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Here we report in situ formation of tin-vacancy color centers in microcrystalline and aggregated diamonds synthesized in Sn-C growth system at pressure of 8–9 GPa and temperatures of 1700–2000 K. Bright zero phonon line at 620 nm and a broad line at 660 nm in its sideband were only features in luminescence of the center in single microcrystals at room temperature. Diluting the growth system by lighter...
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