Spatially Anisotropic Spin Fluctuations and the Non-Fermi Liquid Properties Around the Antiferromagnetic Instability

Abstract

In order to improve analyses of anomalous or non-Fermi liquid properties of certain heavy electron systems the self-consistent renormalization theory of spin fluctuations is extended to include spatial anisotropy of systems, introducing an anisotropy parameter (0 ≤ r_z ≤ 1) to interpolate between 2 and 3 dimensions. Physical properties in quantum critical regime and at higher temperatures are shown to be interpolated smoothly between 2 and 3 dimensions. In particular, the temperature range of T ln T-dependence of the specific heat expands with increasing spatial anisotropy (r_z → 0). A few example analyses of experimental results are given.