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Orbital Order Melting at Reduced Dimensions.

Yong-Jin Kim1,2, Changhoon Lee3,4,5, Heung-Sik Park1,2

  • 1Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon 34141, Republic of Korea.

Nano Letters
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Summary

Orbital order in LaMnO3 films melts below six unit cells. Reducing dimensionality suppresses orbital ordering, making the Mn d orbital more isotropic and impacting phonon modes.

Keywords:
Critical ThicknessJahn−Teller DistortionLanthanum Manganite Thin FilmsOrbital Order

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • The orbital degree of freedom is crucial in correlated materials, influencing lattice and spin properties.
  • Understanding the stability of long-range orbital order in reduced dimensions is key for designing novel electronic functions.

Purpose of the Study:

  • To investigate the stability of orbital ordering in LaMnO3 as dimensionality is controlled.
  • To determine the critical thickness for the suppression of orbital order in reduced dimensions.

Main Methods:

  • Epitaxial thin film synthesis of LaMnO3 with controlled thickness.
  • Structural and electronic characterization of orbital ordering.
  • First-principles density functional theory calculations.

Main Results:

  • Orbital ordering in LaMnO3 films melts below a critical thickness of approximately six unit cells.
  • Reduced dimensionality transforms 2D orbital ordering planes into quasi-1D nanostrips.
  • Suppression of orbital order is linked to altered phonon modes and increased Mn d orbital isotropy.

Conclusions:

  • Dimensionality plays a critical role in the stability of orbital order in LaMnO3.
  • Bandwidth narrowing and interfacial effects in ultrathin films induce electronic instability, leading to the absence of orbital order.