Values of critieal eurrent densityJ。exceeding lo6A·em一2 at 77K and zerofield have been rePorted for thinmagnetlcfllnls ofYBaoCu:O,on sinZle ervstal substrates ofSrTIO:〔l一3)and一MgO(4,5)by manvfeseafCnerS.bllt...Values of critieal eurrent densityJ。exceeding lo6A·em一2 at 77K and zerofield have been rePorted for thinmagnetlcfllnls ofYBaoCu:O,on sinZle ervstal substrates ofSrTIO:〔l一3)and一MgO(4,5)by manvfeseafCnerS.bllt tne rCSUltS OIJ、)IU一A’cm一IorY廿tU Illms on suoslrale 01 slngleerystal ZrO:(100)have not been found out inPublished PaPers 50 far.Owing to themierostrueture eharacters and highJ。ofYBCO films by contrast with bulk it 15 themost Possible to aPPly the fllms to eleetronicfield first.Therefore it 15 more signifieant toimProve values ofjcsubstrate with betterPIOCeSSJc>展开更多
The irradiation effect of slow neutrons at low fluence on high-T_c super-conductors and its mechanism are presented.Based on an analysis and comparison of irra-diation effects by fast and slow neutrons from the viewpo...The irradiation effect of slow neutrons at low fluence on high-T_c super-conductors and its mechanism are presented.Based on an analysis and comparison of irra-diation effects by fast and slow neutrons from the viewpoint of nuclear physics,a novelmechanism in great contrast to that by fast neutron irradiation is proposed.It was bothexperimentally and theoretically shown that slow neutrons of low fluence and fast neutronsof high fluence have the similar irradiation effects on high-T_c superconductors.展开更多
Ⅰ. INTRODUCTIONWith the T_c higher than that of Y-system superconductors, Bi-system superconductors are important materials to make the high-T_c superconducting wire. So reseachers in this field are interested in Bi ...Ⅰ. INTRODUCTIONWith the T_c higher than that of Y-system superconductors, Bi-system superconductors are important materials to make the high-T_c superconducting wire. So reseachers in this field are interested in Bi systems. Considerable amount of NQR and NMR studies about nuclei Cu, Y, and O in YBaCuO have been reported. A lot of structure and relaxation in-展开更多
In this special issue, we present to the readers the current experimental results in theresearch of materials processing, superconducting properties, and industrialapplications. The invited authors in this special iss...In this special issue, we present to the readers the current experimental results in theresearch of materials processing, superconducting properties, and industrialapplications. The invited authors in this special issue are prominent researchers in thesuperconductivity community. The readers will be able to find this special issuevaluable and current information in several key areas including thin films, largedomain growth, flux pinning, coated conductors, and MgBsynthesis.展开更多
Since the discovery of A15 metallic superconductors, the possible mechanism responsible for the high transition temperatures has been a. central problem. The advent of high-T_c oxides such as Y-Ba-Cu-O, Bi-Sr-Ca-Cu-O ...Since the discovery of A15 metallic superconductors, the possible mechanism responsible for the high transition temperatures has been a. central problem. The advent of high-T_c oxides such as Y-Ba-Cu-O, Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O has rendered this question even more interesting. In order to study the origin of superconductivity, it is useful to find展开更多
Ⅰ. INTRODUCTIONWe have known that the addition of Pb to BiSrCaCuO superconductors enhances high-T_c phase (i.e., 2223 phase, c=37, T_c≈110K)formation and that zero resistance at 132 K has been observed in BiPbSbSrCa...Ⅰ. INTRODUCTIONWe have known that the addition of Pb to BiSrCaCuO superconductors enhances high-T_c phase (i.e., 2223 phase, c=37, T_c≈110K)formation and that zero resistance at 132 K has been observed in BiPbSbSrCaCuO system. It is desirable to study doping other elements to the Bi-system with the variation of the nominal atomic ratio of展开更多
Iron-based superconductors include pnictides and chalcogenides.So far,the chalcogenides are much fewer in number[1],thus it is particularly valuable to find new superconductors in iron chalcogenides,for the'ultima...Iron-based superconductors include pnictides and chalcogenides.So far,the chalcogenides are much fewer in number[1],thus it is particularly valuable to find new superconductors in iron chalcogenides,for the'ultimate'understanding of iron-based superconductivity.The tetragonal binary iron selenide(β-Fe1+δSe)is the structurally simplest iron-based superconductor with a superconducting critical temperature(Tc)of 8.5 K at ambient pressure[2].By intercalation of alkali metal ions into展开更多
With the support by the National Natural Science Foundation of China and the Ministry of Science and Technology of China,a collaborative study led by Prof.Cheng Jinguang(程金光)from the Institute of Physics,Chinese Ac...With the support by the National Natural Science Foundation of China and the Ministry of Science and Technology of China,a collaborative study led by Prof.Cheng Jinguang(程金光)from the Institute of Physics,Chinese Academy of Sciences found evidence for the presence of hole pockets and the enhanced spin fluctuations in the pressure-induced high-Tcsuperconductivity phase of FeSe,which was published展开更多
