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Related Experiment Video

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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7&#8722;&#948;/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

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Charge-ordered ferromagnetic phase in La(0.5)Ca(0.5)MnO3.

James C Loudon1, Neil D Mathur, Paul A Midgley

  • 1Department of Materials Science and Metallurgy, University of Cambridge, UK. james.loudon@physics.org

Nature
|December 20, 2002
PubMed
Summary
This summary is machine-generated.

Mixed-valent manganites exhibit complex phase transitions. This study reveals ferromagnetic and charge-ordered regions coexist in La(0.5)Ca(0.5)MnO(3), challenging previous understandings of these materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Mixed-valent manganites display intricate magnetic, electronic, and structural phase transitions.
  • The La(1-x)Ca(x)MnO(3) phase diagram shows distinct ferromagnetic/metallic and antiferromagnetic/charge-ordered states depending on calcium concentration (x).
  • Coexistence of dissimilar ground states, including charge order and disorder, is hypothesized for La(0.5)Ca(0.5)MnO(3) around x = 0.5.

Purpose of the Study:

  • To investigate the spatial distribution of coexisting magnetic and charge phases in La(0.5)Ca(0.5)MnO(3).
  • To uncover any unexpected phases or phase behaviors within this material system.
  • To provide detailed electron microscopy data clarifying the nature of phase coexistence.

Main Methods:

  • Electron holography and Fresnel imaging to probe local magnetization.
  • Electron diffraction and dark-field imaging to identify charge ordering.
  • Microscopy techniques applied to La(0.5)Ca(0.5)MnO(3) samples.

Main Results:

  • Micrometre-sized ferromagnetic regions were observed alongside non-magnetized regions.
  • Ferromagnetic regions exhibit a local magnetization of approximately 3.4 Bohr magnetons per Mn atom.
  • Charge order was found in non-magnetized regions and, surprisingly, also within ferromagnetic regions.

Conclusions:

  • La(0.5)Ca(0.5)MnO(3) exhibits a complex phase coexistence at the nanoscale.
  • Charge order is not mutually exclusive with ferromagnetism in this material.
  • The findings challenge existing models of phase separation in mixed-valent manganites.