Abstract
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 41K for FeSe after protonation. Superconducting transitions with 𝑇c 15K for ZrNCl, 7.2K for 1𝑇-TaS2, and 3.8K for Bi2Se3 are induced after protonation. Electric transport in protonated FeSe0.93S0.07 confirms high-temperature superconductivity. Our 1H 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.
| Original language | English |
|---|---|
| Article number | 077401 |
| Journal | Chinese Physics Letters |
| Volume | 36 |
| Issue number | 7 |
| DOIs | |
| State | Published - 2019 |
Funding
Work at RUC was supported by the National Natural Science Foundation of China under Grant Nos 51872328, 11622437, 11574394, 11774423 and 11822412, the Strategic Priority Research Program of Chinese Academy of Sciences under Grant No XDB30000000, the Ministry of Science and Technology of China under Grant No 2016YFA0300504, the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (RUC) (15XNLQ07, 18XNLG14, 19XNLG17). SJ was supported by the National Natural Science Foundation of China under Grant Nos 11774007 and U1832214. YC was supported by the Outstanding Innovative Talents Cultivation Funded Programs 2018 of Renmin University of China. JQY was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Division of Materials Sciences and Engineering.