From the 1 of 6 linked papers with an AI index.
6 papers
Microscopic theory of the field-induced instability of the vortex-free state in superconducting thin-film strips
Takayuki Kubo
In the Pearl--London theory, the edge-barrier-disappearance field of a superconducting thin-film strip depends on an arbitrary short-distance core cutoff because the vortex is trea…
Microscopic equivalence of the vortex-entry current and the depairing current in a superconducting thin-film strip
Takayuki Kubo
The paper reformulates the onset of vortex entry in a superconducting thin‑film strip using microscopic Usadel theory and shows that the current at which the edge barrier disappear…
Microscopic theory of the lower critical field in superconducting thin-film strips
Takayuki Kubo
The lower critical field \(B_{c1}\) of a narrow superconducting thin-film strip sets the thermodynamic scale for vortex-free operation in a perpendicular magnetic field. The standa…
Superheating field of clean superconductors near the type-I--type-II boundary: the low-temperature Meissner stability limit of niobium
Takayuki Kubo
We calculate the low-temperature superheating field of clean superconductors near the boundary between type-I and type-II superconductivity, with particular emphasis o…
Power attenuation in millimeter-wave and terahertz superconducting rectangular waveguides: linear response, TLS loss, and Higgs-mode nonlinearity
Takayuki Kubo
Superconducting waveguides are a promising platform for ultralow-loss transmission in the millimeter-wave to terahertz band under cryogenic conditions, with potential applications…
Higgs-mode-induced instability and kinetic inductance in strongly dc-biased dirty-limit superconductors
Takayuki Kubo
A perturbative ac field superposed on a dc bias () is known to excite the Higgs mode in superconductors. The dirty limit, where disorder enhances the Higgs resonance, provides…