Ionic-Liquid-Gating Induced Protonation and Superconductivity in FeSe, FeSe_0.93S_0.07, ZrNCl, 1T-TaS_2 and Bi_2Se_3
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Yi Cui,
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Ze Hu,
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Jin-Shan Zhang,
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Wen-Long Ma,
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Ming-Wei Ma,
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Zhen Ma,
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Cong Wang,
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Jia-Qiang Yan,
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Jian-Ping Sun,
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Jin-Guang Cheng,
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Shuang Jia,
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Yuan Li,
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Jin-Sheng Wen,
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He-Chang Lei,
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Pu Yu,
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Wei Ji,
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Wei-Qiang Yu
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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 T_\rm c is enhanced to 43.5 K for FeSe_0.93S_0.07, and 41 K for FeSe after protonation. Superconducting transitions with T_\rm c \sim 15 K for ZrNCl, \sim7.2 K for 1T-TaS_2, and \sim3.8 K for Bi_2Se_3 are induced after protonation. Electric transport in protonated FeSe_0.93S_0.07 confirms high-temperature superconductivity. Our ^1H nuclear magnetic resonance (NMR) measurements on protonated FeSe_1-xS_x reveal enhanced spin-lattice relaxation rate 1/^1T_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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Cite this article:
Yi Cui, Ze Hu, Jin-Shan Zhang, Wen-Long Ma, Ming-Wei Ma, Zhen Ma, Cong Wang, Jia-Qiang Yan, Jian-Ping Sun, Jin-Guang Cheng, Shuang Jia, Yuan Li, Jin-Sheng Wen, He-Chang Lei, Pu Yu, Wei Ji, Wei-Qiang Yu. Ionic-Liquid-Gating Induced Protonation and Superconductivity in FeSe, FeSe$_{0.93}$S$_{0.07}$, ZrNCl, 1$T$-TaS$_2$ and Bi$_2$Se$_3$[J].
Chin. Phys. Lett., 2019, 36(7): 077401.
DOI: 10.1088/0256-307X/36/7/077401
Yi Cui, Ze Hu, Jin-Shan Zhang, Wen-Long Ma, Ming-Wei Ma, Zhen Ma, Cong Wang, Jia-Qiang Yan, Jian-Ping Sun, Jin-Guang Cheng, Shuang Jia, Yuan Li, Jin-Sheng Wen, He-Chang Lei, Pu Yu, Wei Ji, Wei-Qiang Yu. Ionic-Liquid-Gating Induced Protonation and Superconductivity in FeSe, FeSe$_{0.93}$S$_{0.07}$, ZrNCl, 1$T$-TaS$_2$ and Bi$_2$Se$_3$[J]. Chin. Phys. Lett., 2019, 36(7): 077401. DOI: 10.1088/0256-307X/36/7/077401
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Yi Cui, Ze Hu, Jin-Shan Zhang, Wen-Long Ma, Ming-Wei Ma, Zhen Ma, Cong Wang, Jia-Qiang Yan, Jian-Ping Sun, Jin-Guang Cheng, Shuang Jia, Yuan Li, Jin-Sheng Wen, He-Chang Lei, Pu Yu, Wei Ji, Wei-Qiang Yu. Ionic-Liquid-Gating Induced Protonation and Superconductivity in FeSe, FeSe$_{0.93}$S$_{0.07}$, ZrNCl, 1$T$-TaS$_2$ and Bi$_2$Se$_3$[J]. Chin. Phys. Lett., 2019, 36(7): 077401. DOI: 10.1088/0256-307X/36/7/077401
Yi Cui, Ze Hu, Jin-Shan Zhang, Wen-Long Ma, Ming-Wei Ma, Zhen Ma, Cong Wang, Jia-Qiang Yan, Jian-Ping Sun, Jin-Guang Cheng, Shuang Jia, Yuan Li, Jin-Sheng Wen, He-Chang Lei, Pu Yu, Wei Ji, Wei-Qiang Yu. Ionic-Liquid-Gating Induced Protonation and Superconductivity in FeSe, FeSe$_{0.93}$S$_{0.07}$, ZrNCl, 1$T$-TaS$_2$ and Bi$_2$Se$_3$[J]. Chin. Phys. Lett., 2019, 36(7): 077401. DOI: 10.1088/0256-307X/36/7/077401
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