Abstract
The effect of Fe doping on the Mn site in the ferromagnetic phases of the perovskite Nd 0.67Sr 0.33Mn 1− x Fe x O 3 ( x⩽0.3) has been studied. Conduction and ferromagnetism are suppressed by Fe doping. The material with x=0.1 shows a spin-glass-like behavior with spin freezing temperature T g=80 K instead of a long-range ferromagnetic order for mother material ( x=0) with T c=260 K, which has been well confirmed by the DC magnetization and nonlinear AC susceptibility measurements. The resistivity for x=0.1 has a very large peak near T g, where a metal–insulator transition seems to take place. Besides, the magnetic field of 7 T causes the colossal magnetoresistance of 97%, which is much larger than 57% for x=0 observed near T c. Further doped materials with x=0.2 and 0.3 show the typical spin glass and insulating behaviors with very small magnetoresistance. These results are ascribed to the frustration of random competing ferromagnetic and antiferromagnetic interactions with the introduction of Fe 3+ ions, which do not participate in the double-exchange process.
Sign-in/Register to access full text options 
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.
