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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Accès en ligne: | https://arxiv.org/abs/2510.20352 |
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| _version_ | 1866914226479562752 |
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| author | Zhan, Jin Zhang, Yongjun Zhang, Jiawen Liu, Yu Nie, Zhiyong Chen, Yuxin Jiao, Lin Komijani, Yashar Smidman, Michael Steglich, Frank Coleman, Piers Yuan, Huiqiu |
| author_facet | Zhan, Jin Zhang, Yongjun Zhang, Jiawen Liu, Yu Nie, Zhiyong Chen, Yuxin Jiao, Lin Komijani, Yashar Smidman, Michael Steglich, Frank Coleman, Piers Yuan, Huiqiu |
| contents | The origin of the strange metallic behavior observed in a wide range of quantum materials is an open challenge to condensed matter physics. Historically, strange metals were uniquely associated with antiferromagnetic quantum critical points (QCPs), but a new generation of materials reveals their association with uniform order parameters, such as ferromagnetism, valley or nematic order, suggesting a deeper common denominator. At a QCP, order parameter fluctuations are characterized by the dynamical critical exponent $z$, which quantifies the space-time scaling asymmetry. Here, we report the observation of a divergence in the Grüneisen ratio at the QCP of the strange-metal ferromagnet CeRh$_6$Ge$_4$ with a dynamical critical exponent $z=3$, signaling that the underlying quantum singularity involves a conserved degree of freedom. Yet the magnetization of this easy-plane ferromagnet is not conserved. We argue that the $z=3$ strange criticality requires a description beyond the Landau paradigm, proposing a link with the gauge modes of the small-to-large Fermi surface transition and the associated gauge charge of the delocalizing heavy electrons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_20352 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Critical fluctuations and conserved dynamics in a strange ferromagnetic metal Zhan, Jin Zhang, Yongjun Zhang, Jiawen Liu, Yu Nie, Zhiyong Chen, Yuxin Jiao, Lin Komijani, Yashar Smidman, Michael Steglich, Frank Coleman, Piers Yuan, Huiqiu Strongly Correlated Electrons The origin of the strange metallic behavior observed in a wide range of quantum materials is an open challenge to condensed matter physics. Historically, strange metals were uniquely associated with antiferromagnetic quantum critical points (QCPs), but a new generation of materials reveals their association with uniform order parameters, such as ferromagnetism, valley or nematic order, suggesting a deeper common denominator. At a QCP, order parameter fluctuations are characterized by the dynamical critical exponent $z$, which quantifies the space-time scaling asymmetry. Here, we report the observation of a divergence in the Grüneisen ratio at the QCP of the strange-metal ferromagnet CeRh$_6$Ge$_4$ with a dynamical critical exponent $z=3$, signaling that the underlying quantum singularity involves a conserved degree of freedom. Yet the magnetization of this easy-plane ferromagnet is not conserved. We argue that the $z=3$ strange criticality requires a description beyond the Landau paradigm, proposing a link with the gauge modes of the small-to-large Fermi surface transition and the associated gauge charge of the delocalizing heavy electrons. |
| title | Critical fluctuations and conserved dynamics in a strange ferromagnetic metal |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.20352 |