Abstract
The magnetic susceptibility \ensuremath{\chi}, the Knight shift K, and the nuclear spin-lattice relaxation rate 1/${T}_{1}$ have been measured in Y(${\mathrm{Co}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Al}}_{\mathrm{x}}$${)}_{2}$ over a wide concentration range of Al from a nearly ferromagnetic to a weakly ferromagnetic phase. The values of 1/${T}_{1}$T from low temperature to high temperature were found to be well described by the self-consistent renormalization theory of spin fluctuations. From the analysis of 1/${T}_{1}$T the characteristic energy width of the dynamical spin-fluctuation spectrum is systematically estimated through this concentration range. It was found that these widths have quite different values on both sides of the critical concentration x=0.12, suggesting a discontinuous electronic-state change with the onset of weak itinerant ferromagnetism.
Published Version
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