Electronically driven instabilities and superconductivity in the layered La2−xBaxCuO4 perovskites
Jaejun Yu, A. J. Freeman, J. -H. Xu
DOI 10.1103/PhysRevLett.58.1035 · Physical Review Letters
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Abstract
Body-centered tetragonal La2CuO4 is shown to have its electronic structure and properties dominated by the layered in-plane Cu-3d–O-2p interactions. A strong Fermi surface instability along [110] with ‖q‖=2kF leads, via a soft-phonon mode, to the observed orthorhombic phase and accounts for its semiconducting properties. The addition of divalent metals, i.e., Ba, Sr, suppresses the instability and stabilizes the tetragonal phase where the same soft-phonon branch apparently contributes to a large electron-phonon interaction and a high Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Ba0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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