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High-pressure Na3(N2)4, Ca3(N2)4, Sr3(N2)4, and Ba(N2)3 featuring nitrogen dimers with noninteger charges and anion-driven metallicity

High-pressure Na3(N2)4, Ca3(N2)4, Sr3(N2)4, and Ba(N2)3 featuring nitrogen dimers with noninteger charges and anion-driven metallicity

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