🚀 go-pugleaf

   I would like to know if there are any materials that demonstrate negative
   resistance on the macroscopic scale.  I am aware of this behavior in tunnel
   diodes but I wonder if it might not occur in other structures. 

   For example, it seems plausible to me that the conductivity (albeit small)
   of a dielectric material may be sensitive to the electric field in unusual
   ways.  If leakage currents are primarily carried along grain boundaries then
   perhaps if the material was piezoelectric, under a field these current paths
   might become more restricted due to increased internal stresses.  Hence the
   resistance would increase with applied field.  A plot of V vs I in this case
   would have negative slope and thus Ohms law would be rewritten V=-IR.

   Anyone know of such a material?  Is it possible to design some sort of
   composite?  Not sure what applications it would be good for but sure would
   be a unique capability.




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