Thermal transport in (Y,Gd)Ba2(Cu1-xMn x)3O7-δ for x≤0.02

Bhasker Gahtori, Ratan Lal, S. K. Agarwal, M. A.H. Ahsan, Ashok Rao, Y. F. Lin, K. M. Sivakumar, Y. K. Kuo

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Abstract

Thermal conductivity κ(T) and thermoelectric power S(T) studies on (Y,Gd)Ba2(Cu1-xMnx)3O 7-δ (x≤0.02) superconductors are presented here. Thermal conductivity for all the samples exhibits a hump below the superconducting transition temperature Tc. The peak height of the hump decreases with the Mn content in both the Y-and Gd-based systems, barring GdBa 2(Cu0.99Mn0.01)3O 7-δ. The peak height reduction in the Gd-based cuprates is much faster (∼onefourth) compared to the Y-based samples. The thermoelectric power (TEP) of the Y-based samples for x≤0.0075 is electron-like (up to ∼140K) whereas it turns to hole-like even at x ≤ 0.005 for the Gd-based system. On the basis of the structure of the thermal conductivity hump, and of the electron-or hole-like nature of the thermopower, it has been argued that, in the Y-based system up to x ≤ 0.0075, Mn produces qualitatively the same effect as Gd in the Gd-based system. An analysis of the thermal conductivity data in terms of lattice theory, and the TEP data in terms of a narrow-band picture, has been made to invoke the role of Mn in these systems. Boundary scattering, point defects and sheet-like faults (from κ(T) data analysis) and chemical potential (from S(T) data analysis) support different roles of Mn for x≤0.0075 and x>0.0075.

Original languageEnglish
Article number256212
JournalJournal of Physics Condensed Matter
Volume19
Issue number25
DOIs
Publication statusPublished - 27-06-2007

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Thermoelectric power
Thermal conductivity
thermal conductivity
Lattice theory
Electrons
Chemical potential
Point defects
point defects
cuprates
Superconducting materials
Superconducting transition temperature
narrowband
electrons
transition temperature
Scattering
Hot Temperature
scattering

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Gahtori, B., Lal, R., Agarwal, S. K., Ahsan, M. A. H., Rao, A., Lin, Y. F., ... Kuo, Y. K. (2007). Thermal transport in (Y,Gd)Ba2(Cu1-xMn x)3O7-δ for x≤0.02. Journal of Physics Condensed Matter, 19(25), [256212]. https://doi.org/10.1088/0953-8984/19/25/256212
Gahtori, Bhasker ; Lal, Ratan ; Agarwal, S. K. ; Ahsan, M. A.H. ; Rao, Ashok ; Lin, Y. F. ; Sivakumar, K. M. ; Kuo, Y. K. / Thermal transport in (Y,Gd)Ba2(Cu1-xMn x)3O7-δ for x≤0.02. In: Journal of Physics Condensed Matter. 2007 ; Vol. 19, No. 25.
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abstract = "Thermal conductivity κ(T) and thermoelectric power S(T) studies on (Y,Gd)Ba2(Cu1-xMnx)3O 7-δ (x≤0.02) superconductors are presented here. Thermal conductivity for all the samples exhibits a hump below the superconducting transition temperature Tc. The peak height of the hump decreases with the Mn content in both the Y-and Gd-based systems, barring GdBa 2(Cu0.99Mn0.01)3O 7-δ. The peak height reduction in the Gd-based cuprates is much faster (∼onefourth) compared to the Y-based samples. The thermoelectric power (TEP) of the Y-based samples for x≤0.0075 is electron-like (up to ∼140K) whereas it turns to hole-like even at x ≤ 0.005 for the Gd-based system. On the basis of the structure of the thermal conductivity hump, and of the electron-or hole-like nature of the thermopower, it has been argued that, in the Y-based system up to x ≤ 0.0075, Mn produces qualitatively the same effect as Gd in the Gd-based system. An analysis of the thermal conductivity data in terms of lattice theory, and the TEP data in terms of a narrow-band picture, has been made to invoke the role of Mn in these systems. Boundary scattering, point defects and sheet-like faults (from κ(T) data analysis) and chemical potential (from S(T) data analysis) support different roles of Mn for x≤0.0075 and x>0.0075.",
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Gahtori, B, Lal, R, Agarwal, SK, Ahsan, MAH, Rao, A, Lin, YF, Sivakumar, KM & Kuo, YK 2007, 'Thermal transport in (Y,Gd)Ba2(Cu1-xMn x)3O7-δ for x≤0.02', Journal of Physics Condensed Matter, vol. 19, no. 25, 256212. https://doi.org/10.1088/0953-8984/19/25/256212

