The influence of Mn doping on the thermal expansion of the high T C superconductor YBa2(Cu1-xMnx) 3Oy

Ashok Rao, S. Radheshyam, Rajesh Kumar, Sandeep Gupta, C. Meingast, Bhasker Gahtori, S. K. Agarwal, K. M. Sivakumar, Y. K. Kuo

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Measurement of the linear thermal expansion α has been carried out for Mn substituted YBa2(Cu1-xMnx) 3Oy (0≤x≤2%) using a high resolution dilatometer over the temperature range 10-300 K. Across the superconducting transition, the jump in the coefficient of linear thermal expansion Δα was found to decrease with increasing Mn content. For the pure sample, we observed a negative jump. While a threefold decrease in Δα with x ≤ 0.5% was observed, only slight changes in the oxygen content and transition temperature have been noted, as a function of the Mn concentration. The above observations clearly suggest that the substituent Mn is being incorporated into the superconductors as a whole and not in the form of a local cluster. Further, from the Ehrenfest relations, the pressure dependence of TC (dT C/dP) and the discontinuity in the compressibility, ΔK, are expected to decrease with the Mn concentration.

Original languageEnglish
Article number056208
JournalJournal of Physics Condensed Matter
Issue number5
Publication statusPublished - 07-02-2007

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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