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

Details Linear and nonlinear electrodynamic response of bulk CaC6 in the microwave regime Linear and nonlinear electrodynamic response of bulk CaC6 in the microwave regime

2006-10-18

arxiv.org/abs/cond-mat/0610497v1

Physics

Condensed Matter

Superconductivity

8 pages, 4 figures, submitted to Appl. Phys. Lett

Scientific paper

10.1063/1.2769763

The linear and nonlinear response to a microwave electromagnetic field of two c-axis oriented polycrystalline samples of the newly discovered superconductor CaC6 (Tc = 11.5 K) is studied in the superconducting state down to 2 K. The surface resistance Rs and the third order intermodulation distortion, arising from a two-tone excitation, have been measured as a function of temperature and microwave circulating power. Experiments are carried out using a dielectrically loaded copper cavity operating at 7 GHz in a "hot finger" configuration. The results confirm recent experimental findings that CaC6 behaves as a weakly-coupled, fully gapped, superconductor. The weak power dependence of Rs encourages a further investigation of this novel superconductor as a possible alternative to Nb in specific microwave applications.

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