Anomalous Superfluid Response in Altermagnetic Superconductors
Abstract
We report on the emergence of the anomalous (paramagnetic) superfluid response in altermagnetic superconductors at arbitrary impurity concentrations. Due to anisotropic gapless superconductivity, altermagnetic superconductors with an out-of-plane Zeeman field display an anisotropic paramagnetic Meissner effect. The effect is strongest for parallel altermagnetic and Zeeman exchange field vectors and in the clean sample. The presence of nonmagnetic impurities leads to isotropisation and, consequently, weakens the effect; however, the paramagnetic response sustains intermediate amounts of impurities in the system. As demonstrated in recent experiments, microwave superfluid stiffness measurements can serve as a sensitive probe of gapless superconductivity.
Related
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BibTeX
@misc{wiedemann2026anomalous,
title = {{Anomalous Superfluid Response in Altermagnetic Superconductors}},
author = {Christian Wiedemann and Danilo Nikolić and Matthias Eschrig and Wolfgang Belzig},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.02263},
eprint = {2609.02263},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.02263},
}
RIS
TY - UNPB
TI - Anomalous Superfluid Response in Altermagnetic Superconductors
AU - Christian Wiedemann
AU - Danilo Nikolić
AU - Matthias Eschrig
AU - Wolfgang Belzig
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.02263
UR - https://arxiv.org/abs/2609.02263
AB - We report on the emergence of the anomalous (paramagnetic) superfluid response in altermagnetic superconductors at arbitrary impurity concentrations. Due to anisotropic gapless superconductivity, altermagnetic superconductors with an out-of-plane Zeeman field display an anisotropic paramagnetic Meissner effect. The effect is strongest for parallel altermagnetic and Zeeman exchange field vectors and in the clean sample. The presence of nonmagnetic impurities leads to isotropisation and, consequently, weakens the effect; however, the paramagnetic response sustains intermediate amounts of impurities in the system. As demonstrated in recent experiments, microwave superfluid stiffness measurements can serve as a sensitive probe of gapless superconductivity.
ER -