The interplay between antiferromagnetism and superconductivity in disordered ultrathin high-Tc films

K. M. Beauchamp, T. Wang, G. C. Spalding, A. M. Goldman

Research output: Contribution to journalArticlepeer-review


A series of ultrathin films of DyBa2Cu3O7-x, with properties spanning the zero-field superconductor-to-insulator transition, were prepared for the purpose of investigating the magnetic field driven superconductor-insulator transition. The resistance of these films was found to exhibit a peak whose magnitude became larger with the weakening of the superconductivity of the films. For a film just on the superconducting side of the zero-field superconductor-to-insulator transition, three successive changes in the sign of the low temperature dR/dT with increasing field were found. These have been taken as evidence of the superconducting state being successively excited, reentered, and finally exited with increasing field as the sign changes from positive to negative, to positive, and finally to negative. This unusual behavior may result from an interaction of the carriers with Cu2+ ions on the copper-oxygen sheets. These spins exhibit an increasing tendency to antiferromagnetic ordering as the superconductivity of the films is weakened. The presence of many grain boundaries in the films may be the reason the effect is strikingly large.

Original languageEnglish (US)
Pages (from-to)287-295
Number of pages9
JournalPhysica A: Statistical Mechanics and its Applications
Issue number1-4
StatePublished - Nov 15 1993

Bibliographical note

Funding Information:
The authors would like to thank G. Stewart, D. Huse, S. Doniach, V. Emery, L.I. Glazman, J.W. Halley and O.T. Valls for useful discussions.T his work was supportedi n part by the Materials Research Group program of the National Science Foundation under Grant NSF/DMR-8908094, by the Air Force Office of Scientific Researchu nder Grant F49620-93-1-0076a,n d by the Department of Administration of the State of Minnesota. Beauchamp acknowledges support by the American Association of University Women Educational Foundation through an American DissertationF ellowship. Wang acknowledgess upport by the Graduate School of the University of Minnesota through a DissertationF ellowship.


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