Temperature Dependence of Positron Annihilation in Plastically Deformed Copper

概要

論文の詳細を見る
Doppler-broadened photopeaks resulting from positron annihilation in as-de-formed and recovered copper crystals were measured as a function of temperature be-tween 4.2 and 275 K. In the as-deformed state, a significant line narrowing for increas-ing temperature was observed in the range below about 100 K. 'I'his low-temperatureeffect was removed by recovery annealing up to 573 K, at which the annealing out ofdislocations had taken place. The results from the as-deformed state were explainedin terms of thermal detrapping of positrons from shallow traps ?tlong the dislocationline, with subsequent retrapping either at submicroscopic vacancy clusters or deepertraps associated with dislocations. An activation energy for detrapping was estimatedto be less than 0.01 eV.
社団法人日本物理学会の論文
1988-09-15