SOME MAGNETIC-PROPERTIES OF THE S = 1/2 ISING SYSTEM WITH THE RANDOM EXCHANGE INTEGRAL - THE GAUSSIAN APPROXIMATION

The phase diagrams, magnetization curves, and specific heat are examined for the case of square and simple-cubic ferromagnets with quenched randomness of the exchange integral. The calculations are based on the Gaussian probability function. The results are similar to those obtained previously with the Handrich-Kaneyoshi (HK) method only for small values of the disorder parameter delta. For large values of delta significant differences appear and the Gaussian distribution cannot be approximated by a function of the HK type.