Atomic disorder in the heavy fermion superconductor CeCu2+xSi2
Despina Louca, J. D. Thompson, J. M. Lawrence, R. Movshovich, C. Petrovic, J. L. Sarrao, G. H. Kwei
DOI 10.1103/PhysRevB.61.R14940 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCu2.33Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.671 | Pressure not reported | onset |
| CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.7 | Pressure not reported | unknown |
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