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

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arxiv 1012.0732 v1 pith:WDG5UDBE submitted 2010-12-03 cond-mat.supr-con

Yuan Li , N. Egetenmeyer , J. L. Gavilano , N. Barisic , M. Greven This is my paper · ORCID
classification cond-mat.supr-con
keywords vortexmagneticlatticeabovehgba2cuo4neutronscatteringsmall-angle
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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.

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