Thermal transport in (Y,Gd)Ba2(Cu1-xMn x)3O7-δ for x≤0.02. / Gahtori, Bhasker; Lal, Ratan; Agarwal, S. K.; Ahsan, M. A.H.; Rao, Ashok; Lin, Y. F.; Sivakumar, K. M.; Kuo, Y. K.

In: Journal of Physics Condensed Matter, Vol. 19, No. 25, 256212, 27.06.2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Thermal transport in (Y,Gd)Ba2(Cu1-xMn x)3O7-δ for x≤0.02

AU - Gahtori, Bhasker

AU - Lal, Ratan

AU - Agarwal, S. K.

AU - Ahsan, M. A.H.

AU - Rao, Ashok

AU - Lin, Y. F.

AU - Sivakumar, K. M.

AU - Kuo, Y. K.

PY - 2007/6/27

Y1 - 2007/6/27

N2 - Thermal conductivity κ(T) and thermoelectric power S(T) studies on (Y,Gd)Ba2(Cu1-xMnx)3O 7-δ (x≤0.02) superconductors are presented here. Thermal conductivity for all the samples exhibits a hump below the superconducting transition temperature Tc. The peak height of the hump decreases with the Mn content in both the Y-and Gd-based systems, barring GdBa 2(Cu0.99Mn0.01)3O 7-δ. The peak height reduction in the Gd-based cuprates is much faster (∼onefourth) compared to the Y-based samples. The thermoelectric power (TEP) of the Y-based samples for x≤0.0075 is electron-like (up to ∼140K) whereas it turns to hole-like even at x ≤ 0.005 for the Gd-based system. On the basis of the structure of the thermal conductivity hump, and of the electron-or hole-like nature of the thermopower, it has been argued that, in the Y-based system up to x ≤ 0.0075, Mn produces qualitatively the same effect as Gd in the Gd-based system. An analysis of the thermal conductivity data in terms of lattice theory, and the TEP data in terms of a narrow-band picture, has been made to invoke the role of Mn in these systems. Boundary scattering, point defects and sheet-like faults (from κ(T) data analysis) and chemical potential (from S(T) data analysis) support different roles of Mn for x≤0.0075 and x>0.0075.

AB - Thermal conductivity κ(T) and thermoelectric power S(T) studies on (Y,Gd)Ba2(Cu1-xMnx)3O 7-δ (x≤0.02) superconductors are presented here. Thermal conductivity for all the samples exhibits a hump below the superconducting transition temperature Tc. The peak height of the hump decreases with the Mn content in both the Y-and Gd-based systems, barring GdBa 2(Cu0.99Mn0.01)3O 7-δ. The peak height reduction in the Gd-based cuprates is much faster (∼onefourth) compared to the Y-based samples. The thermoelectric power (TEP) of the Y-based samples for x≤0.0075 is electron-like (up to ∼140K) whereas it turns to hole-like even at x ≤ 0.005 for the Gd-based system. On the basis of the structure of the thermal conductivity hump, and of the electron-or hole-like nature of the thermopower, it has been argued that, in the Y-based system up to x ≤ 0.0075, Mn produces qualitatively the same effect as Gd in the Gd-based system. An analysis of the thermal conductivity data in terms of lattice theory, and the TEP data in terms of a narrow-band picture, has been made to invoke the role of Mn in these systems. Boundary scattering, point defects and sheet-like faults (from κ(T) data analysis) and chemical potential (from S(T) data analysis) support different roles of Mn for x≤0.0075 and x>0.0075.

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