Physics – Condensed Matter – Superconductivity
Scientific paper
2002-03-05
Phys. Rev. B 66, 024505 (2002)
Physics
Condensed Matter
Superconductivity
6 pages 4 figures RevTex Submitted to Phys Rev B January 23, 2002
Scientific paper
10.1103/PhysRevB.66.024505
We present elastic and inelastic neutron scattering results on highly oxygen ordered YBa2Cu3O6.5 ortho-II. We find no evidence for the presence of ordered magnetic moments to a sensitivity of 0.003 Bohr magnetons, an order of magnitude smaller than has been suggested in theories of orbital or d-density-wave (DDW) currents. The absence of sharp elastic peaks, shows that the d-density-wave phase is not present, at least for the superconductor with the doping of 6.5 and the ordered ortho-II structure. We cannot exclude the possibility that a broad peak may exist with extremely short-range DDW correlations. For less ordered or more doped crystals it is possible that disorder may lead to static magnetism. We have also searched for the large normal state spin gap that is predicted to exist in an ordered DDW phase. Instead of a gap we find that the Q-correlated spin susceptibility persists to the lowest energies studied, 6 meV. Our results are compatible with the coexistence of superconductivity with orbital currents, but only if they are dynamic, and exclude a sharp phase transition to an ordered d-density-wave phase.
Bonn Daniel
Buyers W. J. L.
Hardy Walter N.
Liang Ruixing
Peets D.
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