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APS » Journals » Phys. Rev. B » Volume 55 » Issue 22
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Phys. Rev. B 55, R14737–R14740 (1997)

Vortex melting in polycrystalline YBa2Cu3O7 from 17O NMR

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A. P. Reyes, X. P. Tang, H. N. Bachman, and W. P. Halperin
Northwestern University and Science and Technology Center for Superconductivity, Evanston, Illinois 60208

J. A. Martindale and P. C. Hammel
Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Line-shape analysis of 17O NMR spectra is used to probe vortex melting and dynamics in aligned powders of YBa2O3O7. Vortex transitions are identified by comparing their dynamics with the NMR time scale. Line- shape changes indicate a well-defined melting transition at a temperature, Tm. Below Tm there is a coexistence regime of solid and liquid vortices with a lower bound, Tg, which marks complete vortex freezing.

© 1997 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.55.R14737
DOI:
10.1103/PhysRevB.55.R14737
PACS:
74.25.Nf, 74.40.+k, 74.60.Ge
 
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