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We explore the frequency-dependent relative permittivity of Ruddlesden-Popperseries Sr(n+1)Ti(n)O(3n+1) (n =1,2,3) thin films as a function of temperatureand dc electric field. Interdigitated capacitors and coplanar waveguides wereused to extract the frequency response from 500 Hz to 40 GHz. At roomtemperature, the in-plane relative permittivities obtained forSr(n+1)Ti(n)O(3n+1) (n =1,2,3) were 42+/-3, 54+/-3, and 77+/-2, respectively,and were independent of frequency. At low temperatures, permittivity increasesand electric field tunability develops in Sr(4)Ti(3)O(10).

Broadband Dielectric Spectroscopy of Ruddlesden-Popper Sr$_{n+1}$Ti$_{n}$O$_{3n+1}$ ($n$ = 1, 2, 3) Thin Films