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The device of electric double-layer transistor (EDLT) with ionic liquid hasbeen employed as an effective way to dope carriers over a wide range, which caninduce metallic state, magnetic reconstruction and superconducting transition.However, the induced electronic state can hardly survive in the materials afterreleasing the gate voltage, strongly restricting the experimental study fordiscovery of physics. Here, we show that a permanent superconductivity withtransition temperature $T_c$ of 24 and 15 K is realized in single crystals andpolycrystalline samples of HfNCl and ZrNCl upon applying proper gate voltage$V_{\rm G}$, respectively. Reversible change between insulating andsuperconducting state can be obtained through applying positive and negative$V_{\rm G}$ at low temperature such as 220 K, whereas $V_{\rm G}$ applied athigh temperatures ($\geq$ 250 K) could induce partial deintercalation of Clions and result in irreversible superconducting transition. The present resultsclarify a connection between traditional chemical synthesis and theelectrochemical mechanism of the EDLT induced superconductivity. Such atechnique shows a great potential to systematically tune the bulk electronicstate in the similar two-dimensional (2D) systems.

Electric field induced permanent superconductivity in layered metal nitride chloride MNCl(M: Hf and Zr)