We report development and measurement of a micro-fabricated compacthigh-temperature superconducting (HTS) metamaterial atom operating at afrequency as low as $\sim$ 53MHz. The device is a planar spiral resonatorpatterned out of a {YBa$_2$Cu$_3$O$_{7-\delta}$} (YBCO) thin film with thecharacteristic dimension of $\sim \lambda_0/1000$, where $\lambda_0$ is thefree-space wavelength of the fundamental resonance. While deployment of an HTSmaterial enables higher operating temperatures and greater tunability, it hasnot compromised the quality of our spiral metamaterial atom and a Q as high as$\sim 1000$ for the fundamental mode, and $\sim 30000$ for higher order modes,are achieved up to 70K. Moreover, we have experimentally studied the effect ofthe substrate by comparing the performance of similar devices on differentsubstrates.
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