Abstract
A new oxygen-deficient perovskite, LaSrCuAlO 5, has been prepared. The compound crystallizes in the orthorhombic crystal system with the space group Pbcm. The unit cell dimensions ( Z = 4) are a = 7.9219(6), b = 11.020(1), and c = 5.4235(4) Å. The compound is a layered copper oxide with a structure related to that of the mineral brownmillerite. Important structural features include buckled copper oxygen planes and nonmagnetic, insulating aluminum-oxygen chains that alternate with the copper oxygen planes along the 7.9-Å axis. Resistivity measurements show that LaSrCuAlO 5 is a semiconductor ( ϱ 300 K = 0.065 Ω cm ) and magnetic susceptibility measurements demonstrate that the compound is paramagnetic down to 4 K.
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