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Phonon and magnetoelastic coupling in Al0.5Ga0.5FeO3: Raman, magnetization and neutron diffraction studies.

K K Mishra1, R Shukla, P S R Krishna

  • 1Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, P.O. Box 70377, San Juan, PR 00936-8377, USA. karuna.kara@upr.edu karunaphy05@gmail.com.

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This study reveals spin-phonon coupling in Al0.5Ga0.5FeO3 (ALGF), a lead-free magnetoelectric material. Researchers observed significant phonon changes at the magnetic transition, indicating strong interactions between spin and lattice vibrations.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Coupling phenomena among spin, phonon, and charge degrees of freedom are crucial for understanding materials with magnetic, ferroelectric, or ferroelastic order.
  • Lead-free magnetoelectric materials are of significant technological interest.
  • Al0.5Ga0.5FeO3 (ALGF) is a promising candidate for exploring these coupling phenomena.

Purpose of the Study:

  • To investigate the structure and phonons of Al0.5Ga0.5FeO3 (ALGF) using variable temperature dependent powder neutron diffraction and Raman spectroscopy.
  • To understand the interplay between magnetic ordering and lattice vibrations in ALGF.
  • To quantify the spin-phonon coupling effect in this material.

Main Methods:

  • Variable temperature dependent powder neutron diffraction to study structural and magnetic properties.
  • Raman spectroscopy to analyze phonon modes.
  • Magnetization studies (field-cooled and zero-field-cooled) to determine magnetic ordering temperature.

Main Results:

  • ALGF exhibits an orthorhombic (Pc21n) structure with no structural transitions between 7-800 K.
  • Ferrimagnetic ordering was observed below 225 K (TN), with an antiferromagnetic arrangement of Fe3+ ions.
  • Significant changes in phonon frequencies were observed at the magnetic transition, deviating from standard anharmonicity models, indicating strong spin-phonon coupling.
  • The libration mode at 270 cm-1 showed the largest coupling constant (λ∼2.3), while stretching vibrations at 695 and 738 cm-1 had lower coupling constants (λ∼0.5).

Conclusions:

  • Spin-phonon coupling is clearly discernible in ALGF, affecting various phonon modes, particularly libration and stretching vibrations.
  • The observed coupling is a key factor influencing the material's properties and technological potential.
  • ALGF serves as an excellent model system for studying spin-phonon interactions in multiferroic materials.