High-pressure high-temperature synthesis and magnetic properties of ordered perovskite Sr2Cu(Re0.69-xWxCa0.31)O6 (0≤x≤0.6).

We report the synthesis and magnetic properties of polycrystalline Sr2Cu(Re0.69-xWxCa0.31)O6 samples with x=0, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6, which were prepared by high-pressure high-temperature synthesis technique. These phases had ordered cubic perovskite structures. The pristine compound (x=0) underwent a ferromagnetic (ferrimagnetic) transition with TC∼460 K. The ferromagnetism was suppressed by the W substitution and disappears almost completely for x=0.6. Mechanism of the suppression of the magnetism is discussed assuming a localized electron system. [ABSTRACT FROM AUTHOR]