83 citations · 582 across the 31 of their papers we have counts for
5 papers · 1 filter
Dissipative conductivity of a dirty superconductor with Dynes subgap states under a dc bias current up to the depairing current density
Takayuki Kubo
We study the dissipative conductivity of a dirty superconductor with a finite Dynes parameter under a dc-biased weak time-dependent field. The Usadel equation for the cur…
Field-dependent nonlinear surface resistance and its optimization by surface nano-structuring in superconductors
Takayuki Kubo, Alex Gurevich
We propose a theory of nonlinear surface resistance of a dirty superconductor in a strong radio-frequency (RF) field, taking into account magnetic and nonmagnetic impurities, finit…
Evaluation of the superconducting characteristics of multi-layer thin-film structures of NbN and SiO on pure Nb substrate
R. Katayama, H. Hayano, T. Kubo +7
In recent years, it has been pointed out that the maximum accelerating gradient of a superconducting RF cavity can be increased by coating the inner surface of the cavity with a mu…
Lower critical field measurement of NbN multilayer thin film superconductor at KEK
H. Ito, H. Hayano, T. Kubo +7
The multilayer thin film structure of the superconductor has been proposed by A. Gurevich to enhance the maximum gradient of SRF cavities. The lower critical field Hc1 at which the…
Lower Critical Field Measurement System based on Third-Harmonic Method for Superconducting RF Materials
Hayato Ito, Hitoshi Hayano, Takayuki Kubo +1
We develop a lower critical field (Hc1) measurement system using the third-harmonic response of an applied AC magnetic field from a solenoid coil positioned above a superconducting…