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

Journal Article · · Chinese Physics Letters
 [1];  [2];  [3];  [4];  [4];  [5];  [2];  [6];  [7];  [7];  [8];  [8];  [9];  [2];  [10];  [2];  [2]
  1. North China Electric Power Univ., Beijing (China). School of Mathematics and Physics; Renmin Univ., Beijing (China). Dept. of Physics, and Beijing Key Lab. of Optoelectronic Functional Materials & Micro-nano Devices
  2. Renmin Univ., Beijing (China). Dept. of Physics, and Beijing Key Lab. of Optoelectronic Functional Materials & Micro-nano Devices
  3. North China Electric Power Univ., Beijing (China). School of Mathematics and Physics
  4. Peking Univ., Beijing (China). International Center for Quantum Materials, School of Physics
  5. Nanjing Univ., Nanjing (China). National Lab. of Solid State Microstructures and Dept. of Physics
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  7. Chinese Academy of Sciences, Beijing (China). Beijing National Lab. for Condensed Matter Physics and Institute of Physics
  8. Peking Univ., Beijing (China). International Center for Quantum Materials, School of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
  9. Nanjing Univ., Nanjing (China). National Lab. of Solid State Microstructures and Dept. of Physics; Nanjing Univ. (China). Innovative Center for Advanced Microstructures
  10. Collaborative Innovation Center of Quantum Matter, Beijing (China); Tsinghua Univ., Beijing (China). State Key Lab. of Low Dimensional Quantum Physics and Dept. of Physics

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 43.5 K 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 1H nuclear magnetic resonance (NMR) measurements on protonated FeSe1-xSx reveal enhanced spin-lattice relaxation rate 1/1 T1 with increasing x, which is consistent with the LDA calculations that H+ is located in the interstitial sites close to the anions.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1564119
Journal Information:
Chinese Physics Letters, Vol. 36, Issue 7; ISSN 0256-307X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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