Evidence for Static Magnetism in the Vortex Cores of Ortho-II YBa${}_2$Cu${}_3$O${}_{6.50}$

R. I. Miller, R. F. Kiefl, J. H. Brewer +8

Evidence for static alternating magnetic fields in the vortex cores of underdoped YBa${}_2$Cu${}_3$O${}_{6+x}$ is reported. Muon spin rotation measurements of the internal magnetic field…