Authors
Marc Scheffler, Jörg Sichelschmidt, Conrad Clauss, Mojtaba Javaheri Rahim, Boris I Kochelaev, Cornelius Krellner, Christoph Geibel, Frank Steglich, Martin Dressel
Published in
Physical review letters. Volume 137. Issue 13. Pages 136506. Sep 25, 2026.
Abstract
In the heavy-fermion metal YbRh_{2}Si_{2}, 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 toward 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 toward the quantum-critical point. We analyze and discuss the results in the context of present theories on ESR in strongly correlated electron systems.
PMID:
42854129
Bibliographic data and abstract were imported from PubMed on 10 Oct 2026.
Read full publication at:
Please sign in
to see all details.
Advertisement
Stats
- Recommendations n/a n/a positive of 0 vote(s)
- Views 5
- Comments 0