Ferromagnetic quantum criticality in Sm1-xLaxNiC2 (x=0.85, 0.92, and 0.96)
- Authors
- Lee, W.; Lee, S.; Choi, K.-Y.; Lee, K.-J.; Kim, B.-J.; Suh, B.J.; Shin, S.; Park, T.
- Issue Date
- Dec-2017
- Publisher
- American Physical Society
- Citation
- Physical Review B, v.96, no.22
- Journal Title
- Physical Review B
- Volume
- 96
- Number
- 22
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/19007
- DOI
- 10.1103/PhysRevB.96.224433
- ISSN
- 2469-9950
- Abstract
- We report μSR experiments on the ternary compounds Sm1-xLaxNiC2 (x=0.85, 0.92, and 0.96), crossing from a ferromagnetic to a superconducting phase. Zero-field μSR measurements of the ferromagnetic sample (x=0.85) unveil a glassylike character of the ferromagnetically ordered state. At the putative quantum critical compound (x = 0.92), fluctuations of the Sm moments slow down below 2 K and remain dynamic down to 30 mK, showing persisting spin dynamics. Moreover, we find a time-field scaling (t/Hγ) of the μSR asymmetry function, evidencing quantum critical fluctuations. As to the superconducting material (x = 0.96), the muon spin-relaxation rate displays a λ-like peak at T=250 mK, indicating the coexistence of weak magnetism and filamentary superconductivity. Our results demonstrate that Sm1-xLaxNiC2 constitutes a model system for studying a ferromagnetic quantum critical point tuned by chemical pressure. © 2017 American Physical Society.
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