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Superconductivity in zirconium polyhydrides with T_(c) above 70 K

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Science Bulletin 2022年第9期67卷 907-909,M0003页

作者： Changling Zhang Xin He Zhiwen Li Sijia Zhang shaomin feng Xiancheng Wang Richeng Yu Changqing Jin Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Hydrogen is expected to be a metal at sufficient high pressures[1]while it can also be a high temperature superconductor based on BCS theory because of its high Debye temperature arising from the light mass of hydrogen[2].Since it is very challenging to reach the pressure for the hydrogen metallization,the “chemically precompressed” hydrogen-rich compounds were in turn proposed[3,4]to realize high temperature superconductivity at lower *** experimental discovery of high temperature superconductivity[5]in SH3 has greatly stimulated efforts to explore new hydrogen-rich superconductors,such as in rare earth polyhydrides[6,7].

关键词：高温超导超导现象高压高温激光加热金属化临界转变温度极端条件金属氢

Superconductivity with Tc of 116 K discovered in antimony polyhydrides

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National Science Review 2024年第7期11卷 21-25页

作者： Ke Lu Xin He Changling Zhang Zhiwen Li Sijia Zhang Baosen Min Jun Zhang Jianfa Zhao Luchuan Shi Yi Peng shaomin feng Qingqing Liu Jing Song Richeng Yu Xiancheng Wang Yu Wang Maxim Bykov Changqing Jin Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Songshan Lake Materials Laboratory Institute of Geosciences Goethe University Frankfurt Institute of Inorganic Chemistry University of Cologne

Superconductivity（SC） was experimentally observed for the first time in antimony polyhydride. The diamond anvil cell combined with a laser heating system was used to synthesize the antimony polyhydride sample at high pressure and high temperature. In-situ high pressure transport measurements as a function of temperature with an applied magnetic field were performed to study the SC properties. It was found that the antimony polyhydride samples show superconducting transition with critical temperature Tc116 K at 184 GPa. The investigation of SC at magnetic field revealed the superconducting coherent length of～40 ? based on the Ginzburg Landau（GL） equation. Antimony polyhydride superconductor has the second highest Tcin addition to sulfur hydride among the polyhydrides of elements from main groups IIIA to VIIA in the periodic table.

关键词： high Tc superconductor antimony polyhydrides high pressure effects

Pressure-induced shift of Tc and structural transition in “122” type pnictide superconductor Ca0.34Na0.66Fe2As2

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Pressure-induced shift of Tc and structural transition in “...

One Pot Synthesis of Cubic Gauche Polymeric Nitrogen

中国晶体学会第六届学术年会暨会员代表大会（极端条件晶体材料分会）

作者： shaomin feng Sijia Zhang Kan Zhao Changqing Jin Institute of Physics Chinese Academy of Sciences

CaFeAs is special among the 122 materials as due to its reduced unit cell volume and c lattice parameter, which is very close to collapsed tetragonal(CT) phase. So it is very sensitive to external pressure and chemical pressure(doping). Optimal Na doped(CaNa)FeAs shows a superconducting transition with T 33 K at ambient pressure. With application of pressure, T decreases nearly linearly with d T c/d P 1.7K/GPa at pressures lower than 2 GPa, and disappears gradually at higher pressure. The disappearance of superconductivity is also companied with the recovery of standard Fermi liquid behaviors of the normal-state transport properties. Moreover,(CaNa)FeAs exhibits a tetragonal(T) to collapsed-tetragonal(c T) transition at about 3 GPa. The evolution of non-Fermi liquid behaviors and superconductivity under pressure are both related to the interband fluctuations.

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CHINESE PHYSICS LETTERS 2024年第12期41卷 97-106页

作者： Chen, Runteng Zhang, Jun Wang, Zelong Lu, Ke Peng, Yi Zhao, Jianfa feng, shaomin Jin, Changqing Chinese Acad Sci Inst Phys Beijing Natl Lab Condensed Matter Phys Beijing 100190 Peoples R China Univ Chinese Acad Sci Sch Phys Beijing 100190 Peoples R China

The long sought cubic gauche polymeric nitrogen (cg-N) consisting of N-N single bonds has been synthesized by one pot route using sodium azide as a precursor at ambient conditions. The recrystallization process was designed to expose crystal faces with low activation energy that facilitates initiating the polymeric reaction at ambient conditions. The azide was considered as a precursor due to the low energy barrier in transforming double bonded N=N to single bonded cg-N. Raman spectrum measurements detected the emerging vibron peaks at 635 cm-1 for the polymerized sodium azide samples, demonstrating the formation of cg-N with N-N single bonds. Different from traditional high-pressure technique and recently developed plasma enhanced chemical vapor deposition method, the route achieves the quantitative synthesis of cg-N at ambient conditions. The one pot synthesis of cg-N offers potential for further scaling up production as well as practical applications of polymeric nitrogen based materials as high energy density materials.

