Abstract
Zero (ZF) and longitudinal field (LF) muon spin relaxation data of the d-metal alloy Ni1-xVx are presented at several vanadium concentrations x below and above the critical xc ≈ 11 % where long-range ferromagnetic (FM) order is suppressed. The clear single precession frequency observed for Ni, as expected for a homogeneous FM, changes to rather damped osciallation with small V substitution at x = 4 %, confirming magnetic inhomogeneities caused by the less magnetic V environments in the magnetic Ni matrix. Furthermore, local fields and spatial field distributions can be estimated to characterize different inhomogeneous regimes developing with x in the FM phase of Ni1-xVx. In the regime of x = 7 – 10 % a Kubo Toyabe function well describes the low temperature ZF and LF asymmetry data supporting a static Gaussian field distribution. Closer to the quantum critical concentration a single scale static Kubo Toyabe function with one field distribution is not sufficient to describe the muon relaxation. These data indicate that further changes in spatial distributions and dynamics are evolving as expected within the critical regime of a disordered quantum critical point.
Highlights
The study of quantum phase transitions (QPT) is a promising route to understand the origin of unconventional properties and in finding new phases in correlated many body systems
We present how to characterize the inhomogeneities in the FM and how they evolve upon dilution approaching a disordered QCP
Analyzing the muon asymmetry with a generalized KT model, PgenKT, the mean local field and the local field distribution could be determined for a large x regime
Summary
The study of quantum phase transitions (QPT) is a promising route to understand the origin of unconventional properties and in finding new phases in correlated many body systems. Examples for disordered systems are not rare, but the degree and significance of the “disorder” is often not clear. The binary alloy Ni1−xVx shows the obvious signs of such a disordered QPT from bulk investigations [2, 3] and is an ideal example for further microscopic studies. MuSR is ideally suited as spectroscopic and local probe [4] to reveal the first insights into these disordered magnetic phases as it has been successfully employed for spin glasses [5], reduced moment correlated electron systems like heavy fermions [6, 7, 8] and phase separated systems close to first order transitions like transition metal compounds [9] The binary alloy Ni1−xVx shows the obvious signs of such a disordered QPT from bulk investigations [2, 3] and is an ideal example for further microscopic studies. muSR is ideally suited as spectroscopic and local probe [4] to reveal the first insights into these disordered magnetic phases as it has been successfully employed for spin glasses [5], reduced moment correlated electron systems like heavy fermions [6, 7, 8] and phase separated systems close to first order transitions like transition metal compounds [9]
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