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High magnetic field studies of the vortex lattice structure in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">YBa</mml:mi><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:msub><mml:mrow /><mml:mn>7</mml:mn></mml:msub></mml:math>
We report on small-angle neutron scattering (SANS) measurements of the vortex lattice (VL) in twin-free $\mathrm{YBa}{}_{2}\mathrm{Cu}{}_{3}\mathrm{O}{}_{7}$, extending the previously investigated maximum magnetic field of 11 T up to 16.7 T with the field applied parallel to the c axis. This is a microscopic study of vortex matter in this region …