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Magnetic vortex lattice in HgBa2CuO4+x observed by small-angle neutron scattering

We report a direct observation of the magnetic vortex lattice in the model high-temperature superconductor HgBa2CuO4+x. Using small-angle neutron scattering on high-quality crystals, we observe two equal domains of undistorted triangular vortex lattices well-aligned with the tetragonal crystallographic axes. The signal decreases rapidly with increasing magnetic field and vanishes above 0.4 Tesla, which we attribute to a crossover from a three-dimensional to a two-dimensional vortex system, similar to previous results for the more anisotropic compound Bi2.15Sr1.95CaCu2O8+x. Our result indicates that a triangular vortex lattice at low magnetic fields is a generic property to cuprates with critical temperatures above 80 K.

preprint2010arXivOpen access
Yuan LiN. EgetenmeyerJ. L. GavilanoN. BarisicM. Greven
cond-mat.supr-con
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Yuan LiN. EgetenmeyerJ. L. GavilanoN. BarisicM. Greven

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