Thermal properties of La2/3Ba1/3(Mn1-xSbx)O3 manganites

Vikram Sen, G. L. Bhalla, Neeraj Panwar, W. K. Syu, N. Kaurav, Y. K. Kuo, Ashok Rao, S. K. Agarwal

Research output: Contribution to journalArticle

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Abstract

Effects of Sb doping on thermal properties like thermoelectric power (S), thermal conductivity (κ), and specific heat (Cp) of La2/3Ba1/3(Mn1-xSbx)O3 (x=0.00-0.05) perovskite manganites are reported. It has been found that S is positive at low temperature and becomes negative at higher temperatures. A pronounced peak was observed in S at the insulator-metal transition for the pristine sample La2/3Ba1/3MnO3, which gets suppressed with Sb-doping. In addition, electron to hole-like crossover temperature seen in the S(T) is also found to move towards lower temperatures with increasing Sb content. The anomalous behavior in thermal conductivity (κ) at the transition is ascribed to the local anharmonic distortions associated with small polarons. The observed reduction of the total κ(T) due to Sb-doping is discussed with various thermal scattering mechanisms. From the specific heat results, broadening of observed sharp peak in the pristine LBMO data on substitution of Sb at Mn site was recognized as the enhancement of magnetic inhomogeneity in these manganites.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalPhysica B: Condensed Matter
Volume405
Issue number1
DOIs
Publication statusPublished - 01-01-2010

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Manganites
Thermodynamic properties
thermodynamic properties
Doping (additives)
thermal conductivity
specific heat
Specific heat
Thermal conductivity
polarons
Polarons
Temperature
Metal insulator transition
Thermoelectric power
crossovers
inhomogeneity
transition metals
insulators
Perovskite
substitutes
Substitution reactions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Sen, V., Bhalla, G. L., Panwar, N., Syu, W. K., Kaurav, N., Kuo, Y. K., ... Agarwal, S. K. (2010). Thermal properties of La2/3Ba1/3(Mn1-xSbx)O3 manganites. Physica B: Condensed Matter, 405(1), 1-4. https://doi.org/10.1016/j.physb.2009.04.033
Sen, Vikram ; Bhalla, G. L. ; Panwar, Neeraj ; Syu, W. K. ; Kaurav, N. ; Kuo, Y. K. ; Rao, Ashok ; Agarwal, S. K. / Thermal properties of La2/3Ba1/3(Mn1-xSbx)O3 manganites. In: Physica B: Condensed Matter. 2010 ; Vol. 405, No. 1. pp. 1-4.
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Sen, V, Bhalla, GL, Panwar, N, Syu, WK, Kaurav, N, Kuo, YK, Rao, A & Agarwal, SK 2010, 'Thermal properties of La2/3Ba1/3(Mn1-xSbx)O3 manganites', Physica B: Condensed Matter, vol. 405, no. 1, pp. 1-4. https://doi.org/10.1016/j.physb.2009.04.033

Thermal properties of La2/3Ba1/3(Mn1-xSbx)O3 manganites. / Sen, Vikram; Bhalla, G. L.; Panwar, Neeraj; Syu, W. K.; Kaurav, N.; Kuo, Y. K.; Rao, Ashok; Agarwal, S. K.

In: Physica B: Condensed Matter, Vol. 405, No. 1, 01.01.2010, p. 1-4.

Research output: Contribution to journalArticle

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AU - Bhalla, G. L.

AU - Panwar, Neeraj

AU - Syu, W. K.

AU - Kaurav, N.

AU - Kuo, Y. K.

AU - Rao, Ashok

AU - Agarwal, S. K.

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N2 - Effects of Sb doping on thermal properties like thermoelectric power (S), thermal conductivity (κ), and specific heat (Cp) of La2/3Ba1/3(Mn1-xSbx)O3 (x=0.00-0.05) perovskite manganites are reported. It has been found that S is positive at low temperature and becomes negative at higher temperatures. A pronounced peak was observed in S at the insulator-metal transition for the pristine sample La2/3Ba1/3MnO3, which gets suppressed with Sb-doping. In addition, electron to hole-like crossover temperature seen in the S(T) is also found to move towards lower temperatures with increasing Sb content. The anomalous behavior in thermal conductivity (κ) at the transition is ascribed to the local anharmonic distortions associated with small polarons. The observed reduction of the total κ(T) due to Sb-doping is discussed with various thermal scattering mechanisms. From the specific heat results, broadening of observed sharp peak in the pristine LBMO data on substitution of Sb at Mn site was recognized as the enhancement of magnetic inhomogeneity in these manganites.

AB - Effects of Sb doping on thermal properties like thermoelectric power (S), thermal conductivity (κ), and specific heat (Cp) of La2/3Ba1/3(Mn1-xSbx)O3 (x=0.00-0.05) perovskite manganites are reported. It has been found that S is positive at low temperature and becomes negative at higher temperatures. A pronounced peak was observed in S at the insulator-metal transition for the pristine sample La2/3Ba1/3MnO3, which gets suppressed with Sb-doping. In addition, electron to hole-like crossover temperature seen in the S(T) is also found to move towards lower temperatures with increasing Sb content. The anomalous behavior in thermal conductivity (κ) at the transition is ascribed to the local anharmonic distortions associated with small polarons. The observed reduction of the total κ(T) due to Sb-doping is discussed with various thermal scattering mechanisms. From the specific heat results, broadening of observed sharp peak in the pristine LBMO data on substitution of Sb at Mn site was recognized as the enhancement of magnetic inhomogeneity in these manganites.

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Sen V, Bhalla GL, Panwar N, Syu WK, Kaurav N, Kuo YK et al. Thermal properties of La2/3Ba1/3(Mn1-xSbx)O3 manganites. Physica B: Condensed Matter. 2010 Jan 1;405(1):1-4. https://doi.org/10.1016/j.physb.2009.04.033