Nonlinear Response in a Polycrystalline Material
Department of Physics,
The Ohio State University, Columbus, Ohio 43210
We describe a simple method for modeling the cubic nonlinear response of
a polycrystalline sample of quasi-one-dimensional conductor.
We also propose a decoupling approximation for estimating this response.
The results show that a polycrystal of a uniaxial material may have a
nonlinear response which is enormously enhanced
by local field effects, relative to the single crystal.
A similar calculation shows that conductivity noise in such polycrystals
may also be greatly enhanced relative to the single-crystal.