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We present neutron scattering data on two single crystals of the hightemperature superconductor La2-x(Ca,Sr)xCaCu2O6+delta. The Ca0.1-doped crystalexhibits a long-range antiferromagnetically ordered ground state. In contrast,the Sr0.15-doped crystal exhibits short-range antiferromagnetic order as wellas weak superconductivity. In both crystals antiferromagnetic correlations arecommensurate; however, some results on the Ca0.1-doped crystal resemble thoseon the spin-glass phase of La2-xSrxCuO4, where magnetic correlations becameincommensurate. In addition, both crystals show a structural transition fromtetragonal to orthorhombic symmetry. Quite remarkably, the temperaturedependence and correlation length of the magnetic order is very similar to thatof the orthorhombic distortion. We attribute this behavior to an orthorhombicstrain-induced inter-bilayer magnetic coupling, which triggers theantiferromagnetic order. The large size of the crystals made it also possibleto study the magnetic diffuse scattering along rods perpendicular to the CuO2planes in more detail. For comparison we show X-ray diffraction andmagnetization data. In particular, for the Ca0.1-doped crystal thesemeasurements reveal valuable information on the spin-glass transition as wellas a second anomaly associated with the Neel transition.Comment: 12 pages, 12 figure

physical review. b, condensed matter and materials physics

Neutron scattering study on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mn>1.9</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mn>1.1</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>6</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow…

Neutron scattering study onLa1.9Ca1.1Cu2O6+δ