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PreprintCC BY-NC-ND 4.0arXiv

Phonon evidence for a partial, re-entrant spin reorientation near room temperature in LaFe1−xNixO3

  • Subha Maity
  • Dushyant Singh
  • Vigneshwari S R
  • Tharundev V V
  • Navneet Sharma
  • Subhavenkadesh SS
  • Krista R. Khiangte
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Abstract

Spin reorientation near room temperature offers a route to controlling antiferromagnetic order, yet LaFeO$3$, which lacks a magnetic rare-earth ion, is generally expected to retain its spin orientation along the a axis below TN≈740~K. Here, we investigate LaFe1−xNixO3 (x=0 and 0.1) using temperature-dependent magnetization and Raman spectroscopy over 200--400~K. Both compositions exhibit magnetic anomalies at 285.6 and 323~K, respectively, accompanied by correlated deviations of 12 Raman modes from their conventional anharmonic behavior. Principal component analysis and a global fitting approach reveal a common temperature-dependent phonon response, with mode-dependent amplitudes and signs. To interpret these anomalies, we develop a Landau-based spin-phonon coupling model describing complete, partial re-entrant, and incipient spin reorientation. Comparison with the experimental Raman profiles favors a partial, re-entrant rotation of the N'eel vector in both compositions, centered near 290~K. Ni substitution narrows the characteristic reorientation interval from approximately 116 to 84~K and enhances the magnetization anomaly by a factor of four. An additional feature near 262~K in LaFeO3 is consistent with the Morin transition of trace α-Fe2O3. These findings suggest that partial spin reorientation can emerge without magnetic rare-earth ions and establish collective Raman phonon anomalies as a sensitive indirect probe of magnetic anisotropy changes in orthoferrites.

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Cite

BibTeXRIS
BibTeX
@misc{maity2026phonon,
  title = {{Phonon evidence for a partial, re-entrant spin reorientation near room temperature in LaFe$_1-x$Ni$_x$O$_3$}},
  author = {Subha Maity and Dushyant Singh and Vigneshwari S R and Tharundev V V and Navneet Sharma and Subhavenkadesh SS and Krista R. Khiangte},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.31725},
  eprint = {2610.31725},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.31725},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - UNPB
TI  - Phonon evidence for a partial, re-entrant spin reorientation near room temperature in LaFe_1−xNi_xO_3
AU  - Subha Maity
AU  - Dushyant Singh
AU  - Vigneshwari S R
AU  - Tharundev V V
AU  - Navneet Sharma
AU  - Subhavenkadesh SS
AU  - Krista R. Khiangte
PY  - 2026
DA  - 2026/10/22
PB  - arXiv
DO  - 10.48550/arxiv.2610.31725
UR  - https://arxiv.org/abs/2610.31725
AB  - Spin reorientation near room temperature offers a route to controlling antiferromagnetic order, yet LaFeO$3$, which lacks a magnetic rare-earth ion, is generally expected to retain its spin orientation along the a axis below TN≈740~K. Here, we investigate LaFe_1−xNi_xO_3 (x=0 and 0.1) using temperature-dependent magnetization and Raman spectroscopy over 200--400~K. Both compositions exhibit magnetic anomalies at 285.6 and 323~K, respectively, accompanied by correlated deviations of 12 Raman modes from their conventional anharmonic behavior. Principal component analysis and a global fitting approach reveal a common temperature-dependent phonon response, with mode-dependent amplitudes and signs. To interpret these anomalies, we develop a Landau-based spin-phonon coupling model describing complete, partial re-entrant, and incipient spin reorientation. Comparison with the experimental Raman profiles favors a partial, re-entrant rotation of the N'eel vector in both compositions, centered near 290~K. Ni substitution narrows the characteristic reorientation interval from approximately 116 to 84~K and enhances the magnetization anomaly by a factor of four. An additional feature near 262~K in LaFeO_3 is consistent with the Morin transition of trace α-Fe_2O_3. These findings suggest that partial spin reorientation can emerge without magnetic rare-earth ions and establish collective Raman phonon anomalies as a sensitive indirect probe of magnetic anisotropy changes in orthoferrites.
ER  -