Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-09-11
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Submitted to Physical review Letters
Scientific paper
10.1103/PhysRevLett.86.480
We have studied niobium superconducting thin wires deposited onto a SrTiO$_{3}$ substrate. By measuring the reflection coefficient of the wires, resonances are observed in the superconducting state in the 130 MHz to 4 GHz range. They are interpreted as standing wave resonances of one-dimensional plasma modes propagating along the superconducting wire. The experimental dispersion law, $\omega$ versus $q$, presents a linear dependence over the entire wave vector range. The modes are softened as the temperature increases close the superconducting transition temperature. Very good agreement are observed between our data and the dispersion relation predicted by Kulik and Mooij and Sch\"on.
Balestro Franck
Buisson Olivier
Camarota Benedetta
Delsing Per
Parage F.
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