Figure 1
From: Emergence of superconductivity in (NH3)yMxMoSe2 (M: Li, Na and K)
(a) Photograph of (NH3)yNa0.5MoSe2 agglomerations. (b) Powder XRD pattern of (NH3)yNa0.5MoSe2 using synchrotron radiation. ‘x’ marks correspond to the experimental XRD pattern. Red and green lines refer to calculated patterns (Le Bail fitting) and background, respectively. Ticks refer to the peak positions predicted. In (b), two phases ((NH3)yNaxMoSe2 and MoSe2) are used in Le Bail fitting. The M/H – T plots in ZFC and FC modes for the (NH3)yNa0.5MoSe2 sample providing the XRD pattern (b) are shown in the inset of (b). (c) Schematic representation of possible (NH3)yNa0.5MoSe2 structure; the structure was drawn based on the atomic coordinates shown in Table S2. As described in the text, this structure may be reasonable if the Na is located in the space between MoSe2 layers, a possibility supported by the expansion of (c).
