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APS » Journals » Phys. Rev. B » Volume 67 » Issue 22
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Phys. Rev. B 67, 220503(R) (2003) [4 pages]

Antiferromagnetism in the vortex cores of YBa2Cu3O7-δ

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V. F. Mitrović, E. E. Sigmund, and W. P. Halperin
Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA

A. P. Reyes, P. Kuhns, and W. G. Moulton
National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA

Received 7 April 2003; published 17 June 2003

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, 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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.220503
DOI:
10.1103/PhysRevB.67.220503
PACS:
74.25.Nf, 74.40.+k, 74.72.Bk
 
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