Abstract
The electron spin resonance (ESR) of conduction electrons is reported for the weak itinerant ferromagnet Sc_{3.1}In which, upon chemical substitution with Lu, shows a suppression of ferromagnetic correlations. A well-defined ESR lineshape of Dysonian type characterizes the spectra. The ESR linewidth, determined by the spin dynamics, displays a broad minimum only for the Sc_{3.1}In compound. We discuss the results using the mechanism of exchange enhancement of spin-lifetimes.
Highlights
The weak itinerant ferromagnet Sc3.1 In recently came into focus, because a quantum critical point (QCP), accompanied by non-Fermi liquid behavior, was reported to occur upon chemical substitution of the Sc site by Lu [1]
This was a remarkable observation as Sc3.1 In is a rare example of an itinerant ferromagnet composed of non-magnetic elements for which quantum critical behavior has been investigated
The reduced crystallographic dimensionality favours strong spin fluctuations, which give rise to the magnetism, which is well described by a modified Curie–Weiss-like law for weak itinerant ferromagnets [2]
Summary
The weak itinerant ferromagnet Sc3.1 In recently came into focus, because a quantum critical point (QCP), accompanied by non-Fermi liquid behavior, was reported to occur upon chemical substitution of the Sc site by Lu [1]. The QCP was found to occur at a critical composition xc = 0.035 ± 0.005 as evidenced by an analysis of the magnetization data as well as muon-spin relaxation measurements. This was a remarkable observation as Sc3.1 In is a rare example of an itinerant ferromagnet composed of non-magnetic elements for which quantum critical behavior has been investigated. An investigation of the ESR in (Sc1−xLux)3.1 In should, in principle, enable us to observe how changing the ferromagnetic correlations with Lu substitution influences the linewidth
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