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Magnetic Phase Transition in the Quasi-One-Dimensional Spin Chain System Fe0.75Cu0.25NbO4.

Diego da Silva Evaristo1,2, Romualdo Santos Silva3, Raí Figueredo Jucá1

  • 1Departamento de Física, Universidade Federal de Sergipe, São Cristóvão, SE 49100-000, Brasil.

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Summary

Copper substitution in iron niobate creates a room-temperature ferrimagnetic state. This material transitions to antiferromagnetism at 38.4 K, revealing complex magnetic interactions and spin-phonon coupling.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Magnetism

Background:

  • Quasi-one-dimensional spin chain systems exhibit complex magnetic behaviors.
  • Understanding structure-property relationships is crucial for designing novel magnetic materials.

Purpose of the Study:

  • To comprehensively investigate the structural, charge-state, vibrational, and magnetic properties of Fe$_{0.75}$Cu$_{0.25}$NbO$_{4}$.
  • To elucidate the mechanism behind the observed magnetic ordering and transitions.

Main Methods:

  • Multiple experimental techniques including X-ray diffraction, Mössbauer spectroscopy, Raman spectroscopy, and magnetic measurements (M vs T, ΔSM vs T).

Main Results:

  • Copper substitution induces changes in lattice parameters, creates mixed valence states of copper (Cu$^{2+}$ and Cu$^{1+}$), and introduces oxygen vacancies.
  • A ferrimagnetic (FiM) state ordered at room temperature, driven by double-exchange interactions between Fe$^{3+}$ and Cu$^{2+}$ mediated by oxygen.
  • A magnetic transition from ferrimagnetic to antiferromagnetic (FiM to AFM) observed at T = 38.4 K.
  • 57Fe Mössbauer spectroscopy identified two distinct Fe species contributing to both FiM and AFM states.
  • Raman spectroscopy confirmed the magnetic transition and revealed spin-phonon coupling.

Conclusions:

  • Fe$_{0.75}$Cu$_{0.25}$NbO$_{4}$ exhibits a complex magnetic phase diagram with a room-temperature ferrimagnetic state and a low-temperature antiferromagnetic state.
  • The study highlights the role of copper substitution, mixed valence states, and oxygen vacancies in determining magnetic properties.
  • Spin-phonon coupling is identified as a significant factor in the observed magnetic transition.