(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.
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.
Voltage profiles measured at 88 K by applying current pulses in the three crystal directions.
Fast Fourier transformation spectra of the characteristic oscillation observed at 88 K for .
(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.
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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