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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Okabe, T. Shimoyama, J. Shigemori, M. Horii, S. Kishio, K. |
| Copyright Year | 2002 |
| Abstract | Local J/sub c/ distribution under H /spl par/ c was carefully investigated for lightly Pb-doped Bi2212 single crystals having uniform microstructure in order to clarify essential effect of Pb-doping on intra-grain J/sub c/ properties. An abrupt change of internal field gradient was observed at a constant field, H/sup */, for each Bi(Pb)2212 single crystal below 25 K. J/sub c/ is apparently higher above H/sup */. The H/sup */ was observed at several hundred Oe which was much lower than the second peak field, H/sub pk/, in the magnetization hysteresis loops. This suggested that dimensionality of vortex changed at H/sup */ from 3D to quasi-2D state with an increase of internal magnetic field, possibly due to an inhomogeneous distribution of lead ions in the crystal. Higher J/sub c/ above H/sup */ and temperature dependent H/sub pk/ indicated generation of field-induced pinning sites in the present system. Doping effects of cobalt for heavily Pb-doped Bi2212 single crystals on the flux pinning properties were also studied. In-plane J/sub c/ was found to become isotropic with increasing the Co-doping level. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 3759 |
| Ending Page | 3762 |
| Page Count | 4 |
| File Size | 551003 |
| File Format | |
| ISSN | 10518223 |
| Volume Number | 13 |
| Issue Number | 2 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2003-06-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Magnetic properties Crystal microstructure Magnetic flux Optical vortices Magnetic field measurement Magnetization Magnetic hysteresis Magnetic fields Temperature dependence Doping |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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