Magnetic and magnetotransport properties of intermetallic SmMn 2 Si 2

Jinke Tang, University of Wyoming
M. Zhao, Changchun Institute of Applied Chemistry, People’s Republic of China
C. Sun, Changchun Institute of Applied Chemistry, People’s Republic of China
L. Wang, Changchun Institute of Applied Chemistry, People’s Republic of China
W. Li, Changchun Institute of Applied Chemistry, People’s Republic of China
Q. Su, Changchun Institute of Applied Chemistry, People’s Republic of China
W. Zhao, University of New Orleans

Copyright 1997 AIP (American Institute of Physics) Publishing LLC.

Abstract

The magnetic properties of naturally layered intermetallic compound SmMn2Si2 with textured structure have been studied. There exist a ferromagnetic transition at 35 K and two antiferromagnetic transitions at 120 and 230 K. The antiferromagnetic state below 230 K exhibits different magnetoresistance, with a negative magnetoresistance of 3%–4% for current I applied perpendicular to the c axis and with a positive magnetoresistance effect of about 4%–6% for current I parallel to the c axis. The observed magnetoresistance is likely to be related to magnetovolume effects. In the ferromagnetic state, a positive magnetoresistance with a maximum increase of 22% under an applied field of 5 T is observed at 4 K, and both H ' I and H i I configurations show positive magnetoresistance. © 1997 American Institute of Physics.