关键词： materials. azide bonds

Superconductivity above 70 K observed in lutetium polyhydrides

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Science China(Physics,Mechanics & Astronomy) 2023年第6期66卷 95-100页

作者： Zhiwen Li Xin He Changling Zhang Ke Lu Baosen Min Jun Zhang Sijia Zhang Jianfa Zhao Luchuan Shi Yi Peng shaomin feng Zheng Deng Jing Song Qingqing Liu Xiancheng Wang Richeng Yu Luhong Wang Yingzhe Li Jay D.Bass Vitali Prakapenka Stella Chariton Haozhe Liu Changqing Jin Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing100190China Songshan Lake Materials Laboratory Dongguan523808China Shanghai Advanced Research in Physical Sciences Shanghai201203China Department of Geology University of Illinois at Urbana ChampaignUrbana61801USA Center for Advanced Radiations Sources University of ChicagoChicago60637USA Center for High Pressure Science&Technology Advanced Research Beijing100094China

The binary polyhydrides of heavy rare earth lutetium that shares a similar valence electron configuration to lanthanum have been experimentally discovered to be *** lutetium polyhydrides were successfully synthesized at high pressure and high temperature conditions using a diamond anvil cell in combinations with the in-situ high pressure laser heating *** resistance measurements as a function of temperature were performed at the same pressure of synthesis in order to study the transitions of superconductivity(SC).The superconducting transition with a maximum onset temperature(Tc)71 K was observed at pressure of 218 GPa in the *** Tcdecreased to 65 K when pressure was at 181 *** the evolution of SC at applied magnetic fields,the upper critical field at zero temperatureμ0Hc2(0)was obtained to be~36 *** in-situ high pressure X-ray diffraction experiments imply that the high TcSC should arise from the Lu4H23phase with Pm3n symmetry that forms a new type of hydrogen cage framework different from those reported for previous light rare earth polyhydride superconductors.

关键词： lutetium polyhydrides superconductors at high pressures high pressure synthesis

The novel semiconductors Ba9Sn3X15(X=Se and Te) with one dimensional SnX6 chains

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The novel semiconductors Ba9Sn3X15(X=Se and Te) with one dim...

“教—学—评”一体化引领下的小学英语单元整体教学设计

中国晶体学会第六届学术年会暨会员代表大会（极端条件晶体材料分会）

作者： Jun Zhang Xiancheng Wang Wenmin Li Jianfa Zhao Zheng Deng Sijia Zhang shaomin feng Qingqing Liu Changqing Jin Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Collaborative Innovation Center of Quantum Matter Beijing Computational Science Research Center

In present work, the new compounds of BaSnX(X=Se and Te) have been synthesized at high pressure and high temperature conditions. These compounds crystallize into a hexagonal structure with the space group P-6c2(188), ...

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英语教师 2022年第23期22卷 123-126页

作者：冯少民北京市通州区教师研修中心北京101100

阐述“教—学—评”一体化的内涵。结合北京版小学《英语》三年级(下)Unit 7 I want to be a teacher,探讨“教—学—评”一体化引领下的单元整体教学设计有效路径,即研读语篇内容,确定单元目标;基于单元目标,逆向设计活动;设计多元评价... 详细信息

阐述“教—学—评”一体化的内涵。结合北京版小学《英语》三年级(下)Unit 7 I want to be a teacher,探讨“教—学—评”一体化引领下的单元整体教学设计有效路径,即研读语篇内容,确定单元目标;基于单元目标,逆向设计活动;设计多元评价,促进目标达成。在此基础上,促进学生落实英语学科核心素养,达成立德树人、全人发展的课程目标。

关键词： “教—学—评”一体化小学英语单元整体教学

互文视角下小学英语教学融合语篇的实践与思考

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英语教师 2023年第8期23卷 180-183,192页

作者：冯少民北京市通州区教师研修中心北京101100

介绍互文性的概念与内涵。以北京版小学《英语》三年级(上)Unit 5 It’s a nice autumn day Lesson 16为例,探索互文视角下小学英语教学融合语篇的途径,即研读对话文本,融合多模态语篇;以语篇为依托,制订分级教学目标;关注语篇间性,探... 详细信息

介绍互文性的概念与内涵。以北京版小学《英语》三年级(上)Unit 5 It’s a nice autumn day Lesson 16为例,探索互文视角下小学英语教学融合语篇的途径,即研读对话文本,融合多模态语篇;以语篇为依托,制订分级教学目标;关注语篇间性,探究文本主题意义。总结互文视角下小学英语教学融合语篇的原则,即主题意义一致性原则、语言难度匹配性原则及语篇材料多样性原则。

关键词：互文性小学英语融合语篇

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基于主题意义探究小学英语单元整体教学策略

英语教师 2019年第22期19卷 58-61,70页

作者：冯少民北京市通州区教师研修中心

分析小学英语单元教学中存在的问题,结合北京版小学《英语》四年级(下)Unit 5 Is May Day a Holiday?的单元教学课例,从主题意义、目标递进、教学路径、输出活动四个方面探究主题意义下小学英语单元整体教学的有效策略。

关键词：主题意义小学英语单元整体教学教学策略