CRITICAL-BEHAVIOR OF YOUNG MODULUS FOR TWO-DIMENSIONAL RANDOMLY HOLED METALLIZED MYLAR

We have measured the conductance and Young's modulus of sheets of randomly holed metallized Mylar. The percolation threshold is pc=0.34±0.02, the conductivity exponent is t? =1.4±0.2, and the elastic exponent, f? =5.3±0.7, is at least 3/2 larger than that for lattices. This confirms Halperin, Feng, and Sen's prediction [ Phys. Rev. Lett. 54 2391 (1985)].