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Emergence of superconductivity from fully incoherent normal state in an iron-based superconductor (Ba_(0.6)K_(0.4))Fe_2As_2

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Science Bulletin 2019年第1期64卷 11-19页

作者： Jianwei Huang Lin Zhao Cong Li Qiang Gao Jing Liu Yong Hu Yu Xu Yongqing Cai Dingsong Wu Ying Ding Cheng Hu huaxue zhou Xiaoli Dong Guodong Liu Qingyan Wang Shenjin Zhang Zhimin Wang Fengfeng Zhang Feng Yang Qinjun Peng Zuyan Xu Chuangtian Chen Xingjiang zhou Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Technical Institute of Physics and Chemistry Chinese Academy of Sciences Songshan Lake Materials Laboratory Collaborative Innovation Center of Quantum Matter

In unconventional superconductors, it is generally believed that understanding the physical properties of the normal state is a pre-requisite for understanding the superconductivity mechanism. In conventional superconductors like niobium or lead, the normal state is a Fermi liquid with a well-defined Fermi surface and well-defined quasipartcles along the Fermi surface. Superconductivity is realized in this case by the Fermi surface instability in the superconducting state and the formation and condensation of the electron pairs(Cooper pairing). The high temperature cuprate superconductors, on the other hand, represent another extreme case that superconductivity can be realized in the underdoped region where there is neither well-defined Fermi surface due to the pseudogap formation nor quasiparticles near the antinodal regions in the normal state. Here we report a novel scenario that superconductivity is realized in a system with well-defined Fermi surface but without quasiparticles along the Fermi surface in the normal state.High resolution laser-based angle-resolved photoemission measurements have been performed on an optimally-doped iron-based superconductor(Ba_(0.6)K_(0.4))Fe_2As_2. We find that, while sharp superconducting coherence peaks emerge in the superconducting state on the hole-like Fermi surface sheets, no quasiparticle peak is present in the normal state. Its electronic behaviours deviate strongly from a Fermi liquid system. The superconducting gap of such a system exhibits an unusual temperature dependence that it is nearly a constant in the superconducting state and abruptly closes at Tc. These observations have provided a new platform to study unconventional superconductivity in a non-Fermi liquid system.

关键词： (Ba0.6K0.4)Fe2As2 ARPES Superconducting gap Normal state Non-Fermi liquid

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Research on Optimal Design of Campus Space Based on POE Concept: A Case Study of Anhui Xinhua College

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Journal of Landscape Research 2024年第2期16卷 15-17,24页

作者： XU huaxue ZHAO Zhiyan ZHU Rong NIU Song Department of Architecture and Landscape Design Anhui Xinhua UniversityHefeiAnhui 230088China

Through the analysis of the overall landscape,revetments and roads and plant landscape,10 evaluation factors were determined.The comprehensive evaluation model for the campus space of Anhui Xinhua University was constructed by analytic hierarchy process(AHP).The results showed that revetment safety,road convenience,plant disease resistance and campus activity space were important factors affecting the spatial form planning of campus.Through the comparative analysis of the collected data,optimization suggestions were put forward to provide a basis for the establishment of“people-oriented”campus open space system.

关键词： Post occupancy evaluation Analytic hierarchy process method Campus Space optimization

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Synthesis of large FeSe superconductor crystals via ion release/introduction and property characterization

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Chinese Physics B 2016年第7期25卷 93-96页

作者：苑冬娜黄裕龙倪顺利周花雪毛义元胡卫袁洁金魁张广铭董晓莉周放 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China

Large superconducting Fe Se crystals of（001） orientation have been prepared via a hydrothermal ion release/introduction route for the first time. The hydrothermally derived Fe Se crystals are up to 10 mm×5 mm×0.3 mm in dimension. The pure tetragonal FeSe phase has been confirmed by x-ray diffraction（XRD） and the composition determined by both inductively coupled plasma atomic emission spectroscopy（ICP-AES） and energy dispersive x-ray spectroscopy（EDX）. The superconducting transition of the Fe Se samples has been characterized by magnetic and transport measurements. The zero-temperature upper critical field H（c2） is calculated to be 13.2–16.7 T from a two-band model. The normal-state cooperative paramagnetism is found to be predominated by strong spin frustrations below the characteristic temperature T（sn）, where the Ising spin nematicity has been discerned in the FeSe superconductor crystals as reported elsewhere.

