期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
A New Quasi-One-Dimensional Ternary Molybdenum Pnictide Rb2Mo3As3 with Superconducting Transition at 10.5K 被引量:2
1
作者 Kang Zhao Qing-Ge Mu +7 位作者 Bin-Bin Ruan Meng-Hu Zhou Qing-Song Yang Tong Liu Bo-Jin Pan Shuai Zhang Gen-Fu Chen Zhi-An Ren 《Chinese Physics Letters》 SCIE CAS CSCD 2020年第9期73-77,共5页
We report superconductivity in a new ternary molybdenum pnictide Rb2 Mo3 As3,synthesized via the solid state reaction method.Powder x-ray diffraction analysis reveals a hexagonal crystal structure with space group P6 ... We report superconductivity in a new ternary molybdenum pnictide Rb2 Mo3 As3,synthesized via the solid state reaction method.Powder x-ray diffraction analysis reveals a hexagonal crystal structure with space group P6 m2(No.187),and the refined lattice parameters are a=10.431(5)A,c=4.460(4)A.SEM images show rod-like grains with good ductility,confirming a quasi-one-dimensional(Q1 D)structure.Electrical resistivity and dc magnetic susceptibility characterizations exhibit superconductivity with an onset of Tc=10.5 K.The upper critical field of Rb2 Mo3 As3 is estimated to be 28.2 T at zero temperature,providing an evidence of possible unconventional superconductivity.Our recent discovery of MoAs-based superconductors above 10 K provides a unique platform for the study of exotic superconductivity in 4 d electron systems with Q1 D crystal structures. 展开更多
关键词 DUCTILITY SUPERCONDUCTIVITY Transition
在线阅读 下载PDF
Direct Microwave Synthesis of 11-Type Fe(Te,Se) Polycrystalline Superconductors with Enhanced Critical Current Density 被引量:1
2
作者 Bo-Jin Pan Kang Zhao +4 位作者 Tong Liu Bin-Bin Ruan Shuai Zhang Gen-Fu Chen Zhi-An Ren 《Chinese Physics Letters》 SCIE CAS CSCD 2019年第1期56-59,共4页
We report a direct microwave synthesis method for the preparation of 11-type high quality Fe(Te,Se) polycrystalline superconductors. The bulk samples are rapidly synthesized under the microwave irradiation during seve... We report a direct microwave synthesis method for the preparation of 11-type high quality Fe(Te,Se) polycrystalline superconductors. The bulk samples are rapidly synthesized under the microwave irradiation during several minutes, with a subsequent annealing process at 400℃. The samples exhibit a nearly single phase of the tetragonal PbO-type crystal structure with minor impurities. Morphology characterization shows high density, tight grain connectivity and large grain sizes around 100 μm with small cavities inside the sample. Resistivity and magnetization measurements both show similar superconducting transitions above 14 K. The magnetic hysteresis measurements display broad and symmetric loops without magnetic background, and a high critical current density J_c about 1.2 × 10~4 A/cm^2 at 2 K and 7 T is estimated by the Bean model. Compared with the solidstate reaction synthesized samples, these superconducting bulks from microwave-assisted synthesis are possibly free of the interstitial Fe due to smaller c-axis, higher T_c in magnetic transitions, better M–H loops without magnetic background and greatly enhanced J_c, and are promising as raw materials for the non-toxic Fe-based superconducting wires for large currents and high field applications. 展开更多
关键词 MICROWAVE Synthesis POLYCRYSTALLINE SUPERCONDUCTORS ENHANCED CRITICAL Current Density
在线阅读 下载PDF
Revisiting the Electron-Doped SmFeAsO:Enhanced Superconductivity up to 58.6 K by Th and F Codoping 被引量:1
3
作者 王小川 于佳 +6 位作者 阮彬彬 潘伯津 穆青隔 刘通 赵康 陈根富 任治安 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第7期228-231,共4页
