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

Abstract

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 distribution of the vortex state of YBa${}_2$Cu${}_3$O${}_{6.50}$ in applied fields of $H=1$ T and $H=4$ T reveal a feature in the high-field tail of the field distribution which is not present in optimally doped YBa${}_2$Cu${}_3$O${}_{6.95}$ and which fits well to a model with static magnetic fields in the vortex cores. The magnitude of the fields is estimated to be 18(2) G and decreases above $T=10$ K. We discuss possible origins of the additional vortex core magnetism within the context of existing theories.

Submitted to PRL; corresponding author: [email protected]

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• Spins in the Vortices of a High Temperature Superconductor
• Spin ordering quantum transitions of superconductors in a magnetic field
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