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The Cu spin magnetism in La2-x-yEuySrxCuO4 (x<=0.17; y<=0.2) has been studiedby means of magnetization measurements up to 14 T. Our results clearly showthat in the antiferromagnetic phase Dzyaloshinsky-Moriya (DM)superexchangecauses Cu spin canting not only in the LTO phase but also in the LTLO and LTTphases. In La1.8Eu0.2CuO4 the canted DM-moment is about 50% larger than in pureLa2CuO4 which we attribute to the larger octahedral tilt angle. We also findclear evidence that the size of the DM-moment does not change significantly atthe structural transition at T_LT from LTO to LTLO and LTT. The most importantchange induced by the transition is a significant reduction of the magneticcoupling between the CuO2 planes. As a consequence, the spin-flip transition ofthe canted Cu spins which is observed in the LTO phase for magnetic fieldperpendicular to the CuO2 planes disappears in the LTT phase. The shape of themagnetization curves changes from the well known spin-flip type to aweak-ferromagnet type. However, no spontaneous weak ferromagnetism is observedeven at very low temperatures, which seems to indicate that the interlayerdecoupling in our samples is not perfect. Nonetheless, a small fraction (<15%)of the DM-moments can be remanently magnetized throughout the entireantiferromagnetically ordered LTT/LTLO phase, i.e. for T<T_LT and x<0.02. Itappears that the remanent DM-moment is perpendicular to the CuO2 planes. Formagnetic field parallel to the CuO2 planes we find that the critical field ofthe spin-flop transition decreases in the LTLO phase, which might indicate acompetition between different in-plane anisotropies. To study the Cu spinmagnetism in La2-x-yEuySrxCuO4, a careful analysis of the Van Vleckparamagnetism of the Eu3+ ions was performed.Comment: 22 pages, 27 figure

physical review. b, condensed matter and materials physics

Dzyaloshinsky-Moriya spin canting in the low-temperature tetragonal phase of<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:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Eu</mml:mi><mml:mi>y</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi …

Dzyaloshinsky-Moriya spin canting in the low-temperature tetragonal phase ofLa2−x−yEuySrx