关键词： FeSe superconductor hydrothermal growth via ion release/introduction upper critical field spin frustrations

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Ultrafast Quasiparticle Dynamics and Electron-Phonon Coupling in(Li0.84Fe0.16)OHFe0.98Se

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Chinese Physics Letters 2020年第9期37卷 101-107页

作者：吴穹周花雪吴艳玲胡立立倪顺利田义超孙飞周放董晓莉赵忠贤赵继民 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

Distinctive superconducting behaviors between bulk and monolayer FeSe make it challenging to obtain a unified picture of all FeSe-based superconductors.We investigate the ultrafast quasiparticle(QP)dynamics of an intercalated superconductor(Li1-xFex)OHFe1-ySe,which is a bulk crystal but shares a similar electronic structure with single-layer FeSe on SrTiO3.We obtain the electron-phonon coupling(EPC)constant(0.22±0.04),which well bridges that of bulk FeSe crystal and single-layer FeSe on SrTiO3.Significantly,we find that such a positive correlation betweenλA1 g and superconducting Tc holds among all known FeSe-based superconductors,even in line with reported FeAs-based superconductors.Our observation indicates possible universal role of EPC in the superconductivity of all known categories of iron-based superconductors,which is a critical step towards achieving a unified superconducting mechanism for all iron-based superconductors.

关键词： particle unified crystal

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场所记忆视域下工业遗产文化空间再生设计研究

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艺术科技 2024年第6期37卷 185-187页

作者：和华雪山西师范大学美术学院山西太原030031

目的:城市化的加速推进使城市中出现了大量工业遗产。虽然国家采取了多种政策来处理这些闲置的场所,但大多只是对其进行拆除与改建,增加了建筑改建成本,也造成了一定的环境污染。如何合理化地处理工业遗产,成为亟待解决的问题。方法:文... 详细信息

目的:城市化的加速推进使城市中出现了大量工业遗产。虽然国家采取了多种政策来处理这些闲置的场所,但大多只是对其进行拆除与改建,增加了建筑改建成本,也造成了一定的环境污染。如何合理化地处理工业遗产,成为亟待解决的问题。方法:文章基于场所记忆理论,提出将已经废弃的工业遗产再生设计为全新的文化空间,并赋予场所新的意义,形成人们对场所的认同感。利用空间再生中出现的社会价值和场所记忆,对我国现有工业遗产再生设计后转变成的文化空间案例进行调研,对工业遗产再生的文化、社会、经济价值进行分析,基于场所记忆下文化空间的再生特征,掌握文化空间再生的多种价值方案。结果:分析国内成功再生为文化空间的案例可知,努力保存现有工业遗产的空间结构和场所价值,可以对城市环境再生和落后地区的发展产生积极影响。结论:工业遗产与场所记忆紧密交织,共同构成城市的历史文脉,保护和重视工业遗产再生,有助于保留与传承这些场所的记忆、历史和文化。再生场所的价值不仅体现在地区的再生上,还体现在城市的再生上,可为今后我国的城市再生设计提供一定的参考。

关键词：场所记忆工业遗产文化空间再生设计

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2型糖尿病患者下肢血管病变(PAD)程度与血清生化指标的关系研究

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糖尿病新世界 2024年第7期27卷 32-35页

作者：崔帆刘化学临沂市中医医院内分泌科山东临沂276000 山东省鲁南眼科医院综合内科山东临沂276000

目的探讨血清生化指标与2型糖尿病(Type 2 Diabetes mellitus,T2DM)下肢血管病变(Peripheral Arte-rial Disease,PAD)程度的相关性。方法回顾性选取2021年11月—2023年8月临沂市中医医院内分泌科收治的80例T2DM-PAD患者的临床资料,依据... 详细信息

