 (1993). 9) M. Tatsumisago, C. A. Angell, S. W. Martin, J. Chem. Phys., 97, 6968 (1992). 10) M. Meyer, P. Maass, A. Bunde, Phys. Rev. Lett., 71, 573 (1993). 11) J. Kincs, S. W. Martin, Phys. Rev. Lett., 76, 70 (1996). 12) K. L. Ngai, A. K. Rizos, Phys. Rev. Lett., 76, 1296 (1996). 13) Y. Inaguma, L. Chen, M. Itoh, T. Nakamura, T. Uchida, M. Ikuta, M. Wakihara, Solid State Commun., 86, 689 (1993). 14) Y. Inaguma, L. Chen, M. Itoh, T. Nakamura, Solid State Ion., 70/71, 196 (1994). 15) M. Itoh, Y. Inaguma, W. Jung, L. Chen, T. Nakamura, Solid State Ion., 70/71, 203 (1994). 16) C. León, M. L. Lucía, J. Santamaría, M. A. París, J. Sanz, A. Várez, Phys. Rev. B, 54, 183 (1996). 17) A. Várez, F. García-Alvarado, E. Morán, M. A. Alario Franco, J. Solid State Chem., 118, 78 (1995). 18) E. Fukushima, S. Roeder, Experimental Pulse NMR: A Nuts and Bolts Approach (Addison-Wesley, New York, 1981). 19) C. León, M. L. Lucía, J. Santamaría, Phys. Rev. B, 55, 882 (1997). 20) C. León, M. L. Lucía, J. Santamaría, Philos. Mag. B, 75, 629 (1997). 21) K. Funke, D. Wilmer, Europhys. Lett., 12, 363 (1990). 22) N. Menon, S. R. Nagel, D. C. Venerus, Phys. Rev. Lett., 73, 963 (1994). 23) P. K. Dixon, S. R. Nagel, Phys. Rev. Lett., 61, 341 (1988). 24) R. D. Deegan, S. R. Nagel, Phys. Rev. B, 52, 5653 (1995).