Study of the high temperature superconductivity of iron-chalcogenide superconductors via combining the micro-structure fabricating and ion-gating technique

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We have performed a systematical study of the transport properties on a c-axis lamella of FeSe prepared by the FIB pick-up technique. With this lamella, we can put contacts along the c-axis, to directly measure the out-of-plane transport properties. With the decrease of temperature, ρc firstly slightly increases until ~220 K, then decreases, manifesting a hump-like behavior. Such temperature dependent behavior is quite different from the in-plane resistivity ρab, which shows a metallic behavior, continually decreasing with temperature. Besides, we also studied the current-voltage curve, critical current density, upper critical fields, and magnetoresistance to reveal the out-of-plane electrical properties of FeSe.