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Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...
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Dynamic evanescent phonon coupling across the La(1-x)Sr(x)MnO3/SrTiO3 interface.

Y Segal1, K F Garrity, C A F Vaz

  • 1Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8284, USA.

Physical Review Letters
|October 11, 2011
PubMed
Summary
This summary is machine-generated.

The transport and magnetic properties of ultrathin La0.53Sr0.47MnO3 films exhibit a sharp cusp due to cross-interface coupling with SrTiO3 substrate

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

Published on: April 12, 2019

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Thin Film Physics

Background:

  • Correlated oxide ultrathin films exhibit unique electronic and magnetic properties.
  • Epitaxial growth on substrates like Strontium Titanate (SrTiO3) can induce novel phenomena.
  • Understanding interfacial effects is crucial for advanced electronic devices.

Purpose of the Study:

  • To investigate the transport and magnetic properties of La0.53Sr0.47MnO3 ultrathin films.
  • To elucidate the origin of the sharp cusp observed at the substrate's structural transition temperature.
  • To explore the role of cross-interface coupling and substrate phonon modes.

Main Methods:

  • Epitaxial growth of La0.53Sr0.47MnO3 films on SrTiO3 substrates.
  • Experimental characterization of transport and magnetic properties.
  • First-principles theoretical calculations.

Main Results:

  • A sharp cusp in transport and magnetic properties was observed at the SrTiO3 structural transition temperature.
  • This cusp arises from evanescent cross-interface coupling between film charge carriers and SrTiO3 soft phonon modes.
  • Linked oxygen octahedral motions mediate this coupling, launching phonons into the film's initial atomic layers.

Conclusions:

  • The study reveals a novel mechanism for interfacial coupling in oxide heterostructures.
  • Phonon-mediated coupling significantly affects the electronic state of ultrathin films.
  • This finding has implications for designing next-generation oxide electronic devices.