Confirmation of complex non-collinear Fe(II) spin ordering in the iron oxychalcogenide La2O2Fe2OSe2 by broad range 139La-NQR
Abstract
The transition metal oxychalcogenide La2O2Fe2OSe2 exhibits a non-collinear spin-ice like antiferromagnetic ordering below $T_N \approx $ 90 K due to complex magnetic exchange interactions and axial single-ion anisotropy of Fe2+ spins. The magnetic structure was deduced/determined from combined 57Fe Mössbauer spectroscopy and 139La-NMR on polycrystalline specimen. In this work, we present zero-field 139La-NQR investigations on polycrystalline La2O2Fe2OSe2 in a broad frequency and temperature range between 2.8 - 20 MHz and 4.2 - 100 K. The measured resonances at νQ, 2 νQ, and 3 νQ are fully consistent with the previous NMR studies and also with the magnetic structure. A substantial modification of the electric field gradient at the La-position below TN is inconsistent with the current investigations.
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BibTeX
@misc{weinhold2026confirmation,
title = {{Confirmation of complex non-collinear Fe(II) spin ordering in the iron oxychalcogenide La$_2$O$_2$Fe$_2$OSe$_2$ by broad range $^139$La-NQR}},
author = {Tillmann Weinhold and Jerin Abraham George and Cornelius Herrmann and Domenic Nowak and Rajib Sarkar and Felix Seewald and Rowena Wachtel and Sabine Wurmehl and Bernd Büchner and Hans-Henning Klauss},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29635},
eprint = {2610.29635},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29635},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Confirmation of complex non-collinear Fe(II) spin ordering in the iron oxychalcogenide La_2O_2Fe_2OSe_2 by broad range ^139La-NQR
AU - Tillmann Weinhold
AU - Jerin Abraham George
AU - Cornelius Herrmann
AU - Domenic Nowak
AU - Rajib Sarkar
AU - Felix Seewald
AU - Rowena Wachtel
AU - Sabine Wurmehl
AU - Bernd Büchner
AU - Hans-Henning Klauss
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29635
UR - https://arxiv.org/abs/2610.29635
AB - The transition metal oxychalcogenide La_2O_2Fe_2OSe_2 exhibits a non-collinear spin-ice like antiferromagnetic ordering below $T_N \approx $ 90 K due to complex magnetic exchange interactions and axial single-ion anisotropy of Fe^2+ spins. The magnetic structure was deduced/determined from combined ^57Fe Mössbauer spectroscopy and ^139La-NMR on polycrystalline specimen. In this work, we present zero-field ^139La-NQR investigations on polycrystalline La_2O_2Fe_2OSe_2 in a broad frequency and temperature range between 2.8 - 20 MHz and 4.2 - 100 K. The measured resonances at ν_Q, 2 ν_Q, and 3 ν_Q are fully consistent with the previous NMR studies and also with the magnetic structure. A substantial modification of the electric field gradient at the La-position below T_N is inconsistent with the current investigations.
ER -