0 Introduction In recent years, the study of Y-Ba-Cu-O superconductor have made much progress. The superconducting applications are showing bright future. Generally, critical current is very lower (especially bulk sam...0 Introduction In recent years, the study of Y-Ba-Cu-O superconductor have made much progress. The superconducting applications are showing bright future. Generally, critical current is very lower (especially bulk sample ). The Largest J_c is only 10~3 A/cm^2. Ordinarilly, the typical critical current of Nb-Ti alloy is 10~6 A/cm^2 about 4.2 K. Hence, the level of current density have become a problem interested in by scientists. In this paper, microstrueture of Y_1 Ba_2 Cu_2 O_(7-8) superconductor is examined. The grade intersection-tunnel modal is put forward here. Some mecha-展开更多
文摘Values of critieal eurrent densityJ。exceeding lo6A·em一2 at 77K and zerofield have been rePorted for thinmagnetlcfllnls ofYBaoCu:O,on sinZle ervstal substrates ofSrTIO:〔l一3)and一MgO(4,5)by manvfeseafCnerS.bllt tne rCSUltS OIJ、)IU一A’cm一IorY廿tU Illms on suoslrale 01 slngleerystal ZrO:(100)have not been found out inPublished PaPers 50 far.Owing to themierostrueture eharacters and highJ。ofYBCO films by contrast with bulk it 15 themost Possible to aPPly the fllms to eleetronicfield first.Therefore it 15 more signifieant toimProve values ofjcsubstrate with betterPIOCeSSJc>
基金Project supported by the National Center for Research and Development on Superconductivity of China and the Foundation for Doctoral Education.
文摘The irradiation effect of slow neutrons at low fluence on high-T_c super-conductors and its mechanism are presented.Based on an analysis and comparison of irra-diation effects by fast and slow neutrons from the viewpoint of nuclear physics,a novelmechanism in great contrast to that by fast neutron irradiation is proposed.It was bothexperimentally and theoretically shown that slow neutrons of low fluence and fast neutronsof high fluence have the similar irradiation effects on high-T_c superconductors.
基金Project supported by the Chinese National Center for United Research and Development on Superconductivity
文摘Ⅰ. INTRODUCTIONWith the T_c higher than that of Y-system superconductors, Bi-system superconductors are important materials to make the high-T_c superconducting wire. So reseachers in this field are interested in Bi systems. Considerable amount of NQR and NMR studies about nuclei Cu, Y, and O in YBaCuO have been reported. A lot of structure and relaxation in-
文摘In this special issue, we present to the readers the current experimental results in theresearch of materials processing, superconducting properties, and industrialapplications. The invited authors in this special issue are prominent researchers in thesuperconductivity community. The readers will be able to find this special issuevaluable and current information in several key areas including thin films, largedomain growth, flux pinning, coated conductors, and MgBsynthesis.
基金This work was supported by the National Center for Research and Development on Superconductivity of China.
文摘Since the discovery of A15 metallic superconductors, the possible mechanism responsible for the high transition temperatures has been a. central problem. The advent of high-T_c oxides such as Y-Ba-Cu-O, Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O has rendered this question even more interesting. In order to study the origin of superconductivity, it is useful to find
文摘Ⅰ. INTRODUCTIONWe have known that the addition of Pb to BiSrCaCuO superconductors enhances high-T_c phase (i.e., 2223 phase, c=37, T_c≈110K)formation and that zero resistance at 132 K has been observed in BiPbSbSrCaCuO system. It is desirable to study doping other elements to the Bi-system with the variation of the nominal atomic ratio of
文摘Iron-based superconductors include pnictides and chalcogenides.So far,the chalcogenides are much fewer in number[1],thus it is particularly valuable to find new superconductors in iron chalcogenides,for the'ultimate'understanding of iron-based superconductivity.The tetragonal binary iron selenide(β-Fe1+δSe)is the structurally simplest iron-based superconductor with a superconducting critical temperature(Tc)of 8.5 K at ambient pressure[2].By intercalation of alkali metal ions into
文摘With the support by the National Natural Science Foundation of China and the Ministry of Science and Technology of China,a collaborative study led by Prof.Cheng Jinguang(程金光)from the Institute of Physics,Chinese Academy of Sciences found evidence for the presence of hole pockets and the enhanced spin fluctuations in the pressure-induced high-Tcsuperconductivity phase of FeSe,which was published
文摘0 Introduction In recent years, the study of Y-Ba-Cu-O superconductor have made much progress. The superconducting applications are showing bright future. Generally, critical current is very lower (especially bulk sample ). The Largest J_c is only 10~3 A/cm^2. Ordinarilly, the typical critical current of Nb-Ti alloy is 10~6 A/cm^2 about 4.2 K. Hence, the level of current density have become a problem interested in by scientists. In this paper, microstrueture of Y_1 Ba_2 Cu_2 O_(7-8) superconductor is examined. The grade intersection-tunnel modal is put forward here. Some mecha-
