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

V. F. Mitrovi{ć}; E. E. Sigmund; W. P. Halperin; A. P. Reyes; P. Kuhns; W. G. Moulton

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

V. F. Mitrovi{ć}·E. E. Sigmund·W. P. Halperin·A. P. Reyes·P. Kuhns·W. G. Moulton

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Abstract

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, $(^{17}T_1T)^{-1}$ is independent of temperature consistent with theoretical predictions for a {\it d}-wave superconductor. In the vortex core $(^{17}T_1T)^{-1}$ increases with decreasing temperature following an antiferromagnetic Curie-Weiss law.

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V. F. Mitrovi{ć}, E. E. Sigmund, W. P. Halperin, A. P. Reyes, P. Kuhns, W. G. Moulton. 2003-05-01. Antiferromagnetism in the Vortex Cores of YBa$_2$Cu$_3$O$_{7-δ}$. https://arxiv.org/abs/cond-mat/0202368

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