Irradiation effect of low-fluence (∼108 n/cm2) slow neutrons on halogen-doped superconductors is presented in this paper. And the mechanism of the effect is also described from the viewpoint of nuclear physics for both fast and slow neutrons on high-temperature superconductors (HTSC). It is shown experimentally and theoretically that slow neutrons of low fluence has a similar irradiation effect to that of fast neutron beams with an energy En > 0.1 MeV and fluence 1016 - 1018 n/cm2. However, quite different mechanisms are involved in them: Fast neutrons transfer their energies through elastic scattering in HTSC, whereas slow neutrons give off their energies during the slow neutron capture (n, γ) reaction.

This work studies the effect and mechanism of slow neutron irradiation of low fluence (～108n/cm2) in normal resistivity of Y and Bi system and the doped high Tc superconductors. The experimental results indicate that the normal resistivity R not only follows the law that R is increasing exponentially with the enhancement of fluence φn, but also decreases greatly after irradiation of slow neutron with low fluence.

The magnetic curves of bulk Y-Ba-Cu-Sn-O have been studied in the temperature range 60-77 K and in fields up to 2.4 T. The results indicate that Jc varies with the magnetic field as a power law and decreases exponentially with temperature. The critical current density Jc can be improved by the substitution of Sn for Cu.

The effect of slow neutron irradiation at a low fluence of about 108n/cm2 on the microstructures of Bi-2223 polycrystalline samples was observed by transmission electron microscopy. By comparative study of the defect structures in a given area in one sample, we get evidence for the flux pinning enhancement by low fluence slow neutron irradiation.

This paper studies a new electron irradiation effect of the formation, movement and growth of stacking fault in YBa2Cu3O6+x. The energy of electron irradiation is about 160 keV. It would be a promising way to enhance the density of pinning centers.

Effect of slow neutron irradiation of low fluence on bismuth-based superconductors is studied. It's shown through experiments that (1) both critical current density Jc and zero-resistance temperature Tc0 are increased, though to different extents, after the Bi-based superconductors were irradiated with slow neutrons to suitable fluence and (2) slow neutrons of low fluence and fast neutrons of high fluence have similar irradiation effects on Bi-based superconductors.

Two high Tc superconductor YBa2Cu3O7-δ thin films, the zero resistance temperature of which were 82K and 71K respectively, were selected for measurement about resistance broadening. The difference in thermal activation energy of the two samples was analyzed with Arrhenius law auggested by Palstra We found that the activation energy decreased depending upon increasing magnetic field. The irreversibi-lity line was B*-(1-T*/Tc)3/2 deduced from our data.

physica status solidi (a)Volume 114, Issue 2 p. K189-K192 Short Note Effect of Neutron Irradiation on the Superconductivity of YBaCuO Jirong Jin, Jirong Jin Department of Physics, Nanjing University Search for more papers by this authorWuming Chen, Wuming Chen Department of Physics, Nanjing University Search for more papers by this authorXin Jin, Xin Jin Department of Physics, Nanjing University Search for more papers by this authorYitong Zhang, Yitong Zhang Department of Physics, Nanjing University Search for more papers by this authorMu Lu, Mu Lu Department of Physics, Nanjing University Search for more papers by this authorYubao Sheng, Yubao Sheng Department of Physics, Nanjing University Search for more papers by this authorJiaben Ji, Jiaben Ji Department of Physics, Nanjing University Search for more papers by this authorGuosheng Han, Guosheng Han Department of Physics, Nanjing University Search for more papers by this authorYi Tang, Yi Tang Department of Physics, Nanjing University Search for more papers by this authorXixian Yao, Xixian Yao Department of Physics, Nanjing University Search for more papers by this author Jirong Jin, Jirong Jin Department of Physics, Nanjing University Search for more papers by this authorWuming Chen, Wuming Chen Department of Physics, Nanjing University Search for more papers by this authorXin Jin, Xin Jin Department of Physics, Nanjing University Search for more papers by this authorYitong Zhang, Yitong Zhang Department of Physics, Nanjing University Search for more papers by this authorMu Lu, Mu Lu Department of Physics, Nanjing University Search for more papers by this authorYubao Sheng, Yubao Sheng Department of Physics, Nanjing University Search for more papers by this authorJiaben Ji, Jiaben Ji Department of Physics, Nanjing University Search for more papers by this authorGuosheng Han, Guosheng Han Department of Physics, Nanjing University Search for more papers by this authorYi Tang, Yi Tang Department of Physics, Nanjing University Search for more papers by this authorXixian Yao, Xixian Yao Department of Physics, Nanjing University Search for more papers by this author First published: 16 August 1989 https://doi.org/10.1002/pssa.2211140255Citations: 7 Nanjing, People's Republic of China. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat References 1 S. X. Wang, Q. Jian, and S. K. Liu, Physica 11, 93 (1982). 2 J. Z. Sun, D. J. Webb, M. Naito, K. Char, M. R. Hahn, J. W. P. Hsu, A. D. Kent, D. B. Mitzi, B. Oh, M. R. Beasley, T. H. Geballe, R. H. Hammond, and A. Kapitulnik, Phys. Rev. Letters 58, 1574 (1987). Citing Literature Volume114, Issue216 August 1989Pages K189-K192 ReferencesRelatedInformation