Electrodynamics of the organic superconductors K - ( BEDT - TTFhCu ( NCS ) 2 and K - ( BEDT - TTFhCu
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چکیده
We have performed measurements of the surface impedance in the normal and superconducting states of the title compounds in the millimeter wave-frequency range (1-3 cm-1), and have evaluated the complex conductivity for different crystallographic orientations. Above the transition temperature, the materials behave like metals with a scattering rate of approximately 20 cm -1. In the superconducting state the electrodynamics is in good agreement with calculations based on a Bes ground state: while the penetration depth and the coherence length are anisotropic, the superconducting energy gap shows no indications of line nodes.
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تاریخ انتشار 2009