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Hyperfine Interactions

, Volume 163, Issue 1–4, pp 129–141 | Cite as

High-Pressure Mössbauer Measurements on Nanocrystalline Perovskite (La,Sr)(Mn,Fe)O3

  • Usha Chandra
  • Prerana Mudgal
  • Manoj Kumar
  • Rajeev Rawat
  • G. Parthasarathy
  • Nita Dilawar
  • A. K. Bandyopadhyay
Article

Abstract

We report here the Mössbauer measurements on nanocrystalline perovskite structured manganite La0.8Sr0.2Mn0.8Fe0.19 57Fe0.01O3 as a function of pressure up to 10 GPa at room temperature. The nanocrystalline sample, prepared by sol–gel technique found to have crystallite sizes of ∼138 ± 10 Å. Zero-field electrical resistivity measurements with temperature support the nanocrystalline nature. At ambient pressure, Fe3+ as well as Fe4+ ions are distributed in two different environments – Fe3+ in low symmetric site surrounded by Mn3+ ions only while Fe4+ in high symmetric site with at least one Mn3+ ion. Pressure seems to affect the higher symmetric site. A sudden increase in isomer shift at 0.52 GPa indicates the first order phase transition representing the transformation of Fe4+ to Fe3+. Another transition at 3.7 GPa, represents the presence of Fe3+ in single kind of environment. Pressure dependence of electrical resistivity measurements verifies the transitions attributing the first order transition to the cross over of localized-electron to band magnetism.

Key Words

high-pressure electrical resistivity high-pressure Mössbauer spectroscopy manganite nanocrystalline perovskite 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Usha Chandra
    • 1
  • Prerana Mudgal
    • 1
  • Manoj Kumar
    • 1
  • Rajeev Rawat
    • 2
  • G. Parthasarathy
    • 3
  • Nita Dilawar
    • 4
  • A. K. Bandyopadhyay
    • 4
  1. 1.Department of PhysicsUniversity of RajasthanJaipurIndia
  2. 2.UGC/DAE Consortium for Scientific ResearchIndoreIndia
  3. 3.National Geophysical Research InstituteHyderabadIndia
  4. 4.National Physical LaboratoryNew DelhiIndia

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