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Anisotropic Spin Freezing in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">S</mml:mi><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mn>1</mml:mn><mml:mn /><mml:mi>/</mml:mi><mml:mn>2</mml:mn></mml:math>Zigzag Chain Compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>SrCuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
We characterize an unusual magnetic phase in orthorhombic ${\mathrm{SrCuO}}_{2}$ using neutron scattering. ${\mathrm{SrCuO}}_{2}$ contains zigzag spin chains formed by pairs of linear $S\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1/2$ chains ( $J\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}180$ meV) coupled through a frustrated interaction ( $|{J}^{\ensuremath{'}}|\ensuremath{\lesssim}0.1J$). For $T<{T}_{c1}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}5.0(4)$ K, an elastic peak develops in a gapless spectrum indicating spin freezing on a …