Observation of Magnetic Order in a $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6.6}$ Superconductor

H. A. Mook, Y. Sidis, B. Fauqué +2

Polarized beam neutron scattering measurements on a highly perfect crystal of $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6.6}$ show a distinct magnetic transition with an onset at about 235K, the temperat…