We explore the frequency-dependent relative permittivity of Ruddlesden–Popper series thin films as a function of temperature and dc electric field. Interdigitated capacitors and coplanar waveguides were used to extract the frequency response from 500 Hz to 40 GHz. At room temperature, the in-plane relative permittivities obtained for were , , and , respectively, and were independent of frequency. At low temperatures, increases and electric field tunability develops in .
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