Saturating T2 resistivity in iron-based superconductors
Abstract
Many correlated metals exhibit a crossover from low-temperature ρ∝ T2 behavior to a slower increase of the resistivity at elevated temperatures. Distinguishing phonon scattering from electron--electron correlations as the origin of this crossover is experimentally challenging. We introduce a simple phenomenological framework that isolates the contribution responsible for the high-temperature saturating tendency. This approach reveals a clear contrast between systems well known for the predominance of electron--phonon scattering and several iron-based superconductors. For the latter, the conductivity can be expressed as the sum of a Fermi-liquid-like term (∝ 1/T2) and a temperature-independent component, which together describe ρ(T) up to ∼ 250 K in LiFeAs, KFe2As2, and KCaFe4As4. In FeSe, the same approach identifies a similar regime above the nematic transition, with a pronounced change toward nearly linear-in-T resistivity below it. We discuss these findings in the broader context of coherence and electronic correlations in Hund's metals.
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BibTeX
@misc{amigo2026saturating,
title = {{Saturating $T^2$ resistivity in iron-based superconductors}},
author = {M. Lourdes Amigó and Jorge I. Facio},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.28240},
eprint = {2610.28240},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.28240},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Saturating T^2 resistivity in iron-based superconductors
AU - M. Lourdes Amigó
AU - Jorge I. Facio
PY - 2026
DA - 2026/10/20
PB - arXiv
DO - 10.48550/arxiv.2610.28240
UR - https://arxiv.org/abs/2610.28240
AB - Many correlated metals exhibit a crossover from low-temperature ρ∝ T^2 behavior to a slower increase of the resistivity at elevated temperatures. Distinguishing phonon scattering from electron--electron correlations as the origin of this crossover is experimentally challenging. We introduce a simple phenomenological framework that isolates the contribution responsible for the high-temperature saturating tendency. This approach reveals a clear contrast between systems well known for the predominance of electron--phonon scattering and several iron-based superconductors. For the latter, the conductivity can be expressed as the sum of a Fermi-liquid-like term (∝ 1/T^2) and a temperature-independent component, which together describe ρ(T) up to ∼ 250 K in LiFeAs, KFe_2As_2, and KCaFe_4As_4. In FeSe, the same approach identifies a similar regime above the nematic transition, with a pronounced change toward nearly linear-in-T resistivity below it. We discuss these findings in the broader context of coherence and electronic correlations in Hund's metals.
ER -