Abstract
Electronic properties including magnetoresistance have been investigated for polycrystals of ordered double perovskite alloy, Sr 2Fe(W 1− x Mo x )O 6. In this system, the ground state changes from an antiferromagnetic insulator to a ferromagnetic metal with increasing x. The magnetization in Sr 2Fe(W 1− x Mo x )O 6 develops by the minimal substitution of W by Mo, and then the conductivity as well as the density of states at the Fermi level grows rapidly with x above 0.25. The present alloy also shows a variety of magnetoresistance behaviors. For example, Sr 2Fe(W 0.4Mo 0.6)O 6 ( x=0.6) exhibits a magnetoresistance (MR) at 4.2 and 300 K as large as 69 and 10%, respectively. Furthermore, Sr 2Fe(W 0.85Mo 0.15)O 6 ( x=0.15), located near the insulator–metal phase boundary, shows an extremely large magnetoresistance as large as 195% at 16 K. The low-field MR can be ascribed to a field suppression of the spin-dependent scattering at the grain or domain boundaries.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
