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

Research output: Contribution to journalArticle

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Abstract

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
Volume19
Issue number5
DOIs
Publication statusPublished - 07-02-2007

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Superconducting materials
Thermal expansion
thermal expansion
Doping (additives)
extensometers
Dilatometers
Compressibility
pressure dependence
Superconducting transition temperature
compressibility
discontinuity
transition temperature
Oxygen
temperature
high resolution
oxygen
coefficients
Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Rao, Ashok ; Radheshyam, S. ; Kumar, Rajesh ; Gupta, Sandeep ; Meingast, C. ; Gahtori, Bhasker ; Agarwal, S. K. ; Sivakumar, K. M. ; Kuo, Y. K. / The influence of Mn doping on the thermal expansion of the high T C superconductor YBa2(Cu1-xMnx) 3Oy. In: Journal of Physics Condensed Matter. 2007 ; Vol. 19, No. 5.
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abstract = "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.",
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Rao, A, Radheshyam, S, Kumar, R, Gupta, S, Meingast, C, Gahtori, B, Agarwal, SK, Sivakumar, KM & Kuo, YK 2007, 'The influence of Mn doping on the thermal expansion of the high T C superconductor YBa2(Cu1-xMnx) 3Oy', Journal of Physics Condensed Matter, vol. 19, no. 5, 056208. https://doi.org/10.1088/0953-8984/19/5/056208

The influence of Mn doping on the thermal expansion of the high T C superconductor YBa2(Cu1-xMnx) 3Oy. / Rao, Ashok; Radheshyam, S.; Kumar, Rajesh; Gupta, Sandeep; Meingast, C.; Gahtori, Bhasker; Agarwal, S. K.; Sivakumar, K. M.; Kuo, Y. K.

In: Journal of Physics Condensed Matter, Vol. 19, No. 5, 056208, 07.02.2007.

Research output: Contribution to journalArticle

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AU - Rao, Ashok

AU - Radheshyam, S.

AU - Kumar, Rajesh

AU - Gupta, Sandeep

AU - Meingast, C.

AU - Gahtori, Bhasker

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AU - Sivakumar, K. M.

AU - Kuo, Y. K.

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