Abstract
The current-voltage (I-V) characteristics and electrical switching behaviours of As40Te60-xIn x (5 ≤ x ≤ 16.5), As35Te65_ x In x . (10 ≤ x ≤ 19) and As30Te70-xInx (12.5 ≤ x ≤ 21.5) have been studied over wide ranges of indium concentrations x and average coordination numbers (r). All the glasses studied show a threshold switching behaviour. Further, the composition dependence of the switching field is found to exhibit a distinct change in slope at (r) = 2.65 and a local minimum at around (r) = 2.69. These results indicate the possibility that rigidity percolation occurs at around (r) = 2.65 and chemical threshold around (r) = 2.69.