Journal of Electroceramics

, Volume 21, Issue 1–4, pp 344–348 | Cite as

Transport and magnetic properties of Sr doped Nd0.55Ca0.45MnO3

  • K. F. Wang
  • Y. Wang
  • Sh. Dong
  • X. Y. Yao
  • J. -M. Liu
Article
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Abstract

The effect of Sr doping on the transport and magnetism properties of charge/orbital-ordered Nd0.55Ca0.45MnO3 is investigated. A low temperature phase transition from a charge/orbital ordered insulator to a ferromagnetic metal was founded in the Nd0.55(Ca1−x Sr x )0.45MnO3 samples. The ground state is the charge/orbital ordered insulator at x < 0.2, while for x > 0.3 it changes to a ferromagnetic metal. The resistivities of the samples exhibit almost ideal percolation behavior with a percolation threshold of 0.3. Therefore, this system shows an intricate competition between metallic ferromagnetism and charge/orbital ordered insulator and the percolation behavior demonstrates that the relative volumes of ferromagnetic phase and charge/orbital phases changes with the doping content x and temperature.

Keywords

Colossal magnetoresistance effect Phase separation Percolation behavior 

PACS number

75.47.Lx 75.47.Gk 71.30.+h 
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Notes

Acknowledgement

The authors acknowledge the financial support of this work from the National Key Project for Basic Researches of China, the National Natural Science Foundation of China through the innovative group project and normal project, and LSSMS of Nanjing University.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • K. F. Wang
    • 1
    • 2
  • Y. Wang
    • 1
    • 2
  • Sh. Dong
    • 1
    • 2
  • X. Y. Yao
    • 1
    • 2
  • J. -M. Liu
    • 1
    • 2
  1. 1.Laboratory of Solid State MicrostructuresNanjing UniversityNanjingChina
  2. 2.International Center for Materials PhysicsChinese Academy of SciencesShenyangChina

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