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We report here on the first direct observations of the vortex lattice in thebulk of electron-doped Nd$_{1.85}$Ce$_{0.15}$CuO$_{4}$ single crystals. Usingsmall angle neutron scattering, we have observed a square vortex lattice withthe nearest-neighbors oriented at 45$^{\circ}$ from the Cu-O bond direction,which is consistent with theories based on the d-wave superconducting gap.However, the square symmetry persists down to unusually low magnetic fields.Moreover, the diffracted intensity from the vortex lattice is found to decreaserapidly with increasing magnetic field.Comment: 4 pages, 4 Figures, accepted for publication in Phys. Rev. Let

physical review letters

Square Vortex Lattice at Anomalously Low Magnetic Fields in Electron-Doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">N</mml:mi><mml:mi mathvariant="normal">d</mml:mi></mml:mrow><mml:mn>1.85</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mn>0.15</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi …

Square Vortex Lattice at Anomalously Low Magnetic Fields in Electron-DopedNd1.85Ce0.15C