Abstract
On the basis of a uniaxially anisotropic quasi-particle band model and the resultant wavevector-dependent response function, the coexistence of ferro- and antiferromagnetic spin fluctuations and their effects on the low-temperature specific heat (mass enhancement, T3 ln T law) of exchange-enhanced paramagnetic systems are studied in the framework of paramagnon theory. The results are related to the localised-paramagnon approximation. The anisotropic spin-fluctuation model may explain the results of both the specific heat and neutron scattering experiments on UPt3.
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