Weak ferromagnetism of La1.99Sr0.01CuO4 thin films: evidence for removal of corrugation in CuO2 plane by epitaxial strain
Abstract
The weak ferromagnetism of La1.99Sr0.01CuO4 epitaxial thin films is investigated using magnetoresistance measurement. While a steplike negative magnetoresistance associated with the weak ferromagnetic transition is clearly observed in the films grown on YAlO3(001), it is notably suppressed in the films grown on SrTiO3(100) and (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7(100), and almost disappears in films grown on LaSrAlO4(001). The strong suppression of the steplike magnetoresistance provides evidence that the CuO2 planes are much less corrugated in thin films grown on tetragonal substrates, particularly on LaSrAlO4(001), than in bulk crystals.
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