目的探讨血清生化指标与2型糖尿病(Type 2 Diabetes mellitus,T2DM)下肢血管病变(Peripheral Arte-rial Disease,PAD)程度的相关性。方法回顾性选取2021年11月—2023年8月临沂市中医医院内分泌科收治的80例T2DM-PAD患者的临床资料,依据PAD严重程度不同分为轻度PAD组(29例)、中度PAD组(26例)和重度PAD组(25例)。比较3组血清生化指标肌酐(Creatinine,Cr)、空腹血糖(Fasting Plasma Glucose,FPG)、总胆固醇(Total Cholesterol,TC)、糖化血红蛋白(Glycated Hemoglobin A1c,HbA1c)、高密度脂蛋白胆固醇(High Density Lipoprotein-Cholesterol,HDL-C)、甘油三酯(Triacylglyceride,TG)、低密度脂蛋白胆固醇(Low Density Lipoprotein Cholesterol,LDL-C)与缺氧诱导因子-1α(Hypoxia-Inducible Factor-1α,HIF-1α),利用Pearson相关系数分析指标与PAD程度的相关性。结果3组TC、TG、LDL-C、FPG、HbA1c、HIF-1α与HDL-C比较,差异有统计学意义(P均0.05),FPG、HbA1c与HIF-1α与PAD呈正相关(P均<0.05)。结论FPG、HIF-1α、HbA1c与T2DM患者PAD严重程度存在相关性,可以为PAD早期筛查和预防提供参考。

关键词： 2型糖尿病下肢血管病变程度血清生化指标

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Effect of Mn substitution on superconductivity in iron selenide (Li, Fe)OHFeSe single crystals

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Chinese Physics B 2018年第7期27卷 492-496页

作者：毛义元李子安周花雪马明伟柴可倪顺利刘少博田金鹏黄裕龙袁洁周放李建奇金魁董晓莉赵忠贤 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Science Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China School of Physic Beijing Institute of Technology Beijing 100081 China

We synthesize a series of Mn substituted （Li, Fe）OHFeSe superconductor single crystals via a modified ion-exchange method, with the Mn concentration z （the atomic ratio of Mn：Se） ranging from 0 to 0.07. The distribution homogeneity of the Mn element incorporated into the lattice of （Li, Fe）OHFeSe is checked by combined measurements of high-angle- annular-dark-field （HAADF） imaging and electron energy-loss spectroscopy （EELS）. Interestingly, we find that the superconducting transition temperature Tc and unit cell parameter c of the Mn-doped （Li, Fe）OHFeSe samples display similar V-shaped evolutions with the increasing dopant concentration z. We propose that, with increasing doping level, the Mn dopant first occupies the tetrahedral sites in the （Li, Fe）OH layers before starting to substitute the Fe element in the su- perconducting FeSe layers, which accounts for the V-shaped change in cell parameter c. The observed positive correlation between the Tc and lattice parameter c, regardless of the Mn doping level z, indicates that a larger interlayer separation, or a weaker interlayer coupling, is essential for the high-Tc superconductivity in （Li, Fe）OHFeSe. This agrees with our previous observations on powder, single crystal, and film samples of （Li, Fe）OHFeSe superconductors.

关键词： FeSe-based superconductors Mn doping effect correlation between superconductivity and interlayer separation

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基于改进灰色关联度聚类的海水质量状况评价方法研究:以大亚湾为例

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南方水产科学 2024年第1期20卷 141-150页

作者：赵连玲刘华雪饶义勇廖秀丽戴明黄洪辉中国水产科学研究院南海水产研究所/广东省渔业生态环境重点实验室广东广州510300 西安电子科技大学数学与统计学院陕西西安710071

海洋环境质量评价是开展海洋环境管理的依据,而海洋环境评价的精度取决于海洋环境的监测和评价水平。为建立科学有效的指标评价体系,准确分析目前大亚湾西部的海水质量状况,通过改进灰色关联度聚类,将其与层次聚类结合起来,在大亚湾核... 详细信息

海洋环境质量评价是开展海洋环境管理的依据,而海洋环境评价的精度取决于海洋环境的监测和评价水平。为建立科学有效的指标评价体系,准确分析目前大亚湾西部的海水质量状况,通过改进灰色关联度聚类,将其与层次聚类结合起来,在大亚湾核电海域开展了海水质量评价探索研究。结果表明,在海水质量状况相对评价中,一类站点占比20.83%,二类站点占比66.67%,三类站点占比12.5%,总体结果表现良好。将4个季节进行对比发现,平均绝对关联度为夏季(0.7479)>冬季(0.7345)>春季(0.7290)>秋季(0.7097),夏季海水质量状况相对较好,秋季表现较差。根据评价结果可将大亚湾24个站点分成3个区域,而这3个区域的划分与大亚湾周边实际生产生活状况及实地踏勘情况相符,体现了评价方法的可操作性。

