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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Booth, J.C. Sang Young Lee Leong, K.T. Lee, J.H. Lim, J. Lee, H.N. Moon, S.H. Oh, B. |
| Copyright Year | 2002 |
| Abstract | We have measured the temperature dependence of the microwave surface impedance and the nonlinear response of high-quality MgB/sub 2/ films on c-cut sapphire at temperatures below 40 K. MgB/sub 2/ films with surface resistance (R/sub s/) as low as 0.02 m/spl Omega/ at 8 K and 8.5 GHz were prepared in an ex-situ process by annealing a boron layer in magnesium-rich environment. The nonlinear properties of the MgB/sub 2/ films were investigated as a function of temperature by means of higher-order harmonic-generation measurements in patterned coplanar waveguide devices. We find that the nonlinear responses of devices fabricated from MgB/sub 2/ films were substantially higher than the nonlinear responses of similar devices fabricated from YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// thin films at the same reduced temperature. We also compared the nonlinear responses of surface ion-milled MgB/sub 2/ films with as-grown films and found that the ion-milled films gave lower nonlinear responses at temperatures below 24 K. The consequences of these measurements for passive microwave device applications of MgB/sub 2/ films are also discussed. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 3590 |
| Ending Page | 3593 |
| Page Count | 4 |
| File Size | 260616 |
| 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 | Surface impedance Surface resistance Microwave measurements Temperature dependence Electrical resistance measurement Impedance measurement Temperature measurement Annealing Boron Coplanar waveguides |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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