Square vortex lattice at anomalously low magnetic fields in electron-doped Nd$_{1.85}$Ce$_{0.15}$CuO$_{4}$

Details Square vortex lattice at anomalously low magnetic fields in electron-doped Nd$_{1.85}$Ce$_{0.15}$CuO$_{4}$ Square vortex lattice at anomalously low magnetic fields in electron-doped Nd$_{1.85}$Ce$_{0.15}$CuO$_{4}$

2004-10-11

arxiv.org/abs/cond-mat/0410250v1

Phys. Rev. Lett. 93 (2004) 217001

Physics

Condensed Matter

Superconductivity

4 pages, 4 Figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.93.217001

We report here on the first direct observations of the vortex lattice in the bulk of electron-doped Nd$_{1.85}$Ce$_{0.15}$CuO$_{4}$ single crystals. Using small angle neutron scattering, we have observed a square vortex lattice with the 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 decrease rapidly with increasing magnetic field.

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