Altermagnetism in Folded Iron Chain Systems
Abstract
Altermagnetism, a moment-compensated magnetism with momentum-dependent spin splitting, has so far been realized primarily in Néel-type antiferromagnets. Here, we demonstrate altermagnetism in folded iron-chain systems with block-type magnetic order (e.g., ↑ ↑ ↓ ↓). In the strictly one-dimensional (1D) case, altermagnetism is forbidden by the [C2||cal T] symmetry, but it can emerge when such chains are stacked into a quasi-1D array. To generate altermagnetic spin splitting via this chain-stacking mechanism, two essential ingredients are required: a block-type spin order that spontaneously breaks the combined parity-time reversal symmetry, and finite inter-chain hopping. Using first-principles calculations, we identify the K3Fe2Se4 family as a promising platform that realizes this mechanism, hosting a d-wave altermagnet even without lattice C4 symmetry. Moreover, owing to its lower symmetry, the block-type folded chain exhibits an isotropic altermagnetic spin splitting, which may manifest as an altermagnetic wrapping effect. Our findings unify real-space block magnetism and reciprocal-space altermagnetism, establishing folded iron chains as a tunable platform for zero-moment spintronic applications.
Versions
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BibTeX
@misc{lin2026altermagnetism,
title = {{Altermagnetism in Folded Iron Chain Systems}},
author = {Ling-Fang Lin and Yang Zhang and Satoshi Okamoto and Adriana Moreo and Lun-Hui Hu and Elbio Dagotto},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.31732},
eprint = {2610.31732},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.31732},
}
RIS
TY - UNPB
TI - Altermagnetism in Folded Iron Chain Systems
AU - Ling-Fang Lin
AU - Yang Zhang
AU - Satoshi Okamoto
AU - Adriana Moreo
AU - Lun-Hui Hu
AU - Elbio Dagotto
PY - 2026
DA - 2026/10/22
PB - arXiv
DO - 10.48550/arxiv.2610.31732
UR - https://arxiv.org/abs/2610.31732
AB - Altermagnetism, a moment-compensated magnetism with momentum-dependent spin splitting, has so far been realized primarily in Néel-type antiferromagnets. Here, we demonstrate altermagnetism in folded iron-chain systems with block-type magnetic order (e.g., ↑ ↑ ↓ ↓). In the strictly one-dimensional (1D) case, altermagnetism is forbidden by the [C_2||cal T] symmetry, but it can emerge when such chains are stacked into a quasi-1D array. To generate altermagnetic spin splitting via this chain-stacking mechanism, two essential ingredients are required: a block-type spin order that spontaneously breaks the combined parity-time reversal symmetry, and finite inter-chain hopping. Using first-principles calculations, we identify the K_3Fe_2Se_4 family as a promising platform that realizes this mechanism, hosting a d-wave altermagnet even without lattice C_4 symmetry. Moreover, owing to its lower symmetry, the block-type folded chain exhibits an isotropic altermagnetic spin splitting, which may manifest as an altermagnetic wrapping effect. Our findings unify real-space block magnetism and reciprocal-space altermagnetism, establishing folded iron chains as a tunable platform for zero-moment spintronic applications.
ER -