Journal
APPLIED PHYSICS LETTERS
Volume 81, Issue 21, Pages 4046-4048Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1522828
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The dielectric relaxation in SrTiO3, Sr0.942Ca0.058TiO3, and K0.989Li0.011TaO3 was analyzed. While at higher temperatures the characteristic relaxation frequency follows the Arrhenius behavior, its value is temperature independent at low temperatures. It is shown that such a behavior is a consequence of the dynamic properties of bipolarons, which undergo a transition from thermally activated hopping to a tunneling regime. (C) 2002 American Institute of Physics.
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