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an insulator. The one-dimensional conductivity arises from bonding conditions in the S-N chain, where each sulfur atom provides two ? electrons and each nitrogen atom provides one ? electron to form two-center 3? electron bonding units. At temperatures below 0.3 K, it becomes a electrical superconductor. The Peierls distortion is inhibited by weak inter-chain interactions, which resist the characteristic bond alternation.

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