Fig. 1 Crystal structure and superconductivity in fcc fullerides.

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Fig. 1 Crystal structure and superconductivity in fcc fullerides. Crystal structure and superconductivity in fcc fullerides. (A) Crystal structure of fcc A3C60 (A = alkali metal, green spheres represent cations on tetrahedral, and red on octahedral sites, respectively). The C603– anions adopt two orientations related by 90° rotation about [100]—only one is shown at each site. (B) Final observed (red), calculated (blue), and difference (green) SXRPD profiles for Rb0.5Cs2.5C60 (λ = 0.39989 Å) at ambient temperature. Ticks show the reflection positions of fcc [83.23(3)%, top], CsC60 [3.6(1)%, middle], and Cs4C60 [13.16(7)%, bottom]. Inset: Expanded view in the range 4.7 to 5.9° with reflections labeled by their (hkl) Miller indices. (C) Temperature dependence of the magnetization, M (20 Oe, zero-field cooling) for RbxCs3−xC60 (0.35 ≤ x ≤ 2). Inset: Expanded view near Tc. (D) Pressure evolution of Tc for RbxCs3−xC60 (0.35 ≤ x ≤ 2). The lines through the data are guides to the eye. Fcc Cs3C60 (8) and Rb3C60 (17) data (dashed lines) are also included. (E) Tc as a function of C60 packing density, V at 10 K for RbxCs3−xC60 (0.35 ≤ x ≤ 2). Data are displayed as in (D). Ruth H. Zadik et al. Sci Adv 2015;1:e1500059 Copyright © 2015, The Authors