✍ Scribed by V.L. Sedov; O.A. Tsigel'nik
No coin nor oath required. For personal study only.
The temperature dependence of angular correlation annihilation radiation ACAR in Invar Fe-Ni alloys is investigated. It is found that the ACAR distribution in the Curie temperature region T depends on temperature. This effect is created C only by those positrons that are trapped by vacancies. The effect is enhanced if the positrons trapped by vacancy-hydrogen complexes. The ACAR distribution is changed due to enhanced interaction of these positrons with 3d electrons. A simple interpretation of this phenomenon can be given on the basis of the model of two magnetic states of Fe atoms in Invar alloys. According to this model the enhancement of the electron-positron correlation interaction in the T region occurs as a result C Ž .
Ž . of the convergence of the energy levels ´and ´corresponding to the high-spin HS and low-spin LS states of Fe HS LS atoms.
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