First observation of a flux-vortex lattice in the high-T_c superconductor La_1.83 Sr_0.17 CuO₄, using small-angle neutron scattering. As an applied magnetic field is increased, the lattice changes from triangular (not shown) to square (a). Then, as the c axis of the crystal is rotated away from the magnetic field, the square lattice distorts to rhomboid (b).

From the article:

Direct Evidence for an Intrinsic Square Vortex Lattice in the Overdoped High- ${\mathit{T}}_{\mathit{c}}$ Superconductor ${\mathrm{La}}_{1.83}{\mathrm{Sr}}_{0.17}{\mathrm{CuO}}_{4+\mathit{\delta }}$
R. Gilardi, J. Mesot, A. Drew, U. Divakar, S. L. Lee, E. M. Forgan, O. Zaharko, K. Conder, V. K. Aswal, C. D. Dewhurst, R. Cubitt, N. Momono, and M. Oda
Phys. Rev. Lett. 88, 217003 (2002)

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