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The Japan Society of Applied Physics

Nonlinearity in superconducting kinetic inductance of single-crystal NbTiN thin film

Masanori Takeda

Published Feb 6, 2015• 0 citations
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Applied Physics Express•Jun 18, 2009•68 citations
We have developed a kinetic inductance travelling-wave amplifier toward the THz-band operation. In this paper, we discuss the nonlinear kinetic inductance of single-crystal niobium titanium nitride (NbTiN) thin film in response to the application of current to the film. In our calculation, it is found that single-crystal NbTiN films have a large current variation in the kinetic inductance compared with that of polycrystalline NbTiN films. To evaluate the nonlinearity, we fabricated a superconducting coplanar waveguide with a 0.2-m line length and measured the transmittance. We observed a variation of the electrical length of the line caused by the modulation of the kinetic inductance as a function of the value of the current applied to the strip.
We report on the development of superconducting nanowire single photon detectors (SNSPDs) by using NbTiN thin films on single crystal MgO substrates. NbTiN thin films showed fine crystal structure with closer lattice constant to MgO substrates than that of NbN thin films. The transition temperature of 3.5-nm-thick NbTiN films was comparable to, and the resistivity at 20 K was lower than NbN thin films. The kinetic inductance of NbTiN-SNSPDs was ∼25% lower than that of NbN-SNSPD, and system detection efficiency was 1.4% at a 1550 nm wavelength, which is comparable to NbN-SNSPDs.