Glassy Relaxation Dynamics in the Two-Dimensional Heavy Fermion Antiferromagnet CeSiI
The recent discovery of the van der Waals (vdW) layered heavy fermion antiferromagnetic metal CeSiI offers promising potential for achieving accessible quantum criticality in the two-dimensional (2D) limit. CeSiI exhibits both heavy fermion behavior and antiferromagnetic (AFM) ordering, while the exact magnetic structure and phase diagram are yet to be determined. Here, we investigate the magnetic properties of atomically thin CeSiI devices with thicknesses ranging from 2 to 15 vdW layers. The thickness-dependent magnetotransport measurement reveals the intrinsic 2D nature of heavy fermion behavior and antiferromagnetism. Notably, we also find an isotropic, time-dependent hysteresis in both magnetoresistance and Hall resistance, showing glassy relaxation dynamics. This glassy behavior in magnetic structures may suggest the presence of spin glass phases or multipolar ordering, further establishing CeSiI as an intriguing material system for investigating the interplay between magnetic orders and the Kondo effect.
Authors
- Philip Kim (ORCID: https://orcid.org/0000-0002-8255-0086)
- Kierstin Torres (ORCID: https://orcid.org/0000-0002-0463-7805)
- Kevin J. Anderton (ORCID: https://orcid.org/0000-0002-2599-9143)
- Michael E. Ziebel (ORCID: https://orcid.org/0000-0003-1857-8292)
- Takashi Taniguchi (ORCID: https://orcid.org/0000-0002-1467-3105)
- Dongtao Cui
- Kenji Watanabe (ORCID: https://orcid.org/0000-0003-3701-8119)
- Abhay N. Pasupathy (ORCID: https://orcid.org/0000-0002-2744-0634)
- Victoria A. Posey (ORCID: https://orcid.org/0000-0003-0525-7510)
- Xavier Roy (ORCID: https://orcid.org/0000-0002-8850-0725)
- Claire Casaday (ORCID: https://orcid.org/0000-0002-9238-0463)
- Joon Young Park (ORCID: https://orcid.org/0009-0001-6967-2767)
- B.J. Tang
Institutions
- National Institute for Materials Science (JP)
- Harvard University Press (US)
- Columbia University (US)
- Sungkyunkwan University (KR)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-04-16
- DOI
- https://doi.org/10.1021/acs.nanolett.4c05920
- Primary Topic
- Rare-earth and actinide compounds
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Research Foundation of Korea
- Japan Society for the Promotion of Science
- Division of Materials Research
- Division of Electrical, Communications and Cyber Systems
- Basic Energy Sciences