Abstract
A quantum critical point (QCP) occurs upon chemical doping of the weak itinerant ferromagnet Sc 3.1 In . Remarkable for a system with no local moments, the QCP is accompanied by non-Fermi liquid behavior, manifested in the logarithmic divergence of the specific heat both in the ferro-and the paramagnetic states, as well as linear temperature dependence of the low-temperature resistivity. With doping, critical scaling is observed close to the QCP, as the critical exponents δ , γ , and β have weak composition dependence, with δ nearly twice and β almost half of their respective mean-field values. The unusually large paramagnetic moment μ PM ∼ 1.3 μ B / F . U . is nearly composition independent. Evidence for strong spin fluctuations, accompanying the QCP at x c = 0.035 ± 0.005 , may be ascribed to the reduced dimensionality of Sc 3.1 In , associated with the nearly one-dimensional Sc-In chains.
Document Type
Article
DOI
https://doi.org/10.1103/physrevx.5.011026
Rights Information
Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Keywords
condensed matter physics
Publication Date
2015
Recommended Citation
Svanidze, E., L. Liu, B. Frandsen, B. D. White, T. Besara, T. Goko, T. Medina et al. "Non-Fermi liquid behavior close to a quantum critical point in a ferromagnetic state without local moments." Physical Review X 5, no. 1 (2015): 011026.
Journal Title
Physical Review X
