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Atomic disorder in the heavy fermion superconductor CeCu2+xSi2

Phys. Rev. B 61, R14940(R) – Published 1 June 2000
Despina Louca, J. D. Thompson, J. M. Lawrence, R. Movshovich, C. Petrovic, J. L. Sarrao, and G. H. Kwei

Abstract

Superconducting, magnetic, and non-Fermi-liquid-like ground states evolve in CeCu2+xSi2 with small changes in the Ce/Cu ratio that leave the average crystal structure unchanged. We find, however, that the local atomic structure determined by neutron pair density function analysis for a superconducting sample with x=0.33 is fundamentally different from a nonsuperconducting sample with x=-0.08. The local lattice of the Cu-deficient sample exhibits long-range atomic order, while the Cu-rich sample is intrinsically disordered. Spin-lattice coupling in the disordered lattice produces an inhomogeneous magnetic state that allows superconductivity to develop and may contribute to observed non-Fermi-liquid effects.

DOI: http://dx.doi.org/10.1103/PhysRevB.61.R14940

  • Received 10 April 2000
  • Published in the issue dated 1 June 2000

© 2000 The American Physical Society

Authors & Affiliations

Despina Louca1,2, J. D. Thompson2, J. M. Lawrence3, R. Movshovich2, C. Petrovic2, J. L. Sarrao2, and G. H. Kwei2

  • 1Department of Physics, University of Virginia, Charlottesville, Virginia 22904
  • 2Los Alamos National Laboratory, Los Alamos, New Mexico 87545
  • 3Department of Physics and Astronomy, University of California, Irvine, California 92697

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