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Science 19 December 2003:
Vol. 302. no. 5653, p. 2029
DOI: 10.1126/science.302.5653.2029p
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This Week in Science

One approach to studying superconductivity in correlated electron systems is finding common behavior in the phase diagrams of various families of these materials. Yuan et al. (p. 2104) introduce detailed experimental data of the phase diagram of the heavy electron compound, Ge-substituted CeCu2Si2. They provide evidence for two distinct superconducting phases in the material, one based on a magnetic-pairing mechanism near the onset of magnetic ordering, and the other arising close to the vicinity of an abrupt change in the valence density of states. They suggest that both mechanisms may apply more generally to other classes of correlated electron systems.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)