Strain modulation of transport criticality in RuO2-based thick-film resistors

Vionnet-Menot, Sonia; Grimaldi, Claudio; Ryser, Peter; Maeder, Thomas; Strässler, Sigfrid
December 2004
Applied Physics Letters;12/6/2004, Vol. 85 Issue 23, p5619
Academic Journal
We show that in RuO2–glass composites the nonuniversal resistivity exponent can be modulated by an applied mechanical strain, signaled by a logarithmic divergence of the piezoresistive response at the percolation threshold. We interpret this phenomenon as being due to a tunneling-distance dependence of the transport exponent, supporting therefore a theory of transport nonuniversality proposed some years ago.


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