Superconducting, magnetic, and non-Fermi-liquid-like ground states evolve in 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 is fundamentally different from a nonsuperconducting sample with 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.
- Received 10 April 2000
- Published in the issue dated 1 June 2000
© 2000 The American Physical Society