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The magnetic phase diagram of slightly overdoped La{2-x}Sr{x}CuO{4} (x=0.17)is characterised by a field-induced hexagonal to square transition of thevortex lattice at low fields (~0.4 Tesla) [R. Gilardi et al., Phys. Rev. Lett.88, 217003 (2002)]. Here we report on a small angle neutron scattering study ofthe vortex lattice at higher fields, that reveals no further change of thecoordination of the square vortex lattice up to 10.5 Tesla appliedperpendicular to the CuO2 planes. Moreover, it is found that the diffractionsignal disappears at temperatures well below Tc, due to the melting of thevortex lattice.Comment: 3 pages, 2 figures. Presented at the New3SC-4 meeting, San Diego,  Jan. 16-21 2003; to be published in Int. J. Mod. Phys.

international journal of modern physics b/international journal of modern physics b

A Small Angle Neutron Scattering Study of the Vortex Matter in La2-xSrxCuO4 (x=0.17)