Physics – Condensed Matter – Superconductivity
Scientific paper
2009-06-09
Phys. Rev. Lett. 103, 167002 (2009)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures
Scientific paper
We present muon spin relaxation (muSR) measurements on a large YBa2Cu3O6.6 single crystal in which two kinds of unusual magnetic order have been detected in the pseudogap region by neutron scattering. A comparison is made to measurements on smaller, higher quality YBa2Cu3Oy single crystals. One type of magnetic order is observed in all samples, but does not evolve significantly with hole doping. A second type of unusual magnetic order is observed only in the YBa2Cu3O6.6 single crystal. This magnetism has an ordered magnetic moment that is quantitatively consistent with the neutron experiments, but is confined to just a small volume of the sample (~ 3%). Our findings do not support theories that ascribe the pseudogap to a state characterized by loop-current order, but instead indicate that dilute impurity phases are the source of the unusual magnetic orders in YBa2Cu3Oy.
Bonn Douglas A.
Hardy Walter N.
Liang Ruixing
Mook Herbert A.
Pacradouni V.
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