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Phys. Rev. Lett. 73, 2752–2755 (1994)

Pair Breaking by Spin-Disorder Scattering at the Antiferromagnetic Transition of the Dy3+ Sublattice of DyBa2Cu3O7-δ Films

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K. M. Beauchamp*, G. C. Spalding, W. H. Huber, and A. M. Goldman
Center for the Science and Application of Superconductivity and School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455

Received 5 April 1994; published in the issue dated 14 November 1994

A peak in the temperature dependence of the resistance of ultrathin, granular DyBa2Cu3O7-δ films has been found near the Néel temperature TN of the Dy3+ sublattice which orders as a 2D Ising antiferromagnet. The shift of the position of the peak to lower temperatures with increasing magnetic field is consistent with it being a signature of TN. These observations are attributed to the suppression of intergranular Josephson coupling by pair breaking, resulting from enhanced intragranular spin-disorder scattering of quasiparticles near the transition.

© 1994 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.73.2752
DOI:
10.1103/PhysRevLett.73.2752
PACS:
74.72.Jt, 74.76.Bz, 75.40.Gb, 75.50.Ee

*Present address: The James Franck Institute, University of Chicago, Chicago, IL 60637.

 
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