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Colossal magnetoresistance is a Griffiths singularity.

M B Salamon1, P Lin, S H Chun

  • 1Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801-3080, USA.

Physical Review Letters
|May 15, 2002
PubMed
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The magnetic transition in doped manganites is explained by the Griffiths phase, not just percolation. This new perspective clarifies unusual magnetic and heat capacity data in La0.7Ca0.3MnO3.

Area of Science:

  • Condensed matter physics
  • Materials science
  • Magnetism

Background:

  • Doped manganites exhibit large magnetoresistance, often attributed to percolation effects.
  • Disorder in magnetic materials can lead to complex phenomena, including the Griffiths phase.

Purpose of the Study:

  • To demonstrate that the magnetic transition in doped manganites with large magnetoresistance should be understood within the framework of the Griffiths phase.
  • To explain anomalous magnetic susceptibility and heat capacity data in La0.7Ca0.3MnO3 using the Griffiths phase model.

Main Methods:

  • Theoretical analysis of magnetic transitions in disordered systems.
  • Analysis of experimental data (susceptibility and heat capacity) from a single crystal of La0.7Ca0.3MnO3.

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Main Results:

  • The study shows that the Griffiths phase provides a more comprehensive explanation for the magnetic transition than simple percolation.
  • This approach successfully accounts for unusual features observed in the susceptibility and heat capacity measurements.

Conclusions:

  • The Griffiths phase is a crucial concept for understanding the magnetic transition in doped manganites, especially in the presence of disorder.
  • Viewing the transition through the lens of the Griffiths phase offers a unified explanation for complex experimental observations in materials like La0.7Ca0.3MnO3.