Abstract
Muon spin rotation and magnetization measurements in ultraclean single crystals of superconducting ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6+x}$ $(x=0.375)$ reveal transitions at $T=19$ K to a bulk superconducting state and below $T=15$ K to a disordered antiferromagnetic state. The superconducting state pins magnetic flux. At the lowest temperatures an internal magnetic field with a magnitude close to that seen in the antiferromagnetic parent compound is present throughout the bulk of the sample. The two states coexist on a nanometer length scale, and over a narrow region of oxygen doping.
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