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Fluctuation-induced excess conductivity in the compounds CaREBaCu3O7−y (RE=La and Sm)

  • International Conference On Superconductivity—II
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Abstract

The compounds CaREBaCu3O7−y (RE=La and Sm) are tetragonal at room temperature withT c between 60 and 70 K. The single-phase compounds were prepared by solid-state reaction. The resistivity was measured by a four-probe technique in a continuous flow cryostat with the temperature being controlled to an accuracy of 10 mK. The resistivity vs temperature showed a break in slope around 180 K in CaLaBaCu3O7−y and around 220 K in CaSmBaCu3O7−y . The results were analysed for fluctuation conductivity from 180 K downwards. A plot of dρ/dT vsT showed a sharp peak atT m =69·69 K for La compound and 66·00 K for the Sm compound. Detailed analysis of the resistivity in the regionT on to 180 K was carried out using the procedure due to Veira and Vidal. The results are discussed in this paper.

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References

  • de Leeuw D M, Mutsaers C A H A, Van Hal H A M, Verweij H, Carim A H and Smoorenberg H C A 1988Physica C156 126

    Google Scholar 

  • Hagen S J, Wang Z Z and Ong N P 1988Phys. Rev. B38 7137

    Google Scholar 

  • Kim D H, Goldman A M, Kang J H, Gray K E and Kampwirth R T 1989Phys. Rev. 39 12275

    Article  CAS  Google Scholar 

  • Krishnan H 1990 (unpublished)

  • Lawrence W E and Doniach S 1971Proc. XII Int. Conf. Low Temp. Phys. Kyoto (ed.) K Eizo (Tokyo: Keigaku) p. 361

    Google Scholar 

  • Montgomery H C 1971J. Appl. Phys. 42 2971

    Article  CAS  Google Scholar 

  • Peng J L, Klavins P, Shelton R N, Radousky H B, Hahn P A and Bernardez L Constantino 1989Phys. Rev. B39 9074

    Google Scholar 

  • Srinivasan R 1990Proc. Int. Conf. High Temp. Superconductivity, Bangalore, India, (and references therein)

  • Varadaraju U V, Venkateswara Rao C R, Subba Rao G V, Krishnan H, Srinivasan R, Tomy C V and Malik S K 1990Proc. Int. Conf. High Temp. Superconductivity, Bangalore, India

  • Veira J A and Vidal F 1989Physica C159 468

    Google Scholar 

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Authors and Affiliations

  1. Materials Science Research Centre, Department of Physics, Indian Institute of Technology, 600 036, Madras, India

    H Krishnan, R Srinivasan, V Sankaranarayanan, C K Subramaniam & G V Subba Rao

Authors
  1. H Krishnan
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  2. R Srinivasan
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  3. V Sankaranarayanan
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  4. C K Subramaniam
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  5. G V Subba Rao
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Krishnan, H., Srinivasan, R., Sankaranarayanan, V. et al. Fluctuation-induced excess conductivity in the compounds CaREBaCu3O7−y (RE=La and Sm). Bull. Mater. Sci. 14, 747–752 (1991). https://doi.org/10.1007/BF02744719

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  • DOI: https://doi.org/10.1007/BF02744719

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