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Fig. 6 Global phase diagram.
Global phase diagram. Electronic phase diagram of fcc RbxCs3−xC60 showing the evolution of Tc (ambient P: solid triangles, high P: unfilled triangles) and the MJTI-to-JTM crossover temperature, T′ (SXRPD: squares; χ(T): stars; 13C, 87Rb, and 133Cs NMR spectroscopy: hexagon with white, color, and black edges, respectively; IR spectroscopy: diamonds), as a function of V. Within the metallic (superconducting) regime, gradient shading from orange to green schematically illustrates the JTM to conventional metal (unconventional to weak-coupling BCS conventional superconductor) crossover. Dashed lines mark experimental V(T) tracks for selected compositions. Upper panels: Evolution of T1u(4) IR lineshape through conventional metal (Rb2CsC60, 30 K), JTM (Rb0.5Cs2.5C60, 37 K), and MJTI (Rb0.35Cs2.65C60,130 K), together with schematic depictions of the respective molecular electronic structure, intermolecular electron hopping, and JT molecular distortion. Lower panel: Variation in superconducting gap divided by Tc, 2Δ0/kBTc, with V. Ruth H. Zadik et al. Sci Adv 2015;1:e Copyright © 2015, The Authors
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