Journal
CHINESE PHYSICS LETTERS
Volume 36, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/36/7/077401
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Funding
- National Natural Science Foundation of China [11774007, U1832214, 51872328, 11622437, 11574394, 11774423, 11822412]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB30000000]
- Ministry of Science and Technology of China [2016YFA0300504]
- Fundamental Research Funds for the Central Universities
- Research Funds of Renmin University of China (RUC) [15XNLQ07, 18XNLG14, 19XNLG17]
- Outstanding Innovative Talents Cultivation Funded Programs 2018 of Renmin University of China
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Division of Materials Sciences and Engineering
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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 T-c is enhanced to 43.5K for FeSe0.93S0.07, and 41K for FeSe after protonation. Superconducting transitions with T-c similar to 15K for ZrNCl, similar to 7.2K for 1T-TaS2, and similar to 3.8K for Bi2Se3 are induced after protonation. Electric transport in protonated FeSe0.93S0.07 confirms high-temperature superconductivity. Our H-1 nuclear magnetic resonance (NMR) measurements on protonated FeSe1-xSx reveal enhanced spin-lattice relaxation rate 1/T-1(1) with increasing x, which is consistent with the LDA calculations that H+ is located in the interstitial sites close to the anions.
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