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Phys. Rev. Lett. 80, 600 - 603 (1998)

Vortex Pinning of Anisotropically Splayed Defects in YBa2Cu3O7-δ

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W. K. Kwok, L. M. Paulius *, V. M. Vinokur, A. M. Petrean †, R. M. Ronningen ‡, and G. W. Crabtree
Materials Science and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60435

Received 24 March 1997

Pinning by splayed defects created by 3.9 GeV 197Au29+ ions is studied using transport measurements of vortex motion perpendicular and parallel to the splay plane in untwinned crystals of YBa2Cu3O7-δ. We compare the transport properties of the crystals and demonstrate (i) a new 1/H dependence of the vortex liquid pinning energy, (ii) a crossing of the irreversibility lines before and after irradiation, and (iii) a stronger temperature dependence of the critical current for vortex motion perpendicular to the splay plane than for motion parallel to the splay plane.


©1998 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.80.600
DOI: 10.1103/PhysRevLett.80.600
PACS: 74.60.Ge

* Present address: Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008.
†
‡ Present address: NSCL, Michigan State University, East Lansing, Michigan 48834.

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