Physics – Condensed Matter – Superconductivity
Scientific paper
2004-09-16
Physics
Condensed Matter
Superconductivity
6 pages, 6 figures, to be published in Physical Review B
Scientific paper
10.1103/PhysRevB.70.174520
The weak ferromagnetism of La_{1.99}Sr_{0.01}CuO_4 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 YAlO_3(001), it is notably suppressed in the films grown on SrTiO_3(100) and (LaAlO_3)_{0.3}(SrAl_{0.5}Ta_{0.5}O_3)_{0.7}(100), and almost disappears in films grown on LaSrAlO_4(001). The strong suppression of the steplike magnetoresistance provides evidence that the CuO_2 planes are much less corrugated in thin films grown on tetragonal substrates, particularly on LaSrAlO_4(001), than in bulk crystals.
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