236 citations · 461 across the 19 of their papers we have counts for
7 papers · 1 filter
Efficient electronic cooling above 2 K by niobium-based superconducting tunnel junctions
J. Hätinen, A. Ronzani, R. P. Loreto +15
Replacing the bulky cryoliquid-based cooling stages of cryoenabled instruments by chip-scale refrigeration is envisioned to disruptively reduce the system size similar to microproc…
Effect of ion irradiation on superconducting thin films
Katja Kohopää, Alberto Ronzani, Robab Najafi Jabdaraghi +8
We demonstrate ion irradiation by argon or gallium as a wafer-scale post-processing method to increase disorder in superconducting thin films. We study several widely used supercon…
Cascaded superconducting junction refrigerators: optimization and performance limits
A. Kemppinen, A. Ronzani, E. Mykkänen +3
We demonstrate highly transparent silicon-vanadium and silicon-aluminum tunnel junctions with relatively low sub-gap leakage current and discuss how a trade-off typically encounter…
Utilization of the Superconducting Transition for Characterizing Low-Quality-Factor Superconducting Resonators
Yu-Cheng Chang, Bayan Karimi, Jorden Senior +5
Characterizing superconducting microwave resonators with highly dissipative elements is a technical challenge, but a requirement for implementing and understanding the operation of…
Josephson photodetectors via temperature-to-phase conversion
P. Virtanen, A. Ronzani, F. Giazotto
We theoretically investigate the temperature-to-phase conversion (TPC) process occurring in dc superconducting quantum interferometers based on superconductor--normal metal--superc…
Phase-driven collapse of the Cooper condensate in a nanosized superconductor
Alberto Ronzani, Carles Altimiras, Sophie D'Ambrosio +2
Superconductivity can be understood in terms of a phase transition from an uncorrelated electron gas to a condensate of Cooper pairs in which the relative phases of the constituent…
Spectral characteristics of a fully-superconducting SQUIPT
P. Virtanen, A. Ronzani, F. Giazotto
We consider properties of a fully superconducting variant of the superconducting quantum interference proximity transistor magnetic flux sensor. We study the density of states in a…