Abstract
We have achieved over 1000% colossal magnetoresistance (CMR) at room temperature by introducing well-controlled disorder to the A-site ordered manganites, Sm 1 - x La x + y Ba 1 - y Mn 2 O 6 . The La-doping to the A-sites (Sm and Ba) of mother compound, SmBaMn 2 O 6 , has mainly three different effects: (1) ionic-size randomness (IR) by Sm(La), (2) charge randomness (CR) by Ba(La) and (3) carrier doping by La/Ba. Any CMR associated with the melting of charge/orbital order (CO) phase by magnetic field is not caused by only IR, because the CO state is very stable in the homogeneous electrostatic potential at the A-site. However, a slight CR destabilizes the CO state and realizes phase separation state between CO and ferromagnetic domains, resulting in an insulator–metal transition under magnetic field, CMR effect. Therefore, the electrostatic potential disorder (CR) at the A-site is an essential role for CMR effect.
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.
