Charge and Spin Structure in ${\mathrm{YBa}}_2{\mathrm{Cu}}_3{O}_{6.35}$

Neutron scattering has been used to measure the charge and spin structure in the highly underdoped superconductor ${\mathrm{YBa}}_2{\mathrm{Cu}}_3{\mathrm{O}}_{6.35}$. Incommensurate static charge ordering is found that remains at high temperatures. The magnetic pattern is complex with a resonance and incommensurate structure observed at low temperatures. The results clarify the role of striped phases in ${\mathrm{YBa}}_2{\mathrm{Cu}}_3{\mathrm{O}}_{6+x}$ superconductors.