Abstract
The temperature dependence of the upper critical field B c2 for Rb 3C 60 and K 2CsC 60 is determined by means of a.c. susceptibility measurements in external magnetic d.c. fields. The sample synthesis was optimized especially by using doubly sublimed C 60 and handling in an atmosphere with low oxygen content. The sample structure was determined by X-ray diffraction. Using the Werthamer-Helfand-Hohenberg (WHH) theory, the zero-temperature values of the upper critical field and the Ginzburg-Landau coherence lengths were estimated. The results are discussed in comparison with those of K 3C 60- and Rb 2CsC 60- and Ba-doped C 60, which shows a much smaller slope (d B c2 ( T)/d T) Tc . Furthermore, for all samples an analysis concerning the density of states N( E F) based on the upper critical field results is performed.
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