Antiferromagnetism in the Vortex Cores of YBa₂Cu₃O₇₋δ
Mitrovi{ć}, V. F. · Sigmund, E. E. · Halperin, W. P. · Reyes, A. P. · Kuhns, P. · Moulton, W. G.
الأصل · EN
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, 1/¹⁷T₁, of planar ¹⁷O, in near-optimally doped YB₂Cu₃O₇₋δ (YBCO), was measured. Outside of the core, (¹⁷T₁T)⁻¹ is independent of temperature consistent with theoretical predictions for a d-wave superconductor. In the vortex core (¹⁷T₁T)⁻¹ increases with decreasing temperature following an antiferromagnetic Curie-Weiss law.
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