Magnetotransport and thermoelectric power of La2/3Ba1/3Mn1-xSbxO3 (x=0-0.05) manganite perovskites

Vikram Sen, Neeraj Panwar, Ashok Rao, C. K. Hsu, Y. K. Kuo, S. K. Agarwal

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The effect of Sb+5-doping on the magnetotransport and thermoelectric power of La2/3Ba1/3Mn1-xSbxO3 (x=0-0.05) perovskite manganites is reported here. Two insulator-metal (I-M) transitions have been observed in the electrical resistivity-temperature ρ (T) behavior of the undoped sample La2/3Ba1/3MnO3. Both the transitions (at TP 1 and TP 2) shift to lower temperatures with doping but to a different extent. TP 1 decreases faster while TP 2 remains almost invariant up to 3% of doping and then decreases. With increasing Sb+5 content, the intrinsic magnetoresistance (MR at TP 1) gets suppressed whereas the extrinsic magnetoresistance at lower temperatures gets enhanced. The thermoelectric behavior S (T) of the pristine sample shows a peak at TP 1 while for the doped samples the peak gets suppressed. All the samples exhibit a crossover in their S (T) behavior from positive to negative at a temperature T*, indicating that the dominant carrier in these compounds changes from hole to electron above T*. Transport behavior above TP 1 (the paramagnetic insulating region) is explained on the basis of the small polaron hopping model while the electron-magnon scattering process has been invoked to explain the thermoelectric power and electrical resistivity behavior in the ferromagnetic regime.

Original languageEnglish
Pages (from-to)86-90
Number of pages5
JournalSolid State Communications
Volume145
Issue number1-2
DOIs
Publication statusPublished - 01-01-2008

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Galvanomagnetic effects
Thermoelectric power
perovskites
Doping (additives)
Magnetoresistance
electrical resistivity
Manganites
Temperature
Metal insulator transition
Electron scattering
Gene Conversion
Perovskite
crossovers
electron scattering
transition metals
manganite
thymostimulin
Electrons
insulators
temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Sen, Vikram ; Panwar, Neeraj ; Rao, Ashok ; Hsu, C. K. ; Kuo, Y. K. ; Agarwal, S. K. / Magnetotransport and thermoelectric power of La2/3Ba1/3Mn1-xSbxO3 (x=0-0.05) manganite perovskites. In: Solid State Communications. 2008 ; Vol. 145, No. 1-2. pp. 86-90.
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abstract = "The effect of Sb+5-doping on the magnetotransport and thermoelectric power of La2/3Ba1/3Mn1-xSbxO3 (x=0-0.05) perovskite manganites is reported here. Two insulator-metal (I-M) transitions have been observed in the electrical resistivity-temperature ρ (T) behavior of the undoped sample La2/3Ba1/3MnO3. Both the transitions (at TP 1 and TP 2) shift to lower temperatures with doping but to a different extent. TP 1 decreases faster while TP 2 remains almost invariant up to 3{\%} of doping and then decreases. With increasing Sb+5 content, the intrinsic magnetoresistance (MR at TP 1) gets suppressed whereas the extrinsic magnetoresistance at lower temperatures gets enhanced. The thermoelectric behavior S (T) of the pristine sample shows a peak at TP 1 while for the doped samples the peak gets suppressed. All the samples exhibit a crossover in their S (T) behavior from positive to negative at a temperature T*, indicating that the dominant carrier in these compounds changes from hole to electron above T*. Transport behavior above TP 1 (the paramagnetic insulating region) is explained on the basis of the small polaron hopping model while the electron-magnon scattering process has been invoked to explain the thermoelectric power and electrical resistivity behavior in the ferromagnetic regime.",
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Magnetotransport and thermoelectric power of La2/3Ba1/3Mn1-xSbxO3 (x=0-0.05) manganite perovskites. / Sen, Vikram; Panwar, Neeraj; Rao, Ashok; Hsu, C. K.; Kuo, Y. K.; Agarwal, S. K.

In: Solid State Communications, Vol. 145, No. 1-2, 01.01.2008, p. 86-90.

Research output: Contribution to journalArticle

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T1 - Magnetotransport and thermoelectric power of La2/3Ba1/3Mn1-xSbxO3 (x=0-0.05) manganite perovskites

AU - Sen, Vikram

AU - Panwar, Neeraj

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N2 - The effect of Sb+5-doping on the magnetotransport and thermoelectric power of La2/3Ba1/3Mn1-xSbxO3 (x=0-0.05) perovskite manganites is reported here. Two insulator-metal (I-M) transitions have been observed in the electrical resistivity-temperature ρ (T) behavior of the undoped sample La2/3Ba1/3MnO3. Both the transitions (at TP 1 and TP 2) shift to lower temperatures with doping but to a different extent. TP 1 decreases faster while TP 2 remains almost invariant up to 3% of doping and then decreases. With increasing Sb+5 content, the intrinsic magnetoresistance (MR at TP 1) gets suppressed whereas the extrinsic magnetoresistance at lower temperatures gets enhanced. The thermoelectric behavior S (T) of the pristine sample shows a peak at TP 1 while for the doped samples the peak gets suppressed. All the samples exhibit a crossover in their S (T) behavior from positive to negative at a temperature T*, indicating that the dominant carrier in these compounds changes from hole to electron above T*. Transport behavior above TP 1 (the paramagnetic insulating region) is explained on the basis of the small polaron hopping model while the electron-magnon scattering process has been invoked to explain the thermoelectric power and electrical resistivity behavior in the ferromagnetic regime.

AB - The effect of Sb+5-doping on the magnetotransport and thermoelectric power of La2/3Ba1/3Mn1-xSbxO3 (x=0-0.05) perovskite manganites is reported here. Two insulator-metal (I-M) transitions have been observed in the electrical resistivity-temperature ρ (T) behavior of the undoped sample La2/3Ba1/3MnO3. Both the transitions (at TP 1 and TP 2) shift to lower temperatures with doping but to a different extent. TP 1 decreases faster while TP 2 remains almost invariant up to 3% of doping and then decreases. With increasing Sb+5 content, the intrinsic magnetoresistance (MR at TP 1) gets suppressed whereas the extrinsic magnetoresistance at lower temperatures gets enhanced. The thermoelectric behavior S (T) of the pristine sample shows a peak at TP 1 while for the doped samples the peak gets suppressed. All the samples exhibit a crossover in their S (T) behavior from positive to negative at a temperature T*, indicating that the dominant carrier in these compounds changes from hole to electron above T*. Transport behavior above TP 1 (the paramagnetic insulating region) is explained on the basis of the small polaron hopping model while the electron-magnon scattering process has been invoked to explain the thermoelectric power and electrical resistivity behavior in the ferromagnetic regime.

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