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. 2015 Nov 9;5:16385. doi: 10.1038/srep16385

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(a–c) Logarithmic plots of the current-voltage (I−V) results at pressures of 0.41, 1.22 and 2.43 GPa. The I−V curves become broader at pressure above 0.8 GPa, where an AFM phase is induced. (d) Pressure evolution of the isothermal I−V curves at 7 K. The depinning critical current (I_c) is estimated by using the criterion of 1 μV, and the free-flux-flow critical current (I_f) is the value of the current at the inflection point, both of which are denoted by arrows.