Spin fluctuations in nearly magnetic metals from ab initio dynamical spin susceptibility calculations: Application to Pd and Cr95V5

We describe our theoretical formalism and computational scheme for making a b initio calculations of the dynamic paramagnetic spin susceptibilities of metals and alloys at finite temperatures. Its basis is time-dependent densi ty functional theory within an electronic multiple scattering, imaginary ti me Green function formalism. Results receive a natural interpretation in te rms of overdamped oscillator systems making them suitable for incorporation into spin fluctuation theories. For illustration we apply our method to th e nearly ferromagnetic metal Pd and the nearly antiferromagnetic chromium a lloy Cr95V5 We compare and contrast the spin dynamics of these two metals a nd in each case identify those fluctuations with relaxation times much long er than typical electronic "hopping times."