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Probing the magnetic phases in the Ni-V alloy close to the disordered ferromagnetic quantum critical point with μSR.

机译:用μSR探测Ni-V合金中接近无序铁磁量子临界点的磁相。

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摘要

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.
机译:d-金属合金Ni1-xVx的零(ZF)和纵向场(LF)介子自旋弛豫数据显示在低于和高于临界xc≈11%的几种钒浓度x处,其中远距离铁磁(FM)阶被抑制。如对均匀FM所期望的,对于Ni观察到的清晰的单一进动频率变为相当阻尼的混浊,在x = 4%时具有较小的V取代,证实了由磁性Ni基体中较少的磁性V环境引起的磁性不均匀性。此外,可以估计局部场和空间场分布,以表征在Ni1-xVx的FM相中x形成的不同非均匀状态。在x = 7 – 10%的范围内,久保Toyabe函数很好地描述了支持静态高斯场分布的低温ZF和LF不对称数据。具有一个场分布的单尺度静态Kubo Toyabe函数更接近量子临界浓度,不足以描述介子弛豫。这些数据表明,在无序量子临界点的临界状态下,空间分布和动力学的进一步变化正在按预期发展。

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