One-dimensional nature of the magnetic fluctuations in YBa2Cu 3O6.6

H. A. Mook (), Pengcheng Dai, F. Dogan and R. D. Hunt
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H. A. Mook: Oak Ridge National Laboratory
Pengcheng Dai: Oak Ridge National Laboratory
F. Dogan: University of Washington
R. D. Hunt: Oak Ridge National Laboratory

Nature, 2000, vol. 404, issue 6779, 729-731

Abstract: Abstract There is increasing evidence that inhomogeneous distributions of charge and spin—so-called ‘striped phases’—play an important role in determining the properties of the high-temperature superconductors. For example, recent neutron-scattering measurements on the YBa2Cu 3O7-x family of materials show both spin and charge fluctuations that are consistent with the striped-phase picture. But the fluctuations associated with a striped phase are expected to be one-dimensional, whereas the magnetic fluctuations observed to date appear to display two-dimensional symmetry. We show here that this apparent two-dimensionality results from measurements on twinned crystals, and that similar measurements on substantially detwinned crystals of YBa2Cu3O6.6 reveal the one-dimensional character of the magnetic fluctuations, thus greatly strengthening the striped-phase interpretation. Moreover, our results also suggest that superconductivity originates in charge stripes that extend along the 𝖻 crystal axis, where the superfluid density is found to be substantially larger than for the 𝖺 direction.

Date: 2000
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DOI: 10.1038/35008005

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