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Dc and Ac conductivity of La2CuO4+δ

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Zeitschrift für Physik B Condensed Matter

Abstract

The complex conductivity of La2CuO4+δ has been investigated for frequencies 20 Hz≤ν≤4 GHz and temperatures 1.5K≤T≤450 K. Two single crystals with δ≈0 and δ≈0.02 were investigated, using dc (four-probe), reflectometric and contact-free techniques. At high temperatures the dc conductivity is thermally activated with low values of the activation energy. For low temperatures Mott's variable range hopping dominates. The real and imaginary parts of the ac conductivity follow a power-law dependence σ∼v s, typical for charge transport by hopping processes. A careful analysis of the temperature dependence of the ac conductivity and of the frequency exponents has been performed. It is not possible to explain all aspects of the ac conductivity in La2CuO4+δ by standart hopping models. However, the observed minimum in the temperature dependence of the frequency exponents strongly suggests tunneling of large polarons as dominant transport process.

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Authors and Affiliations

  1. Institut für Festkörperphysik, Technische Hochschule Darmstadt, D-64289, Darmstadt, Germany

    P. Lunkenheimer, G. Knebel, A. Pimenov & A. Loidl

  2. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovska, Russia

    G. A. Emel’chenko

Authors
  1. P. Lunkenheimer
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  2. G. Knebel
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  3. A. Pimenov
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  4. G. A. Emel’chenko
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  5. A. Loidl
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Lunkenheimer, P., Knebel, G., Pimenov, A. et al. Dc and Ac conductivity of La2CuO4+δ . Z. Phys. B - Condensed Matter 99, 507–516 (1995). https://doi.org/10.1007/s002570050069

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  • DOI: https://doi.org/10.1007/s002570050069

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