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| 1 | Protonation induced high-T_c phases in iron-based superconductors evidenced by NMR and magnetization measurements显示文摘Chemical substitution during growth is a well-established method to manipulate electronic states of quantum materials, and leads to rich spectra of phase diagrams in cuprate and iron-based superconductors. Here we report a novel and generic strategy to achieve nonvolatile electron doping in series of(i.e.11 and 122 structures) Fe-based superconductors by ionic liquid gating induced protonation at room temperature. Accumulation of protons in bulk compounds induces superconductivity in the parent compounds, and enhances the Tclargely in some superconducting ones. Furthermore, the existence of proton in the lattice enables the first proton nuclear magnetic resonance(NMR) study to probe directly superconductivity. Using Fe S as a model system, our NMR study reveals an emergent high-Tcphase with no coherence peak which is hard to measure by NMR with other isotopes. This novel electric-fieldinduced proton evolution opens up an avenue for manipulation of competing electronic states(e.g.Mott insulators), and may provide an innovative way for a broad perspective of NMR measurements with greatly enhanced detecting resolution. | Yi Cui Gehui Zhang Haobo Li Hai Lin Xiyu Zhu Hai-Hu Wen Guoqing Wang Jinzhao Sun Mingwei Ma Yuan Li Dongliang Gong Tao Xie Yanhong Gu Shiliang Lie Huiqian Luo Pu Yu Weiqiang Yu | 2018 | Science Bulletin2018，63，1： | 7 |
| 2 | Superconductivity at 36 K in gadolinium-arsenide oxides GdO_(1-x)F_xFeAs显示文摘In this paper we report the fabrication and superconducting properties of GdO1-xFxFeAs. It was found that when x is equal to 0.17, GdO0.83F0.17FeAs is a su-perconductor with the onset transition temperature Tcon ≈ 36.6 K. Resistivity anomaly near 130 K was observed for all samples up to x = 0.17, and such a phenomenon is similar to that of LaO1-xFxFeAs. Hall coefficient indicates that GdO1-xFxFeAs is conducted by electron-like charge carriers. | CHENG Peng, FANG Lei, YANG Huan, ZHU XiYu, MU Gang, LUO HuiQian, WANG ZhaoSheng & WEN HaiHu National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，6： | 6 |
| 3 | Surface morphology and electronic structure in stoichiometric superconductor CaKFe_(4)As_(4) robed by scanning tunneling microscopy/spectroscopy显示文摘CaKFe_(4)As_(4) is a new-type superconductor with a relatively high transition temperature of 35 K among stoichiometric iron-based superconductors. Based on scanning tunneling microscopy/spectroscopy, the surface morphology and electronic structure of CaKFe_(4)As_(4) single crystal were systematically investigated. The cleaved CaKFe_(4)As_(4) showed various morphologies, such as atomically resolved 1×1, 1×2, and √2×√2 lattices. By analyzing the geometrical correlations of these morphologies, the 1×1 and 1×2 lattices were identified as the original and reconstructed As layers, respectively, whereas the √2×√2 lattice was distinguished as the reconstructed alkaline-earth-metal or alkali-metal layer. The superconducting energy gap of 7.3 me V and bosonic mode of 12.7 me V were resolved in the scanning tunneling spectra. In addition, the superconducting energy gaps measured on different terminations were identical and consistent with the values obtained by bulk-sensitive techniques, indicating that the electronic structures of CaKFe_(4)As_(4) were insensitive to the surface reconstructions. Our study clarifies the relationships between complex surface reconstructions and surface terminations and preliminarily presents that there is no obvious effect of surface reconstructions on electronic states. | Xiaodong Yu Zhongxu Wei Zhanyi Zhao Tao Xie Chang Liu Ge He Qihong Chen Lei Shan Huiqian Luo Qing Huan Jie Yuan Kui Jin | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，12： | 5 |
| 4 | Stability of superconducting Nd_(0.8)Sr_(0.2)NiO_(2) thin films显示文摘The discovery of superconducting states in the nickelate thin film with infinite-layer structure has paved a new way for studying unconventional superconductivity.So far,research in this field is still very limited due to difficulties in sample preparation.Here we report the successful preparation of the superconducting state of Nd_(0.8)Sr_(0.2)NiO_(2)thin film(T_(c)=8.0-11.1 K)and study the stability of such films in the ambient environment,water,and under electrochemical conditions.Our work demonstrates that the superconducting state of Nd_(0.8)Sr_(0.2)NiO_(2)is remarkably stable,which can last for at least 47-day continuous exposure to air at 20°C and 35%relative humidity.We also show that the superconductivity disappears after being immersed in de-ionized water at room temperature for 5 h.Surprisingly,it can also survive under ionic liquid gating conditions with an applied voltage of about 4 V,which is even more stable than conventional perovskite complex oxides. | Xiang Ding Shengchun Shen Huaqian Leng Minghui Xu Yan Zhao Junrui Zhao Xuelei Sui Xiaoqiang Wu Haiyan Xiao Xiaotao Zu Bing Huang Huiqian Luo Pu Yu Liang Qiao | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，6： | 2 |
| 5 | Specific-heat measurement of a residual superconducting state in the normal state of underdoped BiESr2-xLaxCuO6+6 cup rate superconductors 显示文摘 | WEN H H MU Gang LUO Huiqian | 2009 | Phys Rev Lett2009，103，： | 1 |
