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PreprintCC BY 4.0arXiv

Positive Temperature Coefficient of Anisotropy due to d6L Groundstate in ε-Fe2O3

  • Rachel Nickel
  • Kurt Kummer
  • Johan van Lierop
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Abstract

Positive anisotropy temperature coefficients (dK/dT>0) usually arise from hybridization between magnetic 3d states and strongly spin-orbit-coupled (SOC) subsystems. Yet ε-Fe2O3 shows dK/dT>0 (125-200~K) without an obvious SOC partner. We study pure and Cr-doped (with weakened Fe-O hybridization) ε-Fe2O3 across the transition from low temperature incommensurate to high-anisotropy magnetic phases. We identify a d6L groundstate in ε-Fe2O3 while reduced hybridization yields d6 + d6L2 in the Cr-doped system, highlighting metal-ligand hybridization as a route to tune magnetic, electronic and orbitronic properties.

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Cite

BibTeXRIS
BibTeX
@misc{nickel2026positive,
  title = {{Positive Temperature Coefficient of Anisotropy due to $d^6L$ Groundstate in $ε$-Fe$_2$O$_3$}},
  author = {Rachel Nickel and Kurt Kummer and Johan van Lierop},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.08927},
  eprint = {2609.08927},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.08927},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Positive Temperature Coefficient of Anisotropy due to d^6L Groundstate in ε-Fe_2O_3
AU  - Rachel Nickel
AU  - Kurt Kummer
AU  - Johan van Lierop
PY  - 2026
DA  - 2026/09/08
PB  - arXiv
DO  - 10.48550/arxiv.2609.08927
UR  - https://arxiv.org/abs/2609.08927
AB  - Positive anisotropy temperature coefficients (dK/dT>0) usually arise from hybridization between magnetic 3d states and strongly spin-orbit-coupled (SOC) subsystems. Yet ε-Fe_2O_3 shows dK/dT>0 (125-200~K) without an obvious SOC partner. We study pure and Cr-doped (with weakened Fe-O hybridization) ε-Fe_2O_3 across the transition from low temperature incommensurate to high-anisotropy magnetic phases. We identify a d^6L groundstate in ε-Fe_2O_3 while reduced hybridization yields d^6 + d^6L^2 in the Cr-doped system, highlighting metal-ligand hybridization as a route to tune magnetic, electronic and orbitronic properties.
ER  -