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# Electronic band properties and superconductivity in $\mathrmLa_2\mathrm-\mathrmy$$\mathrmX_\mathrmy$$\mathrmCuO_4$

Physical Review Letters, Vol. 58 (Mar 1987), pp. 1028-1030, doi:10.1103/physrevlett.58.1028  Key: citeulike:11524222

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### Abstract

The results of electronic-structure calculations for tetragonal La2CuO4 provide insight concerning the origin of high-temperature superconductivity in the La2-yXyCuO4 alloys. A half-filled Cu(3d)-O(2p) band with two-dimensional character and a nearly square Fermi surface produces a Peierls instability for y=0 that opens a semiconductor gap over the Fermi surface. Alloying with divalent or tetravalent atoms should spoil the nesting features while maintaining the strong coupling of O phonons to the conduction electrons.

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