Pracht, Uwe S. and Scheffler, Marc and Dressel, Martin and Kalok, David F. and Strunk, Christoph and Baturina, Tatyana I. (2012) Direct observation of the superconducting gap in a thin film of titanium nitride using terahertz spectroscopy. PHYSICAL REVIEW B, 86 (18): 184503. ISSN 1098-0121,
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We report on the charge carrier dynamics of superconducting titanium nitride (TiN) in the frequency range 90-510 GHz (3-17 cm(-1)). The experiments were performed on an 18-nm thick TiN film with a critical temperature of T-c = 3.4 K. Measurements were carried out from room temperature down to 2 K, and in magnetic fields up to B = 7 T. We extract the real and imaginary parts of the complex conductivity (sigma) over cap as a function of frequency and temperature, directly providing the superconducting energy gap 2 Delta. Further analysis yields the superconducting London penetration depth lambda(L). The findings as well as the normal-state properties strongly suggest conventional BCS superconductivity, underlined by the ratio 2 Delta(0)/k(B)T(c) = 3.44. Detailed analysis of the charge carrier dynamics of the silicon substrate is also discussed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM PHASE-TRANSITION; TIN FILMS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Christoph Strunk |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 May 2020 08:26 |
| Last Modified: | 04 May 2020 08:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/17818 |
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