Figure 3
From: A new way to synthesize superconducting metal-intercalated C60 and FeSe
Reversibility of superconductivity in C60 by the application of bias voltage with different polarity.
(a,c) Temperature dependence of magnetic susceptibility for EC−C60 for the application of bias voltage with different polarity. Two pellet samples of C60 were used (sample #1 and #2). (b) Time-sequence of bias voltage in sample #1. Firstly, a bias voltage of −2.0 V was applied for 40 h, and, at A, the temperature dependence of magnetic susceptibility was measured (see black solid circle in (a)). Then, a bias voltage of +0.2 V was applied for 1 h and the magnetic susceptibility was measured again (B). (d) Time-sequence of bias voltage in sample #2.
