Numerical mean field studies of the site disordered spin glassCuMn

Numerical mean field studies ofCuMn alloys have been performed for different concentration and external magnetic field strengths in a wide temperature range using a cube with 12*12*12 lattice points and periodic boundary conditions. The calculations include only RKKY interaction based on hyperfine field measurements by Slichter and coworkers. They result in realistic values for the spin glass transition temperturesT _f . The temperature was varied from the paramagnetic regime down to the deeply frozen state far belowT _f . The exchange and hyperfine field distributions have been calculated. The copper NMR spectra of the main line and the satellites are shown. Moreover, the temperature behavior of the order parameter, the probe magnetization, the magnetic heat capacity and the NMR line width are given.