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The linear and nonlinear response to a microwave electromagnetic field of twoc-axis oriented polycrystalline samples of the newly discovered superconductorCaC6 (Tc = 11.5 K) is studied in the superconducting state down to 2 K. Thesurface resistance Rs and the third order intermodulation distortion, arisingfrom a two-tone excitation, have been measured as a function of temperature andmicrowave circulating power. Experiments are carried out using a dielectricallyloaded copper cavity operating at 7 GHz in a "hot finger" configuration. Theresults confirm recent experimental findings that CaC6 behaves as aweakly-coupled, fully gapped, superconductor. The weak power dependence of Rsencourages a further investigation of this novel superconductor as a possiblealternative to Nb in specific microwave applications.Comment: 8 pages, 4 figures, submitted to Appl. Phys. Let

Linear and nonlinear electrodynamic responses of bulk CaC6 in the microwave regime