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Phys. Rev. B 60, R12585–R12588 (1999)

Interstitial flux phases in a superconducting niobium film with a square lattice of artificial pinning centers

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V. Metlushko, U. Welp, G. W. Crabtree, R. Osgood, and S. D. Bader
MSD, ANL, Argonne, Illinois 60439-4845

L. E. DeLong
University of Kentucky, Lexington, Kentucky 40506-0055

Zhao Zhang and S. R. J. Brueck
University of New Mexico, Albuquerque, New Mexico 87131

B. Ilic, K. Chung, and P. J. Hesketh
EECS, University of Illinois at Chicago, Chicago, Illinois 60607

Received 17 June 1999; published in the issue dated 1 November 1999

We demonstrate that a square lattice of artificial pinning centers in a superconducting Nb film induces the formation of highly ordered interstitial vortex phases with different symmetries for external magnetic fields as high as the eighth matching field. These “supermatching” phases are identified by distinct differences in the behavior of their critical currents, magnetoresistivity, and magnetization. Our results are consistent with predictions of supermatching lattice symmetries by recent numerical simulations.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.60.R12585
DOI:
10.1103/PhysRevB.60.R12585
PACS:
74.60.Ge, 74.25.Ha, 74.76.Db
 
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