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Direct observation of the superconducting gap in thin film of titanium nitride using terahertz spectroscopy

Pracht, U. S. ; Scheffler, M. ; Dressel, M. ; Kalok, David ; Strunk, Christoph ; Baturina, T.


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 Tc=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 ...


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