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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Jo, W. Beasley, M.R. Hammond, R.H. |
| Copyright Year | 2002 |
| Abstract | We report transport properties of superconducting MgB/sub 2/ thin films in-situ grown by molecular beam epitaxy. The MgB/sub 2/ films show a superconducting transition at 34.5 K with /spl Delta/T/sub c/<1 K. We measure the in-plane electrical resistivity of the films in magnetic field to 8 T and estimate the upper critical field H/sub c2//sup /spl perp//(0)/spl sim/32 T for field oriented along the c-axis and H/sub c2//sup /spl par//(0)/spl sim/35 T in the plane of the film. We find the zero-temperature coherence lengths /spl xi//sub c/(0)/spl sim/31 /spl Aring/ and /spl xi//sub ab/(0)/spl sim/36 /spl Aring/, indicating the field anisotropy ratio is 1.2, comparable with reported in-situ epitaxial thin films, but less than single crystals. The calculated electronic mean free path l=25 /spl Aring/ is smaller than the coherence length, which places our films in the dirty limit. Estimates of the critical current density, J/sub c/, using magnetic field hysteresis loops and the Bean critical state model give nominal critical current densities on the order of 10/sup 6/ A/cm/sup 2/ at 15 K and self-field. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 3257 |
| Ending Page | 3260 |
| Page Count | 4 |
| File Size | 342247 |
| 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 | Anisotropic magnetoresistance Critical current density Magnetic films Superconducting epitaxial layers Superconducting films Magnetic field measurement Superconducting thin films Molecular beam epitaxial growth Electric variables measurement Electric resistance |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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