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Cooperative coupling of static magnetism and bulk superconductivity in the stripe phase of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>โ</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ba</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> : Pressure- and doping-dependent studies
Static spin-stripe order and superconductivity were systematically studied in ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Ba}}_{x}{\mathrm{CuO}}_{4}$ $(0.11\ensuremath{\le}x\ensuremath{\le}0.17)$ at ambient pressure by means of magnetization and $\ensuremath{\mu}\mathrm{SR}$ experiments. We find that all the investigated ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Ba}}_{x}{\mathrm{CuO}}_{4}$ samples exhibit static spin-stripe order and that the quasi-two-dimensional superconducting (SC) transition temperature ${T}_{\mathrm{c}1}$ and the static spin-stripe order temperature ${T}_{\mathrm{so}}$ have โฆ