Linlin Wei
Chinese Academy of Sciences
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Publication
Featured researches published by Linlin Wei.
Journal of the American Chemical Society | 2015
Xiaoli Dong; Huaxue Zhou; Huaixin Yang; Jie Yuan; Kui Jin; Fang Zhou; Dongna Yuan; Linlin Wei; Jianqi Li; Xinqiang Wang; Guang-Ming Zhang; Zhongxian Zhao
Previous experimental results have shown important differences between iron selenide and arsenide superconductors which seem to suggest that the high-temperature superconductivity in these two subgroups of iron-based families may arise from different electronic ground states. Here we report the complete phase diagram of a newly synthesized superconducting (SC) system, (Li1-xFex)OHFeSe, with a structure similar to that of FeAs-based superconductors. In the non-SC samples, an antiferromagnetic (AFM) spin-density-wave (SDW) transition occurs at ∼127 K. This is the first example to demonstrate such an SDW phase in an FeSe-based superconductor system. Transmission electron microscopy shows that a well-known √5×√5 iron vacancy ordered state, resulting in an AFM order at ∼500 K in AyFe2-xSe2 (A = metal ions) superconductor systems, is absent in both non-SC and SC samples, but a unique superstructure with a modulation wave vector q = (1)/2(1,1,0), identical to that seen in the SC phase of KyFe2-xSe2, is dominant in the optimal SC sample (with an SC transition temperature Tc = 40 K). Hence, we conclude that the high-Tc superconductivity in (Li1-xFex)OHFeSe stems from the similarly weak AFM fluctuations as FeAs-based superconductors, suggesting a universal physical picture for both iron selenide and arsenide superconductors.
Scientific Reports | 2015
Zhu Lin; Chenguang Mei; Linlin Wei; Zhangao Sun; Shilong Wu; Haoliang Huang; Shuhong Zhang; Chang Liu; Yang Feng; Huanfang Tian; Huaixin Yang; Jianqi Li; Yayu Wang; Guangming Zhang; Yalin Lu; Yonggang Zhao
We report the structural and superconducting properties of FeSe0.3Te0.7 (FST) thin films with different thicknesses grown on ferroelectric Pb(Mg1/3Nb2/3)0.7Ti0.3O3 substrates. It was shown that the FST films undergo biaxial tensile strains which are fully relaxed for films with thicknesses above 200 nm. Electrical transport measurements reveal that the ultrathin films exhibit an insulating behavior and superconductivity appears for thicker films with Tc saturated above 200 nm. The current-voltage curves around the superconducting transition follow the Berezinskii-Kosterlitz-Thouless (BKT) transition behavior and the resistance-temperature curves can be described by the Halperin–Nelson relation, revealing quasi-two-dimensional phase fluctuation in FST thin films. The Ginzburg number decreases with increasing film thickness indicating the decrease of the strength of thermal fluctuations. Upon applying electric field to the heterostructure, Tc of FST thin film increases due to the reduction of the tensile strain in FST. This work sheds light on the superconductivity, strain effect as well as electric-field modulation of superconductivity in FST films.
Chinese Physics Letters | 2017
Kai Sun; Shuaishuai Sun; Linlin Wei; Cong Guo; Huanfang Tian; Genfu Chen; Huaixin Yang; Jianqi Li
Weyl semimetal (WSM) is expected to be an ideal spintronic material owing to its spin currents carried by the bulk and surface states with spin-momentum locking. The generation of a sizable photocurrent is predicted in non-centrosymmetric WSM arising from the broken inversion symmetry and the linear energy dispersion that is unique to Weyl systems. In our recent measurements, the circular photogalvanic effect (CPGE) is discovered in the TaAs WSM. The CPGE voltage is proportional to the helicity of the incident light, reversing direction if the radiation helicity changes handedness, a periodical oscillation therefore appears following the alteration of light polarization. We herein attribute the CPGE to the asymmetric optical excitation of the Weyl cone, which could result in an asymmetric distribution of photoexcited carriers in momentum space according to an optical spin-related selection rule.
Structural Dynamics | 2017
Linlin Wei; Shuaishuai Sun; Cong Guo; Zhongwen Li; Kai Sun; Yu Liu; Wenjian Lu; Yuping Sun; Huanfang Tian; Huaixin Yang; Jianqi Li
Anisotropic lattice movements due to the difference between intralayer and interlayer bonding are observed in the layered transition-metal dichalcogenide 1T-TaSeTe following femtosecond laser pulse excitation. Our ultrafast electron diffraction investigations using 4D-transmission electron microscopy (4D-TEM) clearly reveal that the intensity of Bragg reflection spots often changes remarkably due to the dynamic diffraction effects and anisotropic lattice movement. Importantly, the temporal diffracted intensity from a specific crystallographic plane depends on the deviation parameter s, which is commonly used in the theoretical study of diffraction intensity. Herein, we report on lattice thermalization and structural oscillations in layered 1T-TaSeTe, analyzed by dynamic diffraction theory. Ultrafast alterations of satellite spots arising from the charge density wave in the present system are also briefly discussed.
EPL | 2016
Huaixin Yang; Yao Cai; Chang Ma; J. Li; Yujia Long; Gang Chen; H. F. Tian; Linlin Wei; J. Q. Li
We herein report the study of the atomic structure for a fully incommensurate CDW in LaTe2 using Cs-corrected scanning transmission electron microscopy (STEM). It is directly revealed for the first time that the atomic displacements adopt an incommensurate wave-pocket structure along each Te chain. This pocket structure has a long periodicity determined by the CDW incommensurability. We can use the sinusoidal waves as the first-order approximation to characterize the atomic motions within the pocket pattern, which can yield atomic displacements in good agreement with the theoretical model commonly used for studying CDW. These facts demonstrate that the incommensurate pocket patterns should be an essential structural nature in the CDW states and play a critical role for developing the mechanism of the CDW transitions.
Journal of Solid State Chemistry | 2015
Rongguang Zhang; Huili Yang; H. F. Tian; Gang Chen; Shijun Wu; Linlin Wei; J. Q. Li
Advanced electronic materials | 2017
Zhong Sun; Linlin Wei; Ce Feng; Peixian Miao; Meiqi Guo; Huaixin Yang; Jianqi Li; Yonggang Zhao
arXiv: Superconductivity | 2017
Jing Guo; Huixia Luo; Huaixin Yang; Linlin Wei; Honghong Wang; Wei Yi; Yazhou Zhou; Zhe Wang; Shu Cai; Shan Zhang; Xiaodong Li; Yanchun Li; Jing Liu; Ke Yang; Aiguo Li; Jianqi Li; Qi Wu; R. J. Cava; Liling Sun
Crystal Growth & Design | 2017
Cong Guo; H. F. Tian; Huaixin Yang; Kai Sun; Linlin Wei; Guofu Chen; J. Q. Li
Bulletin of the American Physical Society | 2017
Chenguang Mei; Zhu Lin; Linlin Wei; Zhangao Sun; Shilong Wu; Haoliang Huang; Shu Zhang; Chang Liu; Yang Feng; Huanfang Tian; Huaixin Yang; Jianqi Li; Yayu Wang; Guang-Ming Zhang; Yalin Lu; Yonggang Zhao