Polarized and unpolarized neutron diffraction has been used to search for magnetic order in YBa2Cu3O6+x superconductors. Most of the measurements were made on a high quality crystal of YBa2CU3O6.6. It is shown that this crystal has highly ordered ortho-II chain order, and a sharp superconducting transition. Inelastic scattering measurements display a very clean spin-gap and pseudogap with any intensity at 10 meV being 50 times smaller than the resonance intensity. The crystal shows a complicated magnetic order that appears to have three components. A magnetic phase is found at high temperatures that seems to stem from an impurity with a moment that is in the a-b plane, but disordered on the crystal lattice. A second ordering occurs near the pseudogap temperature that has a shorter correlation length than the high temperature phase and a moment direction that is at least partly along the c axis of the crystal. Its moment direction, temperature dependence, and Bragg intensities suggest that it may stem from orbital ordering of the d-density wave type. An additional intensity increase occurs below the superconducting transition. The magnetic intensity in these phases does not change noticeably in a 7 T magnetic field aligned approximately along the c axis. Searches for magnetic order in YBa2Cu3O7 show no signal while a small magnetic intensity is found in YBa2Cu3O6.45 that is consistent with the c axis directed magnetic order. The results are contrasted with other recent neutron measurements.
H. A. Mook et al., "Magnetic Order in YBa2Cu3O6+x Superconductors," Physical Review B - Condensed Matter and Materials Physics, vol. 66, no. 14, pp. 144513-1-144513-10, American Physical Society (APS), Oct 2002.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevB.66.144513
Materials Science and Engineering
Keywords and Phrases
barium derivative; copper derivative; yttrium, crystal; energy; high temperature; magnetic field; magnetism; measurement; neutron; polarization; thermal conductivity
International Standard Serial Number (ISSN)
Article - Journal
© 2002 American Physical Society (APS), All rights reserved.