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July 27, 2026Journal of Applied CrystallographyOpen Access

Tetragonal distortion of the multiferroic compound α-LiFe 5 O 8 from first-principles calculations

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Authors

YCYaoshi ChengSPSo-Hyun Park

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Overview

First-principles calculations reveal a tetragonal ground-state distortion in multiferroic lithium ferrite, indicating competing magnetic superexchange interactions drive lattice symmetry breaking.

Key Points

  • Determine the true ground-state crystal structure and resolve the electronic and magnetic origins of lattice distortion in multiferroic α-LiFe5O8.
  • Performed first-principles density functional theory calculations using the PBEsol+U functional with Standard Solid-State Pseudopotentials (SSSP).
  • Calculated spin-resolved projected density of states (PDOS), Hubbard U contributions, and directional magnetic exchange interactions.
  • Identified the ground state as the tetragonal space group P4_3 2_1 2 rather than the previously reported cubic P4_3 32, with lattice parameters a = 8.3528(2) Å and c = 8.3511(1) Å.
  • Determined a direct band gap of 2.050 eV for the tetragonal ground state, slightly lower than 2.107 eV for the cubic model.
  • Demonstrated collinear ferrimagnetic spin alignment along the c axis in magnetic space group P4_3 2_1' 2', driven by strong Fe–O–Fe superexchange interactions and directional exchange competition.

Cite This Study

Cheng et al. (2026) studied this question.

synapsesocial.com/papers/6a832eae95b373e00c93ce35https://doi.org/10.1107/s1600576726006709
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