Quantitative Aspects of the Theory of Nearly Ferromagnetic Metals

Abstract

Effects of spin fluctuations on the magnetic susceptibility and the specific heat of nearly ferromagnetic metals are discussed quantitatively within the long wavelength approximation, by using four parameters specifying the nature of spin fluctuations. The temperature dependence of the low temperature specific heat is discussed in detail with particular reference to Ni 3 Ga and TiBe 2 . It is pointed out that the observed T 3 In T like behavior in TiBe 2 should not be attributed to the one derived previously from the long wave-length components of spin fluctuations. The specific heat due to localized paramagnons is also discussed and the T 3 ln T like behavior is found in a certain temperature range around a characteristic temperature \(\varGamma/2\pi\), \(\varGamma\) being the damping constant of localized paramagnons. The T 3 ln T like behavior observed in UPt 3 seems to be explained primarily by this effect rather than the contribution of small q -components of spin fluctuations as postulated in previous analyses.