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The spin-density wave (SDW) and charge-density wave (CDW) order insuperconducting La1.45Nd0.4Sr0.15CuO4 were studied under an applied magneticfield using neutron and X-ray diffraction techniques. In zero field,incommensurate (IC) SDW order appears below ~ 40 K, which is characterized byneutron diffraction peaks at (1/2 +/- 0.134, 1/2 +/- 0.134, 0). The intensityof these IC peaks increases rapidly below T_Nd ~ 8 K due to an ordering of theNd^3+ spins. The application of a 1 T magnetic field parallel to the c-axismarkedly diminishes the intensity below T_Nd, while only a slight decrease inintensity is observed at higher temperatures for fields up to 7 T. Ourinterpretation is that the c-axis field suppresses the parasitic Nd^3+ spinorder at the incommensurate wave vector without disturbing the stripe order ofCu^2+ spins. Consistent with this picture, the CDW order, which appears below60 K, shows no change for magnetic fields up to 4 T. These results stand incontrast to the significant field-induced enhancement of the SDW order observedin superconducting La2-xSrxCuO4 with x ~ 0.12 and stage-4 La2CuO4+y. Thedifferences can be understood in terms of the relative volume fractionexhibiting stripe order in zero field, and the collective results areconsistent with the idea that suppression of superconductivity by vorticesnucleates local patches of stripe order.Comment: 7 pages, 5 figure

physical review. b, condensed matter

Effect of a magnetic field on the spin- and charge-density-wave order in<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>1.45</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>0.4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</…

Effect of a magnetic field on the spin- and charge-density-wave order inLa1.45Nd0.4Sr