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

Abstract

The device of electric double-layer transistor (EDLT) with ionic liquid has been employed as an effective way to dope carriers over a wide range, which can induce metallic state, magnetic reconstruction and superconducting transition. However, the induced electronic state can hardly survive in the materials after releasing the gate voltage, strongly restricting the experimental study for discovery of physics. Here, we show that a permanent superconductivity with transition temperature $T_c$ of 24 and 15 K is realized in single crystals and polycrystalline samples of HfNCl and ZrNCl upon applying proper gate voltage $V_{\mathrm{G}}$, respectively. Reversible change between insulating and superconducting state can be obtained through applying positive and negative $V_{\mathrm{G}}$ at low temperature such as 220 K, whereas $V_{\mathrm{G}}$ applied at high temperatures ($\ge$ 250 K) could induce partial deintercalation of Cl ions and result in irreversible superconducting transition. The present results clarify a connection between traditional chemical synthesis and the electrochemical mechanism of the EDLT induced superconductivity. Such a technique shows a great potential to systematically tune the bulk electronic state in the similar two-dimensional (2D) systems.

References in corpus (7)

• Controlling many-body states by the electric-field effect in a two-dimensional material
• Evolution of high-temperature superconductivity from low-Tc phase tuned by carrier concentration in FeSe thin flakes
• A full superconducting dome of strong Ising protection in gated monolayer WS2
• Quantum phase transitions in highly crystalline two-dimensional superconductors
• Electrically tuned magnetic order and magnetoresistance in a topological insulator
• Protonation induced high-Tc phases in iron-based superconductors evidenced by NMR and magnetization measurements
• Superconductivity in Yb${}_x$($Me$)${}_y$HfNCl ($Me$ = NH${}_3$ and THF)

Cited by in corpus (4)

• Ionic-liquid-gating induced protonation and superconductivity in FeSe, FeSe0.93S0.07, ZrNCl, 1T-TaS2, and Bi2Se3
• Ambipolar suppression of superconductivity by ionic gating in optimally-doped BaFe2(As,P)2 ultrathin films
• Dominant role of processing temperature in electric field induced superconductivity in layered ZrNBr
• Reversible Tuning of Superconductivity in Ion-Gated NbN Ultrathin Films by Self-Encapsulation with a High-$\kappa$ Dielectric Layer