Fig. 1. (Color online) (a, b) Crystal structure of (a) HT-Ni3Sn2 and (b) LT-Ni3Sn2. Red, green, and black balls represent Ni(I), Ni(II) and Sn, respectively. (c, d) Top-view schematic of (c) HT-Ni3Sn2 and (d) LT- Ni3Sn2. (e, f) Optical image of HT-Ni3Sn2 and LT-Ni3Sn2.
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