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STUDY OF HIGH-TC superconducting THIN FILM

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STUDY OF HIGH-TC SUPERCONDUCTING THIN FILM

Ferromagnetic half levitation of LK-99-like synthetic samples

International Conference on Millimeter Wave and Far-Infrared Technology

作者： Liu,Lian-Bao Pen,Zi-An Ding,Ming-Qing BEIJING VACUUM ELECTRONICS RESEARCH INSTITUTE

＜正＞YBaCuO superconducting films were prepared by e-beam evaporation and chemical solution spraying *** electric resistance temperature is 88.1K and 83.4K,*** effect of oxygen in the environment is very important du... 详细信息

关键词： superconducting materials

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中国科学:物理学、力学、天文学英文版 2023年第10期66卷 114-120页

作者： Kaizhen Guo Yuan Li Shuang Jia International Center for Quantum materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center for Quantum Matter Beijing 100871China Interdisciplinary Institute of Light-Element Quantum materials Research Center for Light-Element Advanced MaterialsPeking University Beijing100871China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We successfully synthesized polycrystalline LK-99-like ceramic samples with a solid-state-sintering *** X-ray diffraction shows that the main contents are Pb_(10-x)Cu_(x)(PO_(4))_(6)O and Cu_(2)S,consistent with recent reports (arXiv:2307.12037;arXiv:2308.01192).In some small flaky fragments,we successfully observed“half levitation”atop a Nd_(2)Fe_(14)B *** magnetization measurements on such small pieces,as well as on a large piece which does not exhibit the half levitation,we show that the samples ubiquitously contain weak yet definitive soft ferromagnetic *** argue that,together with the pronounced shape anisotropy of the small fragments,the soft ferromagnetism is sufficient to explain the observed half levitation in strong vertical magnetic *** measurements do not indicate the presence of the Meissner effect,nor zero resistance,in our samples,leading us to believe that our samples do not exhibit *** precise chemical composition and the physics behind the ferromagnetic component remain outstanding questions to be addressed in future research.

关键词： superconducting materials ferromagnetism magnetization curve

Enhancement of Quantum Current in Mesoscopic Coupled Rings

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Chinese Physics Letters 2004年第11期21卷 2267-2270页

作者：嵇英华罗海梅胡菊菊刘刚 DepartmentofPhysics JiangxiNormalUniversityNanchang330027

We discuss the relationship between external magnetic field and persistent currents of three mesoscopic-coupled rings with charge discreteness. Through numerical calculation and analysis, it is found that the properties of the persistent currents depend on both external magnetic flux and coupled factors. The positive coupling between the rings will decrease the persistent currents when 0

关键词： superconducting materials

Improved Coupled Reservoir Model for Inelastic Scattering in One—Dimensional Mesoscopic Metal Rings

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维普期刊数据库

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Chinese Physics Letters 2002年第4期19卷 550-552页

作者：丁红胜陈赓华等 InstituteofPhysicsandCenterforCondensedMatterPhysics ChineseAcademyofSciencesBeijing100080

In order to strictly solve the problem of persistent current in one-dimensional mesoscopic metal rings, a model with a perfect ring coupled to an external reservoir by a four-lead junction is introduced to independently describe inelastic scattering. The junction is expressed by a 4 x 4 S-matrix, which is very similar to that used by Buttiker in sequential tunneling. Since the S-matrix is unitary, the current conservation keeps automatically. Since the quadruplet of the matrix problem can be reduced into two topologically separate doublets, it gives a simple and elegant method compared with the former description with 3 x 3 matrix.

关键词： superconducting materials

Review of some recent progress on materials science researches in China

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维普期刊数据库

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Science China Chemistry 2012年第12期55卷 2497-2502页

作者： TANG Mei GUO YingQing YUAN Jie WEI Qin SUN ShuJun ZHOU Wei ZHANG Yue materials Science&Engineering School Beihang UniversityBeijing 100191China School of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing 210037China School of Civil Engineering Southeast UniversityNanjing 210096China National Natural Science Foundation of China Beijing 100085China Beijing Institute of Aeronautics Material Beijing 100095China College of Chemistry Chemical Engineering and Materials ScienceHeilongjiang UniversityHarbin 150080China

New materials have become one of the most important and fastest-growing industries all over the *** progress in materials science and technology has produced profound influences on the national economy,daily life and national defense of our *** this paper,we review the state of the art of materials science and technology in China,with emphasis on recent research focuses and advanced technology.

关键词： nano-materials semiconductor materials superconducting materials cement ceramic alloy intelligent materials

31p NMR study of magnetic phase transitions of MnP single crystal under 2 GPa pressure

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Science China(Physics,Mechanics & Astronomy) 2016年第5期59卷 7-10页

作者： GuoZhi Fan Bo Zhao Wei Wu Ping Zheng JianLin Luo Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Quantum Matter Beijing 100190 China

Superconductivity on the border of the long-range magnetic order has been discovered in Mn P under high pressures. In order to investigate the nature of the magnetic properties adjacent to the superconducting state, we performed zero-field 31 P NMR for Mn P single crystal under ambient and hydrostatic pressure of 2 GPa, respectively. Radio frequency power level was used to determine whether NMR signal originates from a helical state or not. When 2 GPa pressure was applied, the signal from helical state exists even above 160 K, while that from the ferromagnetic phase was not observed. Our NMR results indicate that the magnetic phase which is adjacent to the superconducting state is in a helical magnetic structure.

关键词： superconducting materials magnetic phase transitions nuclear magnetic resonance MnP

superconducting Magnetic Flux Transformer at 77K

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Rare Metals 1990年第1期10卷 68-68页

作者： Ren, Hongtao Xiao, Ling He, Qing Li, Jiazhang General Research Inst for Nonferrous Metals China

superconducting Quantum Interference Device (SQUID) magnetometer is a kind of magnetic flux sensor with high sensitivity, and therefore can be used in geological prospect and biomagnetic field etc.. But the SQUID magnetometer used before has to be used at the temperature of 4.2K provided by liquid helium and thus its application is limited. Since the discovery of high Tc oxide superconductors, scientists have been trying hard to put the SQUID magnetometer into use at 77K. Recently, a new kind of high Tc superconducting magnetic flux transformer winded with one piece of BiPbSrCaCuO superconducting wire is produced. The magnetic flux transformer can be designed to be insensitive to both uniform fields and fields with a constant gradient. In this letter, the fabrication and the properties of the high Tc superconducting magnetic flux transformer is described.

关键词： Ceramic materials superconducting superconducting Devices superconducting materials Magnetic Properties