Effect of Nb doping at Mn site on thermal expansion of Pr 0.7Sr0.3MnO3

Ashok Rao, P. Poornesh, K. K. Wu, Y. K. Kuo, S. K. Agarwal

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this study we present results on effect of Nb doping on thermal expansion of Pr0.7Sr0.3MnO3. Thermal expansion measurements were done using three terminal capacitance method. The pure sample shows a jump at the insulator-metal (I-M) transition temperature, and with Nb doping, a fourfold decrease in the jump is found. Since thermal expansion is a bulk property, this suggests that the dopants are not in the form of local clusters; rather they are distributed uniformly throughout the sample. Temperature variation of Gruniesen ratio α/CP shows that for temperatures below I-M transition, the ratio is weakly dependent on temperature. Pressure dependence on the transition temperature, dTP/dP and jump in compressibility, Δβ, of these samples has been estimated using well-known Ehrenfest equations. The present results are in fairly good agreement with those reported in the literature.

Original languageEnglish
Pages (from-to)54-56
Number of pages3
JournalSolid State Communications
Volume172
DOIs
Publication statusPublished - 01-01-2013

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Thermal expansion
thermal expansion
Doping (additives)
Superconducting transition temperature
transition temperature
insulators
Metal insulator transition
Compressibility
Temperature
pressure dependence
compressibility
temperature
Capacitance
capacitance
transition metals
Metals
metals

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "In this study we present results on effect of Nb doping on thermal expansion of Pr0.7Sr0.3MnO3. Thermal expansion measurements were done using three terminal capacitance method. The pure sample shows a jump at the insulator-metal (I-M) transition temperature, and with Nb doping, a fourfold decrease in the jump is found. Since thermal expansion is a bulk property, this suggests that the dopants are not in the form of local clusters; rather they are distributed uniformly throughout the sample. Temperature variation of Gruniesen ratio α/CP shows that for temperatures below I-M transition, the ratio is weakly dependent on temperature. Pressure dependence on the transition temperature, dTP/dP and jump in compressibility, Δβ, of these samples has been estimated using well-known Ehrenfest equations. The present results are in fairly good agreement with those reported in the literature.",
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Effect of Nb doping at Mn site on thermal expansion of Pr 0.7Sr0.3MnO3. / Rao, Ashok; Poornesh, P.; Wu, K. K.; Kuo, Y. K.; Agarwal, S. K.

In: Solid State Communications, Vol. 172, 01.01.2013, p. 54-56.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of Nb doping at Mn site on thermal expansion of Pr 0.7Sr0.3MnO3

AU - Rao, Ashok

AU - Poornesh, P.

AU - Wu, K. K.

AU - Kuo, Y. K.

AU - Agarwal, S. K.

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AB - In this study we present results on effect of Nb doping on thermal expansion of Pr0.7Sr0.3MnO3. Thermal expansion measurements were done using three terminal capacitance method. The pure sample shows a jump at the insulator-metal (I-M) transition temperature, and with Nb doping, a fourfold decrease in the jump is found. Since thermal expansion is a bulk property, this suggests that the dopants are not in the form of local clusters; rather they are distributed uniformly throughout the sample. Temperature variation of Gruniesen ratio α/CP shows that for temperatures below I-M transition, the ratio is weakly dependent on temperature. Pressure dependence on the transition temperature, dTP/dP and jump in compressibility, Δβ, of these samples has been estimated using well-known Ehrenfest equations. The present results are in fairly good agreement with those reported in the literature.

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