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Title: Atomic disorder in the heavy fermion superconductor CeCu{sub 2+x}Si{sub 2}

Abstract

Superconducting, magnetic, and non-Fermi-liquid-like ground states evolve in CeCu{sub 2+x}Si{sub 2} 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. (c) 2000 The American Physical Society.

Authors:
 [1];  [2];  [3];  [4];  [3];  [3];  [3];  [3]
  1. Department of Physics, University of Virginia, Charlottesville, Virginia 22904 (United States)
  2. (United States)
  3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  4. Department of Physics and Astronomy, University of California, Irvine, California 92697 (United States)
Publication Date:
OSTI Identifier:
20216783
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 22; Other Information: PBD: 1 Jun 2000; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERIUM SILICIDES; COPPER SILICIDES; FERMI LEVEL; MAGNETIC PROPERTIES; SUPERCONDUCTIVITY; FERMIONS; NEUTRON DIFFRACTION; ORDER PARAMETERS; GROUND STATES; CRYSTAL-PHASE TRANSFORMATIONS; SPIN-LATTICE RELAXATION; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Louca, Despina, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Thompson, J. D., Lawrence, J. M., Movshovich, R., Petrovic, C., Sarrao, J. L., and Kwei, G. H. Atomic disorder in the heavy fermion superconductor CeCu{sub 2+x}Si{sub 2}. United States: N. p., 2000. Web. doi:10.1103/PhysRevB.61.R14940.
Louca, Despina, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Thompson, J. D., Lawrence, J. M., Movshovich, R., Petrovic, C., Sarrao, J. L., & Kwei, G. H. Atomic disorder in the heavy fermion superconductor CeCu{sub 2+x}Si{sub 2}. United States. doi:10.1103/PhysRevB.61.R14940.
Louca, Despina, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Thompson, J. D., Lawrence, J. M., Movshovich, R., Petrovic, C., Sarrao, J. L., and Kwei, G. H. Thu . "Atomic disorder in the heavy fermion superconductor CeCu{sub 2+x}Si{sub 2}". United States. doi:10.1103/PhysRevB.61.R14940.
@article{osti_20216783,
title = {Atomic disorder in the heavy fermion superconductor CeCu{sub 2+x}Si{sub 2}},
author = {Louca, Despina and Los Alamos National Laboratory, Los Alamos, New Mexico 87545 and Thompson, J. D. and Lawrence, J. M. and Movshovich, R. and Petrovic, C. and Sarrao, J. L. and Kwei, G. H.},
abstractNote = {Superconducting, magnetic, and non-Fermi-liquid-like ground states evolve in CeCu{sub 2+x}Si{sub 2} 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. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevB.61.R14940},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 22,
volume = 61,
place = {United States},
year = {2000},
month = {6}
}