Abstract
We measure the complex conductivity σ and the surface impedance of c-axis oriented 100-nm-thick YBa2Cu3O7-δ (YBCO) thin films deposited on (100)MgO substrates (0.5 mm thick) at frequencies between 0.5 and 1.5 THz, using time-domain terahertz spectroscopy. The real part of σ decreases with increasing frequency and its value is about 2.4×105 (S/m) at 1 THz. The imaginary part of σ increases with increasing frequency and then monotonically decreases at around 750 GHz. The real part of σ of YBCO thin films increased with decreasing temperature and decreases below 60 K. The imaginary part of σ increased with decreasing temperature and the trend is enhanced below 60 K. The surface resistance of YBCO thin film is of the order of 10-1Ω and increases with increasing temperature. The surface reactance of YBCO thin film is independent of the frequency in this THz region, and its value is less than 10-3Ω at 40 K.
Original language | English |
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Pages (from-to) | 314-318 |
Number of pages | 5 |
Journal | Physica C: Superconductivity and its applications |
Volume | 362 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - Sep 1 2001 |
Externally published | Yes |
Keywords
- Complex conductivity
- Surface impedance
- Time-domain terahertz spectroscopy
- YBCO
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering