TEMPERATURE-DEPENDENCE OF THE TRANSITION-METAL MAGNETIC-SUSCEPTIBILITIES

We present a method for calculating accurate Brillouin zone integrals of the Lindhard function at temperatures other than absolute zero. Wit hin the linear tetrahedron method our expression is exact for the imag inary part and accurate to any arbitrary precision for the real part. We apply our method to calculate the temperature-dependent contributio n to the bulk susceptibility for a range of transition metals as a fun ction of temperature using linear muffin-tin orbital (LMTO) bands. For paramagnets our results follow the expected T-2 dependence. However o ur results for ferromagnets deviate qualitatively from the quadratic l aw. The different behavior is attributed to interband and matrix eleme nt effects. Our results for Fe exhibit two distinct behaviors. We disc uss the implications for calculation of anomalies arising from spin fl uctuations.