Preparation and characterization of homogeneous YBCO single crystals with doping level near the SC-AFM boundary

R. Liang, D. A. Bonn, W. N. Hardy, J. C. Wynn, K. A. Moler, L. Lu, S. Larochelle, L. Zhou, M. Greven, L. Lurio, S. G.J. Mochrie

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31 Scopus citations

Abstract

High-purity and homogeneous YBa2Cu3Oy single crystals with carrier doping level near the AFM-SC boundary have been obtained in the oxygen content range between y = 6.340 and 6.370. The crystals are ortho-II phase at room temperature and undergo the orthorhombic to tetragonal transition at about 140 °C. They show sharp superconducting transitions, with Tc between 4 and 20 K. Tc changes by 0.8 K when the oxygen content y is changed by 0.001, and is also sensitive to annealing conditions near room temperature, due to the dependence of doping on oxygen ordering correlation lengths. Crystals with oxygen content y lower than 6.345 are non-superconducting.

Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume383
Issue number1-2
DOIs
StatePublished - Dec 1 2002

Bibliographical note

Funding Information:
The Stanford University X-ray group was supported by US Department of Energy under contract nos. DE-FG03-99ER45773 and DE-AC03-76SF00515, and by NSF CAREER Award no. DMR-9985067. Beamline 8-ID at the Advanced Photon Source is supported by the US Department of Energy via Grant DE-FG02-96ER45593.

Keywords

  • Low doping
  • Ortho-II phase
  • Preparation
  • SC-AFM boundary
  • YBCO

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