Observation of Magnetic Order in a YBa2Cu3O6.6 Superconductor
Abstract
Polarized beam neutron scattering measurements on a highly perfect crystal of YBa2Cu3O6.6 show a distinct magnetic transition with an onset at about 235K, the temperature expected for the pseudogap transition. The moment is found to be about 0.1 μB for each sublattice and have a correlation length of at least 75 . We found the critical exponent for the magnetic neutron intensity to be 2β =0.37 0.12. This is the proper range for the class of transition that has no specific heat divergence possibly explaining why none is found at the pseudogap transition.
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