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APS » Journals » Phys. Rev. Lett. » Volume 80 » Issue 8
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Phys. Rev. Lett. 80, 1726–1729 (1998)

High-Field Vortex Dynamics in YBa2Cu3O7 from 17O Nuclear Magnetic Resonance

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H. N. Bachman, A. P. Reyes*, V. F. Mitrovic, and W. P. Halperin
Department of Physics and Astronomy, and Science and Technology Center for Superconductivity, Northwestern University, Evanston, Illinois 60208

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

Received 22 August 1997; published in the issue dated 23 February 1998

The magnetic field–temperature phase diagram for vortex dynamics in YBa2Cu3O7 has been extended up to 24 T based on 17O NMR experiments on aligned powders. Both spectrum analysis and spin-spin relaxation experiments indicate that vortices are pinned below a temperature Tp, which for low fields is consistent with Tm, the first order melting transition for clean, untwinned crystals. At high fields 10–24 T, Tp is 80 K and field independent. Pinned vortices have a Lorentzian spectral density of field fluctuations with a sharp onset.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.1726
DOI:
10.1103/PhysRevLett.80.1726
PACS:
74.25.Nf, 74.40.+k, 74.60.Ge

*Present address: National High Magnetic Field Lab, Tallahassee, FL 32310.

†Present address: University of North Carolina at Chapel Hill, Chapel Hill, NC 27599.

 
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