Antiferromagnetism in the Vortex Cores of YBa$_2$Cu$_3$O$_{7-\delta}$

We report spatially resolved nuclear magnetic resonance measurements on a high temperature superconductor that indicate the presence of correlated antiferromagnetic fluctuations in the vortex core. The nuclear spin-lattice relaxation rate, $1 /^{17} T_{1}$ , of planar $^{17} O$ , in near-optimally doped YB $_{2}$ Cu $_{3}$ O $_{7 - δ}$ (YBCO), was measured. Outside of the core, $(^{17} T_{1} T)^{- 1}$ is independent of temperature consistent with theoretical predictions for a {\it d}-wave superconductor. In the vortex core $(^{17} T_{1} T)^{- 1}$ increases with decreasing temperature following an antiferromagnetic Curie-Weiss law.

Antiferromagnetism in the Vortex Cores of YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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Antiferromagnetism in the Vortex Cores of YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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Antiferromagnetism in the Vortex Cores of YBa22​Cu33​O7−δ7−δ​

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Antiferromagnetism in the Vortex Cores of YBa22​Cu33​O7−δ7−δ​

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Antiferromagnetism in the Vortex Cores of YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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Antiferromagnetism in the Vortex Cores of YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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