First experimental evidence of one-dimensional plasma modes in superconducting thin wires

Details First experimental evidence of one-dimensional plasma modes in superconducting thin wires First experimental evidence of one-dimensional plasma modes in superconducting thin wires

2000-09-11

arxiv.org/abs/cond-mat/0009146v1

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.

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