41 citations · 142 across the 7 of their papers we have counts for
7 papers
Sub-micron normal-metal/insulator/superconductor tunnel junction thermometer and cooler using Nb
M. R. Nevala, S. Chaudhuri, J. Halkosaari +2
We have successfully fabricated Cu/AlOx-Al/Nb normal-metal/insulator/superconductor tunnel junction devices with a high value of the superconducting gap (up to mV), using…
Temperature Profile for Ballistic and Diffusive Phonon Transport in a Suspended Membrane with a Radial Symmetric Heat Source
J. T. Karvonen, T. Kühn, I. J. Maasilta
We have calculated the temperature profiles for phonon heat transport in a suspended membrane with a radially symmetric heat source in the two extreme cases of either fully ballist…
Influence of Phonon dimensionality on Electron Energy Relaxation
J. T. Karvonen, I. J. Maasilta
We studied experimentally the role of phonon dimensionality on electron-phonon (e-p) interaction in thin copper wires evaporated either on suspended silicon nitride membranes or on…
Influence of temperature gradients on tunnel junction thermometry below 1 K: cooling and electron-phonon coupling
J. T. Karvonen, L. J. Taskinen, I. J. Maasilta
We have studied thermal gradients in thin Cu and AlMn wires, both experimentally and theoretically. In the experiments, the wires were Joule heated non-uniformly at sub-Kelvin temp…
Direct measurement of the electron-phonon relaxation rate in thin copper films
L. J. Taskinen, J. M. Kivioja, J. T. Karvonen +1
We have used normal metal-insulator-superconductor (NIS) tunnel junction pairs, known as SINIS structures, for ultrasensitive thermometry at sub-Kelvin temperatures. With the help…
Electron-phonon interaction in thin copper and gold films
J. T. Karvonen, L. J. Taskinen, I. J. Maasilta
We have studied the electron-phonon (e-p) interaction in thin Cu and Au films at sub-Kelvin temperatures with the help of the hot electron effect, using symmetric normal metal-insu…