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Critical Fluctuations and Conserved Dynamics in a Strange Ferromagnetic Metal
Jin Zhan1, Yongjun Zhang2, Jiawen Zhang1
1Zhejiang University, New Cornerstone Science Laboratory, Center for Correlated Matter and School of Physics, Hangzhou 310058, China.
Physical Review Letters
|January 20, 2026
Summary
Researchers uncovered a new quantum critical point (QCP) in the strange metal ferromagnet CeRh_{6}Ge_{4}. This finding, with a dynamical critical exponent z=3, suggests a conserved degree of freedom is involved in strange metallic behavior.
Area of Science:
- Condensed matter physics
- Quantum materials science
- Quantum criticality
Background:
- Strange metallic behavior in quantum materials is a long-standing puzzle.
- Previously linked to antiferromagnetic quantum critical points (QCPs), new materials show links to uniform order parameters like ferromagnetism.
Purpose of the Study:
- To investigate the origin of strange metallic behavior in a new class of quantum materials.
- To characterize the quantum critical point in the strange-metal ferromagnet CeRh_{6}Ge_{4}.
Main Methods:
- Experimental observation of a divergence in the Grüneisen ratio at the QCP.
- Analysis of the dynamical critical exponent (z) associated with order parameter fluctuations.
Main Results:
- Observed a divergence in the Grüneisen ratio at the QCP of CeRh_{6}Ge_{4}.
- Determined a dynamical critical exponent z=3, indicating a conserved degree of freedom at the quantum singularity.
- The observed criticality deviates from the standard Landau paradigm.
Conclusions:
- The z=3 strange criticality suggests a deeper common denominator for strange metallic behavior across different quantum materials.
- Propose a link between this criticality, gauge modes, and Fermi surface transitions.
- This finding necessitates a theoretical framework beyond the conventional Landau theory.
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