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Lower Critical Field Studies of Melt-Textured and Melt-Grown YBa2Cu3O7-x

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Advances in Superconductivity VI

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Abstract

Lower critical field (LCF) measurements have been performed on two samples of melt grown YBCO prepared under different conditions. Measurements using the ΔM approach were made as a function of temperature both with the field parallel to the c-axis (H‖) as well as perpendicular to it (H⊥). Relatively large samples (2-4 mm x 7-9 mm) were used, with regular geometries. The demagnetization question was addressed. 4.2 K LCFs of 920 Oe in the H‖orientation (sample A) and 340 Oe in the H⊥ orientation (sample B) were obtained. LCF temperature dependences were either concave upwards (Sample A) or concave downwards (H⊥ ∝ 1-(T/Tc)2, Sample B), a difference that may be related to the presence or absence, respectively, of optical twinning.

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Author information

Authors and Affiliations

  1. Battelle Memorial Institute, Columbus, OH, 43201, USA

    M. D. Sumption & E. W. Collings

  2. University of Houston, Houston, TX, 77004, USA

    K. Salama

  3. Boeing Defense & Space Group, Seattle, WA, 98124, USA

    T. S. Luhman & M. Strasik

Authors
  1. M. D. Sumption
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  2. K. Salama
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  3. T. S. Luhman
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  4. M. Strasik
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  5. E. W. Collings
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Editor information

Editors and Affiliations

  1. Faculty of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, 724, Japan

    Toshizo Fujita

  2. Superconductivity Research Laboratory, ISTEC, Koto-ku, Tokyo, 135, Japan

    Yuh Shiohara

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© 1994 Springer-Verlag Tokyo

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Sumption, M.D., Salama, K., Luhman, T.S., Strasik, M., Collings, E.W. (1994). Lower Critical Field Studies of Melt-Textured and Melt-Grown YBa2Cu3O7-x . In: Fujita, T., Shiohara, Y. (eds) Advances in Superconductivity VI. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68266-0_131

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  • DOI: https://doi.org/10.1007/978-4-431-68266-0_131

  • Publisher Name: Springer, Tokyo

  • Print ISBN: 978-4-431-68268-4

  • Online ISBN: 978-4-431-68266-0

  • eBook Packages: Springer Book Archive

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