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- W4206306587 abstract "We performed third-order electrical conductivity measurements on the organic conductor α-(BEDT-TTF)2I3 using an ac bridge technique sensitive to nonlinear signals. Third-order conductance G3 is clearly observed even at low electric fields, and interestingly, G3 is critically enhanced above the charge-order transition temperature TCO = 136 K. The observed frequency dependence of G3 is incompatible with a percolation model, in which a Joule heating in a random resistor network is relevant to the nonlinear conduction. We instead argue the nonlinearity of the relaxation time according to a phenomenological model on the mobility in materials with large dielectric constants, and find that the third-order conductance G3 corresponds to the third-order electric susceptibility χ3. Since the nonlinear susceptibility is known as a probe for higher-order multipole ordering, the present observation of the divergent behavior of G3 above TCO reveals an underlying quadrupole instability at the charge-order transition of the organic system." @default.
- W4206306587 created "2022-01-25" @default.
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- W4206306587 date "2022-02-15" @default.
- W4206306587 modified "2023-09-27" @default.
- W4206306587 title "Third-order Electrical Conductivity of the Charge-ordered Organic Salt α-(BEDT-TTF)2I3" @default.
- W4206306587 doi "https://doi.org/10.7566/jpsj.91.023703" @default.
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