Spingläser — einige typische physikalische eigenschaften und modelle

In this review-article we first present and discuss some typical physical properties of spin-glass-alloys, such as magnetic susceptibility, hysteresis, time-dependent magnetic effects, Mössbauer-spectrum, neutron magnetic scattering, specific heat and electrical conductivity. In the second part we discuss some attempts to understand the empirical properties of these systems on the background of model-calculations. Some of the existing theories explain the low-temperature-properties of spin-glasses on the basis of a magnetic phase transition (of third order), others consider the possibility of a peculiar magnetic freezing phenomenon. More exact measurements of specific heat in the critical temperature region should decide this question.     

Über den Einsatz von Spline-Funktionen zur Glättung von Meßwerten bei der Abel-Inversion

Use of Spline-function for Smoothing Measured Values by Means of the Abel-inversion Method The application of so-called Spline-functions will reduce the noise-amplification, which results from the solution of an Abel-type equation in the presence of noise. In the discussed numerical procedure smoothing process and Abel-inversion — in this case of FRIE -type — are strongly separated. The procedure described below may be extended to systems of non-equidistant test-points.