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Significantly enhanced superconductivity in monolayer FeSe films on SrTiO3（001） via metallic δ-doping

National Science Review 2024年第3期11卷 119-127页

作者： Xiaotong Jiao Wenfeng Dong Mingxia Shi Heng Wang Cui Ding Zhongxu Wei Guanming Gong Yanan Li Yuanzhao Li binjie zuo Jian Wang Ding Zhang Minghu Pan Lili Wang Qi-Kun Xue State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University School of Physics&Information Technology Shaanxi Normal University Beijing Academy of Quantum Information Sciences Department of Physics Southern University of Science and Technology International Center for Quantum Materials School of Physics Peking University Department of Physics The Pennsylvania State University Collaborative Innovation Center of Quantum Matter Hefei National Laboratory

Superconductivity transition temperature（Tc） marks the inception of a macroscopic quantum phase-coherent paired state in fermionic systems. For 2D superconductivity, the paired electrons condense into a coherent superfluid state at Tc, which is usually lower than the pairing temperature, between which intrinsic physics including Berezinskii–Kosterlitz–Thouless transition and pseudogap state are hotly debated. In the case of monolayer FeSe superconducting films on SrTiO3（001）, although the pairing temperature（Tp） is revealed to be 65–83 K by using spectroscopy characterization, the measured zero-resistance temperature（Tc0） is limited to 20 K. Here, we report significantly enhanced superconductivity in monolayer FeSe films by δ-doping of Eu or Al on SrTiO3（001） surface, in which Tc0is enhanced by 12 K with a narrowed transition width ΔTc～8 K, compared with non-doped samples. Using scanning tunneling microscopy/spectroscopy measurements, we demonstrate lowered work function of the δ-doped SrTiO3（001） surface and enlarged superconducting gaps in the monolayer FeSe with improved morphology/electronic homogeneity. Our work provides a practical route to enhance 2D superconductivity by using interface engineering.

关键词： monolayer FeSe interface superconductivity δ-doping zero-resistance temperature superconductivity transition temperature

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Carbon-emcoating architecture boosts lithium storage of Nb_(2)O_(5)

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Science China Materials 2021年第5期64卷 1071-1086页

作者： Qing Ji Zhuijun Xu Xiangwen Gao Ya-Jun Cheng Xiaoyan Wang Xiuxia zuo George Z.Chen binjie Hu Jin Zhu Peter G.Bruce Yonggao Xia Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China The University of Nottingham Ningbo China Ningbo 315100China University of Chinese Academy of Sciences Beijing 100049China Department of Materials University of OxfordParks RdOX13PHOxfordUnited Kingdom Materials Science and Engineering Program and Texas Materials Institute University of Texas at AustinAustinTX 78712USA University of Nottingham University ParkNottingham NG72RDUnited Kingdom The Henry Royce Institute Parks RoadOxford OX13PHUnited Kingdom The Faraday Institution Quad OneBecquerel AvenueHarwell CampusDidcot OX11 OR1United Kingdom Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Intercalation transition metal oxides (ITMO)have attracted great attention as lithium-ion battery negative electrodes due to high operation safety,high capacity and rapid ion ***,the intrinsic low electron conductivity plagues the lifetime and cell performance of the ITMO negative *** we design a new carbon-emcoating architecture through single CO_(2)activation treatment as demonstrated by the Nb_(2)O_(5)/C *** structure engineering of the carbon-emcoating Nb_(2)O_(5)/C nanohybrid is achieved in terms of porosity,composition,and crystallographic *** carbon-embedding Nb_(2)O_(5)/C nanohybrids show superior cycling and rate performance compared with the conventional carbon coating,with reversible capacity of 387 m A h g(-1)at 0.2 C and 92%of capacity retained after 500cycles at 1 *** electrochemical mass spectrometry(DEMS) indicates that the carbon emcoated Nb_(2)O_(5)nanohybrids present less gas evolution than commercial lithium titanate oxide during *** unique carbon-emcoating technique can be universally applied to other ITMO negative electrodes to achieve high electrochemical performance.

关键词： niobium pentoxide/carbon nanohybrids mesoporous CO_(2)activation emcoating lithium-ion battery negative electrode

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早期新型冠状病毒肺炎与普通型肺炎的临床及影像学鉴别诊断

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重庆医科大学学报 2020年第7期45卷 998-1003页

作者：付彬洁张浩游兴攀商亚军左福林江维吕发金褚志刚重庆医科大学附属第一医院放射科重庆400016 重庆市垫江县人民医院放射科重庆408300 重庆市合川区人民医院放射科重庆401520 重庆市铜梁区人民医院放射科重庆402560 重庆市长寿区人民医院放射科重庆401220 重庆医科大学附属第一医院感染科重庆400016

目的:总结早期新型冠状病毒肺炎(coronavirus disease 2019,COVID-19)与普通型肺炎的临床和影像学特征及差异,提高对两者的诊断和鉴别诊断水平。方法:回顾性收集2020年1月25日至2月16日于重庆地区确诊的37例早期COVID-19患者及重庆医科... 详细信息

目的:总结早期新型冠状病毒肺炎(coronavirus disease 2019,COVID-19)与普通型肺炎的临床和影像学特征及差异,提高对两者的诊断和鉴别诊断水平。方法:回顾性收集2020年1月25日至2月16日于重庆地区确诊的37例早期COVID-19患者及重庆医科大学附属第一医院诊断的40例早期普通型肺炎(非COVID-19)患者的临床、实验室检查和影像学资料,分析和总结两者之间各指标的差异性。结果:COVID-19与普通型肺炎患者的临床表现相似,但前者多有明确的流行病学史,且白细胞计数、中性粒细胞绝对数和C反应蛋白升高者较少见(P<0.001),而淋巴细胞绝对数降低者多见(P<0.05)。肺部CT图像上,早期COVID-19与普通型肺炎患者的病灶均以磨玻璃密度影(ground glass opacity,GGO)为主(89.2%vs.90.0%,P=1.000)。COVID-19患者的病灶主要呈圆形或半圆形(19例,51.4%),其次为小斑片状(15例,40.5%),以累及胸膜下区为主(25例,67.6%)。普通型肺炎患病灶主要呈片状GGO伴实变(21例,52.5%),其中以GGO为主(17例,81.0%),其次为单发或多发小斑片状GGO不伴实变(11例,27.5%),以累及整个肺段或亚段为主(31例,77.5%)。27例COVID-19患者和35例普通型肺炎患者不均质GGO内分别以网格影(16例,59.3%)和多发结节影(27例,77.1%)常见。与COVID-19相比,普通型肺炎病灶内支气管壁增厚更常见(42.5%vs.8.1%,P=0.001),且病变边界多较模糊(75.0%vs.45.9%,P=0.002)。结论:COVID-19与普通型肺炎患者肺部早期病灶均以GGO为主,但前者多呈圆形或小斑片状,胸膜下受累为主,其内网格影多见,边界多清晰,后者多呈片状或小斑片状,累及整个肺段或亚段为主,其内实变、结节影及支气管壁增厚多见,边界多模糊。影像结合患者临床信息及实验室检查有助于两者鉴别诊断。

关键词：新型冠状病毒新型冠状病毒肺炎 CT 鉴别诊断

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