Homogeneous superconducting phase in TiN film : a complex impedance study

Abstract

The low frequency complex impedance of a high resistivity 92 μΩ cm and 100 nm thick TiN superconducting film has been measured via the transmission of several high sensitivity GHz microresonators, down to Tc/50. The temperature dependence of the kinetic inductance follows closely BCS local electrodynamics, with one well defined superconducting gap. This evidences the recovery of an homogeneous superconducting phase in TiN far from the disorder and composition driven transitions. Additionally, we observe a linearity between resonator quality factor and frequency temperature changes, which can be described by a two fluid model.

5 pages, 4 figures, accepted in Appl. Phys. Lett

References in corpus (11)

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• Circle fit optimization for resonator quality factor measurements: point redistribution for maximal accuracy
• Ultrahigh-inductance materials from spinodal decomposition
• From weak to strong-coupling superconductivity tuned by substrate in TiN films
• Contact-less phonon detection with massive cryogenic absorbers