The current± voltage (I± V) characteristics and electrical switching behaviours of As 40 Te 60¡ x In x … 5 4 x 4 16:5 †, As 35 Te 65¡ x In x … 10 4 x 4 19 † and As 30 Te 70¡ x In x … 12:5 4 x 4 21:5 † have been studied over wide ranges of indium concentrations x and average coordination numbers h ri . All the glasses studied show a threshold switching behaviour. Further, the composition dependence of the switching ® eld is found to exhibit a distinct change in slope at h riˆ2:65 and a local minimum at around h riˆ2:69. These results indicate the possibility that rigidity percolation occurs at around h riˆ2:65 and chemical threshold around h riˆ2:69.
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