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Low-field Magnetoresistance, Specific Heat and Magnetocaloric Effect in Sr Substituted Pr0.7Ca0.3MnO3

  • Anjana Dogra
  • Sudhindra Rayaprol
  • Shovit Bhattacharya
  • Matthias Eul
  • Wilfried Hermes
  • Rainer Pöttgen
Original Paper

Abstract

We investigate the effect of ionic size variation on the electrical and thermodynamic properties in a series of Pr0.7Ca0.3−x Sr x MnO3 (PCSMO) samples. The increase in Sr content results in an increase of the unit cell volume, as a bigger Sr2+ ion replaces the smaller Ca2+ ions. Resistivity measurements show that the increase in the Sr content also results in the induction of a metal–insulator transition (T MI), which increases with increasing Sr content. The activation energy (E a), calculated from the resistivity data, decreases with increasing Sr content confirming the metallic character. The effect of the magnetic field on resistivity and specific heat has also been studied.

Keywords

Manganites Magnetoresistance Specific heat Magnetization 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Anjana Dogra
    • 1
    • 2
  • Sudhindra Rayaprol
    • 3
  • Shovit Bhattacharya
    • 1
  • Matthias Eul
    • 4
  • Wilfried Hermes
    • 4
  • Rainer Pöttgen
    • 4
  1. 1.Technical Physics DivisionBhabha Atomic Research CentreMumbaiIndia
  2. 2.National Physical LaboratoryNew DelhiIndia
  3. 3.UGC DAE Consortium for Scientific ResearchMumbaiIndia
  4. 4.Institut für Anorganische und Analytische ChemieUniversität MünsterMünsterGermany

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