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Microscopic theory of coexistence of superconductivity and antiferromagnetism

1983; American Physical Society; Volume: 28; Issue: 1 Linguagem: Inglês

10.1103/physrevb.28.418

1095-3795

J. Ashkenazi, C.G. Kuper, Amiram Ron,

High-pressure geophysics and materials

A theory of the coexistence of superconductivity and antiferromagnetism is presented. We study the role of the "diagonal" exchange coupling between magnetic ions and conduction electrons, using Eliashberg's formalism. This coupling generates a spatial displacement of the Cooper-paired states, and thus reduces the pairing strength. The reduction is linear in the exchange integral and the staggered magnetization. The theory agrees well with experiment for ${\mathrm{Dy}}_{1.2}$${\mathrm{Mo}}_{6}$${\mathrm{S}}_{8}$ and ${\mathrm{Tb}}_{1.2}$${\mathrm{Mo}}_{6}$${\mathrm{S}}_{8}$.