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Voltage oscillation associated with nonlinear conductivity in the organic conductor
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Molecular arrangements of BEDT-TTF in the -phase and (b) -phase, and (c) the temperature dependence of the resistance in . The horizontal charge order is depicted in (b), where charge-rich sites with about and charge-poor sites with are alternately arranged along the axis, and the zig-zag stripe continues along the axis.

Image of FIG. 2.
FIG. 2.

Current-voltage characteristics in , measured by applying regulated current pulses along (a) , (b) , and (c) . Oscillation appears in the shaded regions in (a) and (b) at 88 K.

Image of FIG. 3.
FIG. 3.

Voltage profiles measured at 88 K by applying current pulses in the three crystal directions.

Image of FIG. 4.
FIG. 4.

Fast Fourier transformation spectra of the characteristic oscillation observed at 88 K for .

Image of FIG. 5.
FIG. 5.

(a) Applied current dependence of the fundamental frequency observed at different temperatures. (b) Temperature dependence of in Eq. (2), estimated from the proportionality of the frequency to the current. The curve following is a guide for eye.

Image of FIG. 6.
FIG. 6.

Voltage-current characteristics of , measured along the crystallographic (a) , (b) , and (c) axes, by the two-probe method with a series resistor . The sample voltage is estimated from , where is the applied voltage and is the measured current, and and .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Voltage oscillation associated with nonlinear conductivity in the organic conductor α-(BEDT-TTF)2I3