Structural and magnetic evolution of Sr site electron doping in Sr 2FeMoO 6

摘要

Highlights?Fe/Mo degree decreases from 91.72% to 83.22%.?The B-site cation order degree decreases linearly withx.?The magnetic properties of (Sr2–3xGdxBa2x) FeMoO6are sensitive to cation adulteration.?Antisite defect is the main reason for the saturation magnetic moment.AbstractCation-doped (Sr2–3xGdxBa2x) FeMoO6(x=?0.00, 0.05, 0.10, 0.20, 0.25) compounds were synthesized via a standard high-temperature solid-state reaction. The crystal structure and magnetic properties of these samples were analyzed. X-ray powder diffraction analysis showed that all samples are single phase and belong to the I4/m space group. The order degree of Fe/Mo decreased from 91.72% to 83.22%. Magnetic measurements showed that all samples underwent paramagnetic to ferromagnetic (FM) phase transition near the Curie temperature (TC). The main reason for TCreduction could be antisite defect detected by establishing the derivativedM/dT. All samples exhibited FM characteristics by detecting the hysteresis loops of (Sr2–3xGdxBa2x) FeMoO6at 5?K. The configuration scheme of the unit moment for (Sr2–3xGdxBa2x) FeMoO6can be deduced by magnetic measurement.]]>