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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Mawatari, Y. Yamasaki, H. Nakagawa, Y. |
| Copyright Year | 2002 |
| Abstract | We have theoretically investigated third-harmonic voltage detected in a widely-used inductive measurement of critical current density J/sub c/ in superconducting films. In the inductive measurement, an ac drive current I/sub 0/ cos /spl omega/t flows in a small coil close to the surface of a superconducting film, and third-harmonic voltage V/sub 3/ cos(3/spl omega/t + /spl theta//sub 3/) induced in the coil is detected. The relationships among the ac drive current I/sub 0/, the amplitude V/sub 3/, and the phase /spl theta//sub 3/ of the third-harmonic voltage are derived on the bases of the critical state model. When the drive current is smaller than a threshold value I/sub c0/, the third-harmonic voltage is near zero, V/sub 3/ /spl ap/ 0 for I/sub 0/ < I/sub c0/. For I/sub 0/ > I/sub c0/, on the other hand, the third-harmonic voltage is expressed as V/sub 3/ exp(-i/spl theta//sub 3/) = /spl omega/I/sub c0/ G/sub 3/(I/sub 0//I/sub c0/), where G/sub 3/(/spl gamma/) is a scaling function determined by the configuration of the coil. The predicted scaling law of V/sub 3//I/sub c0/ and /spl theta//sub 3/ as functions of I/sub 0//I/sub c0/ is clearly observed in an YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// film. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 3710 |
| Ending Page | 3713 |
| Page Count | 4 |
| File Size | 568564 |
| 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 | Density measurement Current measurement Voltage measurement Critical current density Superconducting films Superconducting coils Threshold voltage Magnetic fields Magnetic films Current density |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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