Ionic-Liquid-Gating Induced Protonation and Superconductivity in FeSe,FeSe0.93S0.07, ZrNCl, 1T-TaS2 and Bi2Se3

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2019,（7）
• 页码范围: 90-93
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/36/7/077401

摘要

We report protonation in several compounds by an ionic-liquid-gating method,under optimized gating conditions.This leads to single superconducting phases for several compounds.Non-volatility of protons allows post-gating magnetization and transport measurements.The superconducting transition temperature Tc is enhanced to 43.5K for FeSe0.93S0.07,and 41 K for FeSe after protonation.Superconducting transitions with Tc ～ 15 K for ZrNCl,～7.2 K for 1T-TaS2,and ～3.8 K for Bi2Se3 are induced after protonation.Electric transport in protonated FeSe0.93S0.07 confirms high-temperature superconductivity.Our 1 H nuclear magnetic resonance (NMR) measurements on protonated FeSe1-xSx reveal enhanced spin-lattice relaxation rate 1/1T1 with increasing x,which is consistent with the LDA calculations that H+ is located in the interstitial sites close to the anions.