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The weak ferromagnetism of La_{1.99}Sr_{0.01}CuO_4 epitaxial thin films isinvestigated using magnetoresistance measurement. While a steplike negativemagnetoresistance associated with the weak ferromagnetic transition is clearlyobserved in the films grown on YAlO_3(001), it is notably suppressed in thefilms grown on SrTiO_3(100) and(LaAlO_3)_{0.3}(SrAl_{0.5}Ta_{0.5}O_3)_{0.7}(100), and almost disappears infilms grown on LaSrAlO_4(001). The strong suppression of the steplikemagnetoresistance provides evidence that the CuO_2 planes are much lesscorrugated in thin films grown on tetragonal substrates, particularly onLaSrAlO_4(001), than in bulk crystals.Comment: 6 pages, 6 figures, to be published in Physical Review

physical review. b, condensed matter and materials physics

Weak ferromagnetism 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:mn>1.99</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>0.01</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>thin films: Evidence for the removal of corrugation in the<mml:math xmlns:mml="http://www…

Weak ferromagnetism ofLa1.99Sr0.01CuO4thin films: Evidence for the removal of corrugation in the