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We investigate the microwave electrodynamic properties of a single superconducting thin film split-ring resonator (SRR). Transmission data showed a high-Q stop band for a single Nb SRR (Q∼4.5×104 at 4.2K) below Tc, and no such feature for a Cu SRR or closed Nb loops. Adding SRRs increased the bandwidth, but decreased the insertion loss of the features. Placing the Nb SRR into an array of wires produced a single, elementary negative-index passband (Q∼2.26×104 at 4.2K). Changes in the features due to the kinetic inductance were observed. Models for SRR permeability and wire dielectric response were used to fit the data.
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