One-Dimensional Nature of the Magnetic Fluctuations in YBa2Cu3O6.6
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 YBa2Cu3O(7-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.
H. A. Mook et al., "One-Dimensional Nature of the Magnetic Fluctuations in YBa2Cu3O6.6," Nature, vol. 404, no. 6779, pp. 729-731, Nature Publishing Group, Apr 2000.
The definitive version is available at http://dx.doi.org/10.1038/35008005
Materials Science and Engineering
Keywords and Phrases
barium derivative; copper derivative; anisotropy; conductor; crystal; high temperature; magnetic field; neutron scattering; review
International Standard Serial Number (ISSN)
Article - Journal
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