Superconductivity in Ferromagnetic RuSr2GdCu2O8
W. E. Pickett, R. Weht, A. B. Shick
DOI 10.1103/PhysRevLett.83.3713 · Physical Review Letters
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Abstract
Relying on the inhomogeneous (layered) crystal, electronic, and magnetic structure, we show how superconductivity can coexist with the ferromagnetic phase of RuSr2GdCu2O8 as observed by Tallon and co-workers. Since the Cu dx2−y2 orbitals couple only to apical O px,py orbitals (and only weakly), which also couple only weakly to the magnetic Ru t2g orbitals, there is sufficiently weak exchange splitting, especially of the symmetric CuO2 bilayer Fermi surface, to allow singlet pairing. The exchange splitting is calculated to be large enough that the superconducting order parameter may be of the Fulde-Ferrell-Larkin-Ovchinnikov type.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | onset |
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