Magnetization and specific heat of La doped Sr2FeMoO6

Abstract

We present high-temperature magnetization and low-temperature specific heat measurements performed on the electron doped double perovskite Sr1.7La0.3FeMoO6. We have obtained the electronic contribution to Cp, γ=11.5(5) mJ/mol K2. The electronic susceptibility, derived from the magnetic measurements in the paramagnetic regime (T>Tc=390 K), was χe0=(4.9±1.5)×10−4 emu/mol. Antiferromagnetic coupling between localized and itinerant moments was inferred from the data, with a coupling constant λ=−(475±50) mol/emu, that results in a ferromagnetic-like Curie–Weiss susceptibility with Θ=390(5) K. These results are compared with those obtained for the undoped material.