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Evidence for static alternating magnetic fields in the vortex cores ofunderdoped YBa$_2$Cu$_3$O$_{6+x}$ is reported. Muon spin rotation measurementsof the internal magnetic field distribution of the vortex state ofYBa$_2$Cu$_3$O$_{6.50}$ in applied fields of $H = 1$ T and $H = 4$ T reveal afeature in the high-field tail of the field distribution which is not presentin optimally doped YBa$_2$Cu$_3$O$_{6.95}$ and which fits well to a model withstatic magnetic fields in the vortex cores. The magnitude of the fields isestimated to be 18(2) G and decreases above $T = 10$ K. We discuss possibleorigins of the additional vortex core magnetism within the context of existingtheories.Comment: Submitted to PRL; corresponding author: miller@physics.ubc.c

physical review letters

Evidence for Static Magnetism in the Vortex Cores of Ortho-II<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>6.50</mml:mn></mml:mrow></mml:msub></mml:…

Evidence for Static Magnetism in the Vortex Cores of Ortho-IIYBa2Cu3O6.50