Superconductivity of Rb2CsC60 : ac response and upper critical field

Baenitz, M.; Heinze, M.; Lüders, K.; Werner, H.; Schloegl, R.

doi:10.1016/0038-1098(94)90629-7

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Superconductivity of Rb₂CsC₆₀ : ac response and upper critical field

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Baenitz, M., Heinze, M., Lüders, K., Werner, H., & Schloegl, R. (1994). Superconductivity of Rb₂CsC₆₀: ac response and upper critical field. Solid State Communications, 91(5), 337-340. doi:10.1016/0038-1098(94)90629-7.

Cite as: https://hdl.handle.net/21.11116/0000-0009-81A1-E

Abstract

Ternary alkali metal doped fullerene samples of the composition Rb₂CsC₆₀ were prepared with optimized synthesis conditions. The superconducting transition occurs at T_c = 32.5 K with a shielding fraction of ≈ 72 %. Detailed investigations of the complex susceptibility χ(T) = χ′(T) − iχ″(T) in dependence of different ac and dc magnetic fields are presented. The extrapolation of the upper critical field values B_c2(T) measured up to 7 T leads to the zero temperature value B_c2(0) = 50±3) T and the Ginzburg-Landau coherence length . Furthermore the application of Bean's critical state model allows a first estimation of the critical current densities j_c.