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Pramana

, Volume 30, Issue 5, pp L483–L490 | Cite as

Superconductivity in the 100–120 K region in oxides of the Tl-Ca-Ba-Cu-O system

  • A K Ganguli
  • G N Subbanna
  • A M Umarji
  • S V Bhat
  • C N R Rao
Rapid Communications

Abstract

Oxides with different cation ratios 2122, 2212, 2213 and 2223 in the Ti-Ca-Ba-Cu-O system exhibit onset of superconductivity in the 110–125 K range with zero-resistance in the 95–105 K range. Electron microscopic studies show dislocations, layered morphology and other interesting features. These oxides absorb electromagnetic radiation (9.11 GHz) in the superconducting phase.

Keywords

High-temperature superconductivity Tl2CaBa2Cu2O8+δ Tl-Ca-Ba-Cu-O system 

PACS Nos

74.70 

References

  1. Bhat S V, Ganguly P and Rao C N R 1987aPramana — J. Phys 28 425CrossRefADSGoogle Scholar
  2. Bhat S V, Ganguly P, Ramakrishnan T V and Rao C N R 1987bJ. Phys. C20 L559Google Scholar
  3. Chu C W, Bechtold J, Gao L, Hor P H, Huang Z J, Meng R L, Sun Y Y, Wang Y Q and Xue Y Y 1988Phys. Rev. Lett. (to be published)Google Scholar
  4. Hazen R M, Finger L W, Angel R J, Prewitt C T, Ross N L, Hadidiacos C G, Heaney P J, Veblen D R, Sheng Z Z, Ali A E and Hermann A M 1988Phys. Rev. Lett. (to be published)Google Scholar
  5. Portis A M, Blazey K W, Muller K A and Bednorz J G 1988Europhys. Lett. 5 467CrossRefADSGoogle Scholar
  6. Rao C N R, Umarji A M, Mohan Ram R A, Vijayaraghavan R, Nanjunda Swamy K S, Somasundaram P and Ganapathi L 1988Pramana — J. Phys. 30 L359Google Scholar
  7. Rao C N R and Gopalakrishnan J 1986New directions in solid state chemistry (Cambridge: University Press)Google Scholar
  8. Sheng Z Z and Hermann 1988Nature (London) 332 55, 138CrossRefADSGoogle Scholar
  9. Tarascon J M, LePage Y, Barboux P, Bagley B G, Greene L H, McKinnon W R, Hull G W, Giroud M and Hwang D M 1988 (to be published)Google Scholar

Copyright information

© Indian Academy of Sciences 1988

Authors and Affiliations

  • A K Ganguli
    • 1
  • G N Subbanna
    • 1
    • 2
  • A M Umarji
    • 1
    • 2
  • S V Bhat
    • 1
    • 3
  • C N R Rao
    • 1
  1. 1.Solid State and Structural Chemistry UnitIndian Institute of ScienceBangaloreIndia
  2. 2.Materials Research LaboratoryIndian Institute of ScienceBangaloreIndia
  3. 3.Department of PhysicsIndian Institute of ScienceBangaloreIndia

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