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Highly degenerate canted spin structure in bilayer manganite La1.1Sr1.9Mn2O7.

M Kubota1, Y Oohara, H Yoshizawa

  • 1Neutron Scattering Laboratory, I.S.S.P., University of Tokyo, Tokai, Ibaraki, 319-1106, Japan. mkubota@post.kek.jp

Physical Review Letters
|August 9, 2003
PubMed
Summary

Neutron scattering revealed a strong magnetic diffuse signal in bilayer manganite La1.1Sr1.9Mn2O7 at 20 K. This directly evidences a highly degenerate canted spin structure, distinct from higher temperature monolayer or bilayer arrangements.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Bilayer manganites like La1.1Sr1.9Mn2O7 exhibit complex magnetic properties.
  • Understanding spin structures is crucial for their electronic applications.

Purpose of the Study:

  • To investigate the magnetic diffuse signals in La1.1Sr1.9Mn2O7 using neutron scattering.
  • To determine the spin structure at low temperatures.

Main Methods:

  • Neutron scattering experiments were performed on La1.1Sr1.9Mn2O7.
  • Magnetic diffuse signals were analyzed at various temperatures (20 K, 144 K, 288 K).

Main Results:

  • A strong magnetic diffuse signal was observed at 20 K, significantly stronger than at higher temperatures.

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  • The observed signal at 20 K does not correspond to bilayer or monolayer structures.
  • The signal is characteristic of a highly degenerate canted spin structure.

    • Conclusions:

    • The low-temperature neutron scattering data provides direct evidence for a canted spin structure in La1.1Sr1.9Mn2O7.
    • This finding clarifies the magnetic phase of this bilayer manganite at low temperatures.