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Neutron-diffraction, x-ray absorption, and magnetic susceptibility measurements have been used to characterize the structural and magnetic properties in a 42-mg powder sample of Cm 2 CuO 4 . This curium compound crystallizes in the tetragonal I 4 / m m m space group, and is isostructural with the R 2 CuO 4 ( R = P r - G d ) series that become superconducting upon electron doping. The lattice parameters, Cm-O distance, x-ray-absorption edges, and magnetic susceptibility data indicate that the Cm is trivalent. The Cm spins order antiferromagnetically below 25 K, although the magnetic and chemical unit cells are identical. The spins, which order ferromagnetically within the a - b plane, are antiferromagnetically coupled along the c axis, that is, adjacent planes are coupled antiparallel along c . These results are discussed in terms of the absence of superconductivity in the Th-doped analog.
Physical Review B – American Physical Society (APS)
Published: Aug 1, 1999
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