Ionic-Liquid-Gating Induced Protonation and Superconductivity in FeSe, FeSe0.93S0.07, ZrNCl, 1T-TaS2 and Bi2Se3
Ionic-Liquid-Gating Induced Protonation and Superconductivity in FeSe, FeSe0.93S0.07, ZrNCl, 1T-TaS2 and Bi2Se3
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FeSe、FeSe0.93S0.07、ZrNCl、1T-TaS2 和 Bi2Se3 中离子液体门控诱导质子化和超导
DOI：
10.1088/0256-307x/36/7/077401
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发表时间：
2019-07-01
影响因子：
3.5
通讯作者：
Yu, Wei-Qiang
中科院分区：
文献类型：
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作者：
Cui, Yi;Hu, Ze;Yu, Wei-Qiang
我们报告质子化在几个化合物的离子液体门控方法，在优化的门控条件下。这导致几种化合物的单一超导相。质子的非挥发性允许门控后磁化和传输测量。质子化后，FeSe_（0.93）S_（0.07）的超导转变温度Tc提高到43.5K，FeSe的超导转变温度Tc提高到41 K。质子化后，ZrNCl、1 T-TaS 2和Bi_2Se_3的超导转变温度分别为T_c = 15 K、T_c = 7.2K和T_c = 3.8K。质子化FeSe 0.93S 0.07的电输运证实了高温超导性。我们对质子化FeSe 1 −xSx的1H核磁共振（NMR）测量显示，随着x的增加，自旋-晶格弛豫速率增加1/1 T1，这与LDA计算一致，H+位于靠近阴离子的间隙位置。
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 1/1T1 with increasing x, which is consistent with the LDA calculations that H+ is located in the interstitial sites close to the anions.