Effect of Ni doping on the thermal expansion of the high-Tc superconductor YBa2Cu3Oy

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Thermal expansion measurements have been carried out for the Ni-substituted compounds YBa2(Cu1-xNix)3Oy, (0 ≤ x ≤ 5%) with a high-resolution dilatometer using the three-terminal capacitance technique. The present set-up is sensitive enough to detect changes in α of less than 10-8 K-1. Results indicate that the jump Δα in the coefficient of linear thermal expansion decreases with increase in Ni content. For x = 1.5%, Δα decreases by a factor of 3 whereas Tc does not change appreciably. There is evidence that the temperature dependence of a for compounds with high Ni concentration depends on the conditions of sample growth.

Original languageEnglish
Pages (from-to)527-533
Number of pages7
JournalJournal of Physics Condensed Matter
Issue number5
Publication statusPublished - 29-01-1996

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics


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