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Spin gap in the single spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math>chain cuprate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mrow><mml:mn>1.9</mml:mn></mml:mrow></mml:msub></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mrow><mml:mn>0.1</mml:mn></mml:mrow></mml:msub></…
We report $^{63}\mathrm{Cu}$ nuclear magnetic resonance and muon spin rotation measurements on the $S=1/2$ antiferromagnetic Heisenberg spin chain compound ${\mathrm{Sr}}_{1.9}$${\mathrm{Ca}}_{0.1}$${\mathrm{CuO}}_{3}$. An exponentially decreasing spin-lattice relaxation rate ${T}_{1}^{\ensuremath{-}1}$ indicates the opening of a spin gap. This behavior is very similar to what has been observed for the cognate zigzag spin chain …