| 6 | Anisotropic magnetoelastic response in the magnetic Weyl semimetal Co_(3)Sn_(2)S_(2)显示文摘Co_(3)Sn_(2)S_(2) is a recently identified magnetic Weyl semimetal in Shandite compounds. Upon cooling, Co_(3)Sn_(2)S_(2) undergoes a ferromagnetic transition with c-axis polarized moments(0.3 μ_(B)/Co) around T_(C)= 175 K, followed by another magnetic anomaly around T_(A)≈ 140 K. A large intrinsic anomalous Hall effect is observed in the magnetic state below TC with a maximum of anomalous Hall angle near T_(A). Here, we report an elastic neutron scattering on the crystalline lattice of Co_(3)Sn_(2)S_(2) in a magnetic field up to 10 T. A strongly anisotropic magnetoelastic response is observed, while only a slight enhancement of the Bragg peaks is observed when B//c. The in-plane magnetic field(B//ab) dramatically suppresses the Bragg peak intensity probably by tilting the moments and lattice toward the external field direction. The in-plane magnetoelastic response commences from T_(C), and as it is further strengthened below T_(A), it becomes nonmonotonic against the field between T_(A) and T_(C) because of the competition from another in-plane magnetic order. These results suggest that a magnetic field can be employed to tune the Co_(3)Sn_(2)S_(2) lattice and its related topological states. | Chang Liu ChangJiang Yi XingYu Wang JianLei Shen Tao Xie Lin Yang Tom Fenne Uwe Stuhr ShiLiang Li HongMing Weng YouGuo Shi EnKe Liu HuiQian Luo | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，5： | 0 |
| 7 | Planckian dissipation and non-Ginzburg-Landau type upper critical field in Bi2201显示文摘Resistivity and Hall effect measurements have been carried out on a micro-fabricated bridge of Bi2201 single crystal at low temperatures down to 0.4 K under high magnetic fields.When superconductivity is crashed by a high magnetic field,the recovered 'normal state' resistivity still shows a linear temperature dependence in the low temperature region.Combining with the effective mass and the charge carrier density,we get a linear scattering rate 1/τ=αkBT/h with 0.77 <α <1.16,which gives a strong evidence of the Planckian dissipation.Furthermore,our results reveal a new type of temperature dependence of the upper critical field,H_(c2)(T)=H*■,which is totally different from the expectation of the Ginzburg-Landau theory,and suggests the existence of uncondensed Cooper pairs above H_(c2)(T) line. | Qihao Zang Zhengyan Zhu Zuyu Xu Shichao Qi Haoran Ji Yiwen Li Jian Wang Huiqian Luo Hua-Bing Wang Hai-Hu Wen | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，3： | 0 |
| 8 | Characterization of nanometer tungsten powders显示文摘钨粉末的三种类型被三先锋粉末的氢减小在低温度准备,它被用作样品,并且然后被 Brunauer-Emmer-Teller (赌注)方法描绘,扫描电子显微镜学( SEM ),传播电子显微镜学( TEM ),散布的小角度X光检查(萨克斯风管),和分别地扫描电子显微镜学( FESEM )的地排放。结果证明尽管赌, SEM 不能描绘纳米粉末的粒子尺寸,他们是帮助的重要工具排除非纳米粉末。TEM 和 FESEM 能直接测量纳米粉末的粒子尺寸,但是这需要很多时间,到计数平均粒子尺寸和粒子尺寸分发。萨克斯风管不能描述凝块的状态。由 FESEM 和萨克斯风管的联合,纳米的粒子尺寸,粒子尺寸分发,和粒子形状搽粉能精确被描绘。 | LI Huiqian LIN Tao SHAO Huiping WU Chengyi GUO Zhimeng LUO Ji | 2008 | Rare Metals2008，27，2： | 0 |
| 9 | Polarized Neutron Scattering Reveals Preferred Spin Excitations in the Bilayer Iron-Based Superconductor CaK(Fe_(0.96)Ni_(0.04))_(4)As_(4)显示文摘In unconventional superconductors,the major challenge on the mechanism research is to reveal how the electrons form Cooper pairs and collectively condense to a superconducting state under both interactions from charge and spin.The ironbased superconductors are similar to those copper oxide and heavy fermion superconductors;they also exhibit strong spin fluctuations,which likely promote the superconducting pairing by acting as the bosonic“pairing glue”.Such argument is supported by a spin resonance mode with a peak energy universally linear scaling with Tc.However,it is still unknown whether in such multi-orbital systems the spin system may have some preferred fluctuating directions that is coupled to the orbital degree of freedom. | LUO Huiqian | 2022 | Bulletin of the Chinese Academy of Sciences2022，36，2： | 0 |
| 10 | Spin excitations and spin wave gap in the ferromagnetic Weyl semimetal Co3Sn2S2显示文摘We report a comprehensive neutron scattering study on the spin excitations in the magnetic Weyl semimetal Co3Sn2S2 with a quasi-two-dimensional structure.Both in-plane and out-of-plane dispersions of the spin waves were revealed in the ferromagnetic state.Similarly,dispersive but damped spin excitations were found in the paramagnetic state.The effective exchange interactions were estimated using a semi-classical Heisenberg model to consistently reproduce the experimental TCand spin stiffness.However,a full spin wave gap below Eg=2.3 meV was observed at T=4 K.This value was considerably larger than the estimated magnetic anisotropy energy(~0.6 meV),and its temperature dependence indicated a significant contribution from the Weyl fermions.These results suggest that Co3Sn2S2 is a three-dimensional correlated system with a large spin stiffness,and the low-energy spin dynamics can interplay with the topological electron states. | Chang Liu JianLei Shen JiaCheng Gao ChangJiang Yi Di Liu Tao Xie Lin Yang Sergey Danilkin GuoChu Deng WenHong Wang ShiLiang Li YouGuo Shi HongMing Weng EnKe Liu HuiQian Luo | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，1： | 0 |
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