Structural, electrical and thermal studies of Nb-doped Pr0.7 Sr0.3 Mn1 - x Nbx O3 (0 ≤ x ≤ 0.05) manganites

S. K. Agarwal, Neeraj Kumar, Neeraj Panwar, Bhasker Gahtori, Ashok Rao, P. C. Chang, Y. K. Kuo

Research output: Contribution to journalArticle

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Abstract

X-ray diffraction (XRD), electrical resistivity (ρ) and thermal measurements of thermopower (S), thermal conductivity (κ), and specific heat (CP) of Pr0.7 Sr0.3 Mn1 - x Nbx O3 (0 ≤ x ≤ 0.05) manganite samples are reported here. XRD and electrical resistivity measurements have been carried out up to 5% Nb-doping whereas thermal measurements are limited up to 3% Nb-doping as higher doped sample exhibits a large value of electrical resistivity. With Nb-doping the lattice volume increases, which indicates the occupancy of Mn+4 sites by Nb+5 and eventually results in generating more Mn+ 3 Jahn Teller active (JT) ions. Nb doping also reflects its repercussion in the ρ(T) behavior where the insulator-metal transition temperature of the pristine Pr0.7Sr0.3MnO3 shifts to lower temperatures with increasing doping content. Based on the comparison of electrical resistivity and thermopower data, we establish that the strength of electron-phonon coupling increases with increasing Nb content. Thermal conductivity behavior κ(T) has been viewed in terms of the scattering of phonons by spin fluctuations and such a scenario has been corroborated with the specific heat data.

Original languageEnglish
Pages (from-to)684-688
Number of pages5
JournalSolid State Communications
Volume150
Issue number13-14
DOIs
Publication statusPublished - 01-04-2010

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Manganites
Doping (additives)
electrical resistivity
Thermoelectric power
Specific heat
Thermal conductivity
thermal conductivity
specific heat
Spin fluctuations
X ray diffraction
Phonons
diffraction
Superconducting transition temperature
phonons
x rays
transition temperature
Hot Temperature
insulators
Scattering
Ions

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Agarwal, S. K. ; Kumar, Neeraj ; Panwar, Neeraj ; Gahtori, Bhasker ; Rao, Ashok ; Chang, P. C. ; Kuo, Y. K. / Structural, electrical and thermal studies of Nb-doped Pr0.7 Sr0.3 Mn1 - x Nbx O3 (0 ≤ x ≤ 0.05) manganites. In: Solid State Communications. 2010 ; Vol. 150, No. 13-14. pp. 684-688.
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Structural, electrical and thermal studies of Nb-doped Pr0.7 Sr0.3 Mn1 - x Nbx O3 (0 ≤ x ≤ 0.05) manganites. / Agarwal, S. K.; Kumar, Neeraj; Panwar, Neeraj; Gahtori, Bhasker; Rao, Ashok; Chang, P. C.; Kuo, Y. K.

In: Solid State Communications, Vol. 150, No. 13-14, 01.04.2010, p. 684-688.

Research output: Contribution to journalArticle

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AU - Agarwal, S. K.

AU - Kumar, Neeraj

AU - Panwar, Neeraj

AU - Gahtori, Bhasker

AU - Rao, Ashok

AU - Chang, P. C.

AU - Kuo, Y. K.

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AB - X-ray diffraction (XRD), electrical resistivity (ρ) and thermal measurements of thermopower (S), thermal conductivity (κ), and specific heat (CP) of Pr0.7 Sr0.3 Mn1 - x Nbx O3 (0 ≤ x ≤ 0.05) manganite samples are reported here. XRD and electrical resistivity measurements have been carried out up to 5% Nb-doping whereas thermal measurements are limited up to 3% Nb-doping as higher doped sample exhibits a large value of electrical resistivity. With Nb-doping the lattice volume increases, which indicates the occupancy of Mn+4 sites by Nb+5 and eventually results in generating more Mn+ 3 Jahn Teller active (JT) ions. Nb doping also reflects its repercussion in the ρ(T) behavior where the insulator-metal transition temperature of the pristine Pr0.7Sr0.3MnO3 shifts to lower temperatures with increasing doping content. Based on the comparison of electrical resistivity and thermopower data, we establish that the strength of electron-phonon coupling increases with increasing Nb content. Thermal conductivity behavior κ(T) has been viewed in terms of the scattering of phonons by spin fluctuations and such a scenario has been corroborated with the specific heat data.

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