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We report neutron scattering measurements of the structure and magnetism ofstage-4 La_2CuO_{4+y} with T_c ~42 K. Our diffraction results on a singlecrystal sample demonstrate that the excess oxygen dopants form athree-dimensional ordered superlattice within the interstitial regions of thecrystal. The oxygen superlattice becomes disordered above T ~ 330 K, and a fastrate of cooling can freeze-in the disordered-oxygen state. Hence, bycontrolling the cooling rate, the degree of dopant disorder in ourLa_2CuO_{4+y} crystal can be varied. We find that a higher degree of quencheddisorder reduces T_c by ~ 5 K relative to the ordered-oxygen state. At the sametime, the quenched disorder enhances the spin density wave order in a manneranalogous to the effects of an applied magnetic field.Comment: 4 figures included in text; submitted to PR

physical review. b, condensed matter and materials physics

Neutron scattering study of the effects of dopant disorder on the superconductivity and magnetic order in stage-4<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></…

Neutron scattering study of the effects of dopant disorder on the superconductivity and magnetic order in stage-4La2CuO4+y