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

Journal Title

Physical Review X

Download

Share

COinS