No abstract

Neutron diffraction on a single crystal of Gd2CuO4 shows a long-range superstructure of the T′ phase. The oxygen squares surrounding the Cu sites are rotated around the c-axis (by an angle of 5.2° at room temperature) leading to a reduced orthorhombic symmetry (space group: Acam). The reported structural deformation can explain previous results (weak ferromagnetism and Mössbauer effect) and might help to explain the non-existence of superconductivity in Gd2−xCexCuO4.

No abstract