Observation of Magnetic Order in a ${\rm YBa_2Cu_3O_{6.6}}$ Superconductor

Details Observation of Magnetic Order in a ${\rm YBa_2Cu_3O_{6.6}}$ Superconductor Observation of Magnetic Order in a ${\rm YBa_2Cu_3O_{6.6}}$ Superconductor

2008-02-25

arxiv.org/abs/0802.3620v1

Phys. Rev. B, 78, 020506(R), (2008)

Physics

Condensed Matter

Superconductivity

3 figures

Scientific paper

10.1103/PhysRevB.78.020506

Polarized beam neutron scattering measurements on a highly perfect crystal of ${\rm YBa_2Cu_3O_{6.6}}$ 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 $\mu_B$ for each sublattice and have a correlation length of at least 75 \AA. We found the critical exponent for the magnetic neutron intensity to be 2$\beta$ =0.37$\pm$ 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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