In the iron-based high-To bulk superconductors, Tc above 50 K was only observed in the electron-doped 1111-type compounds. Here we revisit the electron-doped SmFeAsO polycrystals to make a further investigation for th... In the iron-based high-To bulk superconductors, Tc above 50 K was only observed in the electron-doped 1111-type compounds. Here we revisit the electron-doped SmFeAsO polycrystals to make a further investigation for the highest Tc in these materials. To introduce more electron carriers and less crystal lattice distortions, we study the Th and F eodoping effects into the Sm-O layers with heavy electron doping. Dozens of Sm1-xThx FeAsO1-yFy samples are synthesized through the solid state reaction method, and these samples are carefully characterized by the structural, resistive, and magnetic measurements. We find that the codoping of Th and F clearly enhances the superconducting Tc more than the Th or F single-doped samples, with the highest record Tc up to 58.6K when x = 0.2 and y=0.225. Further element doping causes more impurities and lattice distortions in the samples with a weakened superconductivity. 展开更多
关键词 TH AS Revisiting the Electron-Doped SmFeAsO:Enhanced Superconductivity up to58.6K by Th and F Codoping
在线阅读 下载PDF
硅基光电子工艺中集成锗探测器的工艺挑战与解决方法 被引量:1
4
作者 宁宁 潘伯津 +2 位作者 黄烁 杜明锋 王学毅 《数字技术与应用》 2023年第8期142-145,239,共5页
锗探测器是硅基光电子芯片中实现光电信号转化的核心器件。在硅基光电子芯片工艺中实现异质单片集成高性能锗探测器工艺,是光模块等硅基光电子产品实现小体积、低成本和易制造的优先选择。本文讨论了硅基光电子芯片集成锗探测器在实际... 锗探测器是硅基光电子芯片中实现光电信号转化的核心器件。在硅基光电子芯片工艺中实现异质单片集成高性能锗探测器工艺,是光模块等硅基光电子产品实现小体积、低成本和易制造的优先选择。本文讨论了硅基光电子芯片集成锗探测器在实际工艺中遇到的挑战和解决思路。硅基光电子芯片集成锗探测器主要挑战在于热预算兼容、金属污染防控及工艺结构的匹配三个方面。 展开更多
关键词 硅基光电子 光电信号 单片集成 工艺结构 锗探测器 光模块 芯片集成 芯片工艺
在线阅读 下载PDF
Superconductivity in Undoped CaFe_2As_2 Single Crystals
5
作者 陈东云 于佳 +7 位作者 阮彬彬 郭琦 张蕾 穆青隔 王小川 潘伯津 陈根富 任治安 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第6期128-131,共4页
Single crystals of undoped CaFe2As2 are grown by an FeAs self-flux method, and the crystals are quenched in ice-water rapidly after high-temperature growth. The quenched crystal undergoes a collapsed tetragonal struct... Single crystals of undoped CaFe2As2 are grown by an FeAs self-flux method, and the crystals are quenched in ice-water rapidly after high-temperature growth. The quenched crystal undergoes a collapsed tetragonal structural phase transition around 80 K revealed by the temperature-dependent x-ray diffraction measurements. Superconductivity below 25 K is observed in the collapsed phase by resistivity and magnetization measurements. The isothermal magnetization curve measured at 2 K indicates that this is a typical type-ll superconductor. For comparison, we systematically characterize the properties of the furnace-cooled, quenched, and post-annealed single crystals, and find strong internal crystallographic strain existing in the quenched samples, which is the key for the occurrence of superconductivity in the undoped CaFe2As2 single crystals. 展开更多
关键词 AS CA for IS of in Superconductivity in Undoped CaFe2As2 Single Crystals
在线阅读 下载PDF
Superconductivity in Sm-doped CaFe2As2 single crystals
6
作者 陈东云 阮彬彬 +7 位作者 于佳 郭琦 王小川 穆青隔 潘伯津 刘通 陈根富 任治安 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第6期59-62,共4页
In this article,the Sm-doping single crystals Ca1-xSmxFe2As2(x = 0 0.2) were prepared by the Ca As flux method,and followed by a rapid quenching treatment after the high temperature growth.The samples were character... In this article,the Sm-doping single crystals Ca1-xSmxFe2As2(x = 0 0.2) were prepared by the Ca As flux method,and followed by a rapid quenching treatment after the high temperature growth.The samples were characterized by structural,resistive,and magnetic measurements.The successful Sm-substitution was revealed by the reduction of the lattice parameter c,due to the smaller ionic radius of Sm3+than Ca2+.Superconductivity was observed in all samples with onset Tc varying from 27 K to 44 K upon Sm-doping.The coexistence of a collapsed phase transition and the superconducting transition was found for the lower Sm-doping samples.Zero resistivity and substantial superconducting volume fraction only happen in higher Sm-doping crystals with the nominal x 〉 0.10.The doping dependences of the c-axis length and onset Tc were summarized.The high-Tc observed in these quenched crystals may be attributed to simultaneous tuning of electron carriers doping and strain effect caused by lattice reduction of Sm-substitution. 展开更多
关键词 SUPERCONDUCTIVITY Sm-doping CaFe2As2 collapsed structure
在线阅读 下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部