Effect of Mn doping on the specific heat of the high TC superconductor REBa2Cu3Oy (RE = Y,Gd)

Ashok Rao, S. Radheshyam, Anirban Das, Bhasker Gahtori, S. K. Agarwal, Y. F. Lin, K. M. Sivakumar, Y. K. Kuo

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Abstract

We present measurements of specific heat in Mn-doped compounds REBa 2(Cu1-xMnx)3Oy (RE ≤ Y and Gd) with 0≤x≤2%. It is found that the transition temperature of Mn-doped YBa2(Cu1-xMnx)3O y (YBaCuMnO) compounds does not change appreciably. On the other hand, in the case of GdBa2(Cu1-xMnx) 3Oy (GdBaCuMnO) samples, the transition temperature decreases noticeably with the increase in Mn concentration. In REBaCuMnO, a jump in specific heat at the superconducting transition was observed for a low concentration of Mn; however, only a small change in slope was noticed for Mn concentrations above 1%. Replacing 0.5% Cu by Mn has only a marginal effect on the transition temperature, but a three-fold suppression of the specific heat jump is observed with such a substitution. This finding clearly demonstrates that these constituents are being incorporated into the superconductors as a whole and not in the form of a local cluster.

Original languageEnglish
Pages (from-to)2955-2962
Number of pages8
JournalJournal of Physics Condensed Matter
Volume18
Issue number11
DOIs
Publication statusPublished - 22-03-2006

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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