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DOE OSTI2020

Materials Data on Eu(CuO2)2 by Materials Project

Eu(CuO2)2 crystallizes in the tetragonal I4_1/a space group. The structure is three-dimensional. Eu3+ is bonded in a 8-coordinate geometry to eight equivalent O2- atoms. All Eu–O bond lengths are 2.49 Å. Cu+2.50+ is bonded in a square co-planar geometry to four equivalent O2- atoms. There is two shorter (1.88 Å) and two longer (1.90 Å) Cu–O bond length. O2- is bonded to two equivalent Eu3+ and two equivalent Cu+2.50+ atoms to form a mixture of distorted corner and edge-sharing OEu2Cu2 tetrahedra.

36 MATERIALS SCIENCE↗

NASA NTRS1987

Superconductivity above 90 K in the square-planar compound system ABa2Cu3O(6 + x) with A = Y, La, Nd, Sm, Eu, Gd, Ho, Er, and Lu

Superconductivity has been found in the 90-K range in ABa2Cu3O(6 + x) with A = La, Nd, Sm, Eu, Gd, Ho, Er, and Lu in addition to Y. The results suggest that the unique square-planar Cu atoms, each surrounded by four or six oxygen atoms, are crucial to the superconductivity of oxides in general. In particular, the high Tc of ABa2Cu3O(6 + x) is attributed mainly to the quasi-two-dimensional assembly of the CuO2-Ba-CuO(2 + x)Ba-CuO2 layers sandwiched between two A layers, with particular emphasis in the CuO(2 + x) layers. Higher-Tc oxides are predicted for compounds with bigger assemblies of CuO2 layers coupled by Ba layers.

Hor, P. H.↗