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Paramagnetic Resonance Studies of Phase Separation in Cuprate Superconductors

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Phase Separation in Cuprate Superconductors

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Summary

Using paramagnetic resonance techniques phenomena are identified in La2CuO4+δ ceramics which support the phase separation model. A signal near B = 0, proportional to the superconducting volume fraction, decreases after heating to T i ≥ 270 K and fast quenching to 4.2 K and a new signal, related to Cu2+, appears. The initial intensities are approached under annealing at T an ≥ 200 K. In single crystal La2CuO4+δ the Cu2+ related signal is not observed. La2−x Sr x CuO4+δ ceramic does not show any of the indicated responses. The effects can be attributed to evaporation of spin polarized clusters from a percolating network of metallic - and below T c superconducting - paths under heating and subsequent quenching and condensation into such paths under annealing. The origin of the Cu2+ related signal is discussed.

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Author information

Authors and Affiliations

  1. University of Osnabrück, D-49069, Osnabrück, Germany

    O. F. Schirmer, G. Wübbeler & Th. Wahlbrink

Authors
  1. O. F. Schirmer
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  2. G. Wübbeler
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  3. Th. Wahlbrink
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Editor information

Editors and Affiliations

  1. Technische Universität Cottbus, Postfach 101344, D-03013, Cottbus, Germany

    Ernst Sigmund

  2. IBM Research Division, Zürich Research Laboratory, Säumerstrasse 4, CH-8803, Rüschlikon, Switzerland

    K. Alex Müller

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© 1994 Springer-Verlag Berlin Heidelberg

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Schirmer, O.F., Wübbeler, G., Wahlbrink, T. (1994). Paramagnetic Resonance Studies of Phase Separation in Cuprate Superconductors. In: Sigmund, E., Müller, K.A. (eds) Phase Separation in Cuprate Superconductors. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-78805-5_10

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  • DOI: https://doi.org/10.1007/978-3-642-78805-5_10

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-78807-9

  • Online ISBN: 978-3-642-78805-5

  • eBook Packages: Springer Book Archive

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