The spin dynamics of the underdoped superconductor ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6.7}$ ( ${T}_{c}\ensuremath{\sim}67\mathrm{K}$) was revealed to have an incommensurate wave vector dependence with ``pillars'' in the dispersion relation at the positions ( $\frac{1}{2}\ifmmode\pm\el...
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