5 July 1996 Evidence for a c-axis plasma mode in layered superconductors and its relation to the Josephson and pancake vortices
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Abstract
A c-axis resonance mode has been observed directly in (formula available in paper) single crystal s using ac bolometric technique. The resonance is observed in the 30 to 90 GHz frequency range in the presence of an applied magnetic field H ((parallel)c). Below the irreversibility line Tirr(B), the magnetic field and temperature dependence of the resonance can be summarized as (formula available in paper) and (formula available in paper)are temperature independent but sample dependent parameters. Above (formula available in paper) decreases slowly with T. We report results for measurements carried out in an oblique magnetic field, where an unusual re-entrance cusp is observed for (formula available in paper). This provides firm evidence that it is the Josephson plasma mode. By fitting the data to a recent calculation by Bulaevskii et al., we obtain the anisotropy parameter (gamma) equals 420 and zero field Josephson plasma frequency 5.3 cm-1.
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Ophelia K.C. Tsui, "Evidence for a c-axis plasma mode in layered superconductors and its relation to the Josephson and pancake vortices", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); doi: 10.1117/12.250257; https://doi.org/10.1117/12.250257
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