关键词：大亚湾海水质量评价灰色关联度层次聚类

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HIST1H3D基因在宫颈癌中的表达及其临床意义

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实用癌症杂志 2020年第12期35卷 1969-1972页

作者：周滑雪杜丹丽叶国柳安徽省蚌埠市蚌埠医学院第一附属医院 233000

目的检测HIST1H3D基因在宫颈癌的表达情况,进一步分析HIST1H3D基因在宫颈癌组织中的表达情况与临床病理特征、盆腔转移的关系。方法应用免疫组织化学法,检测HIST1H3D基因在正常宫颈、低度宫颈上皮内病变、高度宫颈上皮内病变、宫颈癌组... 详细信息

目的检测HIST1H3D基因在宫颈癌的表达情况,进一步分析HIST1H3D基因在宫颈癌组织中的表达情况与临床病理特征、盆腔转移的关系。方法应用免疫组织化学法,检测HIST1H3D基因在正常宫颈、低度宫颈上皮内病变、高度宫颈上皮内病变、宫颈癌组织中的表达情况及差异,统计收集患者的标本及临床资料,分析HIST1H3D基因的表达与宫颈癌临床病理特征、盆腔转移的关系。结果HIST1H3D基因在宫颈癌组织中的表达显著高于正常宫颈、低度宫颈上皮内病变和高度宫颈上皮内病变中的表达,差异有统计学意义(P0.05)。结论HIST1H3D基因在宫颈癌中的表达增加,且表达量随恶性程度增加而增加,提示其过表达与宫颈癌的发生发展有一定的关系,可作为宫颈癌发生发展及淋巴转移的参考指标。

关键词： HIST1H3D基因宫颈癌免疫组化技术

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Electronic Phase Separation in Iron Selenide(Li,Fe)OHFeSe Superconductor System

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Chinese Physics Letters 2018年第5期35卷 123-128页

作者：毛义元李军黄裕龙袁洁李子安柴可马明伟倪顺利田金鹏刘少博周花雪周放李建奇张广铭金魁董晓莉赵忠贤 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 University of Chinese Academy of Sciences Beijing 100049 Key Laboratory for Vacuum Physics University of Chinese Academy of Sciences Beijing 100049 Research Institute of Superconductor Electronic Nanjing University Nanjing 210093 School of Physics Beijing Institute of Technology Beijing 100081 State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084

The phenomenon of phase separation into antiferromagnetic（AFM） and superconducting（SC） or normal-state regions has great implication for the origin of high-temperature（high-T_c） superconductivity. However, the occurrence of an intrinsic antiferromagnetism above the T_c of（Li,Fe）OHFe Se superconductor is questioned. Here we report a systematic study on a series of（Li,Fe）OHFe Se single crystal samples with T_c up to ～41 K. We observe an evident drop in the static magnetization at T_（afm）～ 125 K, in some of the SC（T_c 38 K, cell parameter c■9.27 ？） and non-SC samples. We verify that this AFM signal is intrinsic to（Li,Fe）OHFe Se. Thus, our observations indicate mesoscopic-to-macroscopic coexistence of an AFM state with the normal（below T_（afm）） or SC（below T_c） state in（Li,Fe）OHFe Se. We explain such coexistence by electronic phase separation, similar to that in high-T_c cuprates and iron arsenides. However, such an AFM signal can be absent in some other samples of（Li,Fe）OHFe Se, particularly it is never observed in the SC samples of T_c 38 K, owing to a spatial scale of the phase separation too small for the macroscopic magnetic probe. For this case, we propose a microscopic electronic phase separation. The occurrence of two-dimensional AFM spin fluctuations below nearly the same temperature as T_（afm）, reported previously for a（Li,Fe）OHFe Se（T_c ～ 42 K） single crystal, suggests that the microscopic static phase separation reaches vanishing point in high T_c（Li,Fe）OHFe Se. A complete phase diagram is thus established. Our study provides key information of the underlying physics for high-T_c superconductivity.

关键词： Li,Fe)OHFeSe Superconductor System Fe Electronic Phase Separation in Iron Selenide AFM

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