Electronically driven instabilities and superconductivity in the layered La2-xBaxCuO4 perovskites

Jaejun Yu, Arthur J Freeman, J. H. Xu

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Body-centered tetragonal La2CuO4 is shown to have its electronic structure and properties dominated by the layered in-plane Cu-3dO-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.

Original languageEnglish
Pages (from-to)1035-1037
Number of pages3
JournalPhysical Review Letters
Issue number10
Publication statusPublished - 1987


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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