Evolution of electron spin resonance through a metallic quantum critical phase diagram
Abstract
In the heavy-fermion metal YbRh2Si2, quantum criticality at a suppressed antiferromagnetic order is governed by the interplay of local magnetic moments and itinerant conduction electrons. We demonstrate how this can be investigated by a new experimental approach that enables the observation of electron spin resonance (ESR) across a broad range of frequencies and fields at very low temperatures. This allowed us to cover a large part of the phase diagram from the paramagnetic Fermi-liquid phase to the phase with antiferromagnetic order and including the quantum-critical regime. Both the ESR g-factor and the linewidth present distinct behaviors in these three regimes, providing further insight into the physics across a quantum critical point. Notably, when cooling down at a field directly towards the quantum critical point, both g-factor and linewidth continuously decrease. Furthermore, we observe a very good matching of the g-factor behavior upon field-tuning and temperature-tuning towards the quantum-critical point. We analyze and discuss the results in the context of present theories on ESR in strongly correlated electron systems.
Versions
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BibTeX
@misc{scheffler2026evolution,
title = {{Evolution of electron spin resonance through a metallic quantum critical phase diagram}},
author = {Marc Scheffler and Jörg Sichelschmidt and Conrad Clauss and Mojtaba Javaheri Rahim and Boris I. Kochelaev and Cornelius Krellner and Christoph Geibel and Frank Steglich and Martin Dressel},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.03994},
eprint = {2609.03994},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.03994},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Evolution of electron spin resonance through a metallic quantum critical phase diagram
AU - Marc Scheffler
AU - Jörg Sichelschmidt
AU - Conrad Clauss
AU - Mojtaba Javaheri Rahim
AU - Boris I. Kochelaev
AU - Cornelius Krellner
AU - Christoph Geibel
AU - Frank Steglich
AU - Martin Dressel
PY - 2026
DA - 2026/10/08
PB - arXiv
DO - 10.48550/arxiv.2609.03994
UR - https://arxiv.org/abs/2609.03994
AB - In the heavy-fermion metal YbRh2Si2, quantum criticality at a suppressed antiferromagnetic order is governed by the interplay of local magnetic moments and itinerant conduction electrons. We demonstrate how this can be investigated by a new experimental approach that enables the observation of electron spin resonance (ESR) across a broad range of frequencies and fields at very low temperatures. This allowed us to cover a large part of the phase diagram from the paramagnetic Fermi-liquid phase to the phase with antiferromagnetic order and including the quantum-critical regime. Both the ESR g-factor and the linewidth present distinct behaviors in these three regimes, providing further insight into the physics across a quantum critical point. Notably, when cooling down at a field directly towards the quantum critical point, both g-factor and linewidth continuously decrease. Furthermore, we observe a very good matching of the g-factor behavior upon field-tuning and temperature-tuning towards the quantum-critical point. We analyze and discuss the results in the context of present theories on ESR in strongly correlated electron systems.
ER -