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Fabrication of Spatially Confined Complex Oxides
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Electronically soft phases in manganites.

G C Milward1, M J Calderón, P B Littlewood

  • 1Cavendish Laboratory, Cambridge University, Madingley Road, Cambridge CB3 0HE, UK. gcm24@cam.ac.uk

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|February 11, 2005
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Summary
This summary is machine-generated.

Colossal magnetoresistance in manganites arises from competing phases. New research shows magnetic and charge modulation can coexist in novel thermodynamic phases, challenging previous models.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Colossal magnetoresistance (CMR) in manganites is typically attributed to phase separation between metallic ferromagnetic and insulating charge-modulated states.
  • Complex phases exhibiting coexistence of magnetic and charge modulation order parameters have been observed in manganite phase diagrams.

Purpose of the Study:

  • To explain the coexistence of magnetic and charge modulation in manganites using a phenomenological Ginzburg-Landau theory.
  • To propose a reinterpretation of charge modulation as an extended 'charge-density wave' phenomenon.

Main Methods:

  • Development and application of a phenomenological Ginzburg-Landau theory.
  • Analysis of phase diagrams and order parameter coexistence.

Main Results:

  • The Ginzburg-Landau theory successfully explains the coexistence of magnetic and charge modulation in new thermodynamic phases.
  • The model predicts a rich diagram of equilibrium phases, consistent with experimental observations.
  • The findings suggest charge modulation in manganites is better described as a charge-density wave.

Conclusions:

  • The coexistence of magnetic and charge modulation in manganites arises from new thermodynamic equilibrium phases, not solely from disorder or strain.
  • This work necessitates a reevaluation of charge modulation in these materials towards a charge-density wave model.
  • The principles of symmetry-driven coexistence of competing orders may be applicable to other correlated electronic systems.