Anomalies in the magnetization of single-crystal BaMn2.49 Ru3.51 O11 at temperatures T1 =183 K, T2 =171 K, and T3 =128 K, signal complex magnetic order induced by competing ferro- and antiferromagnetic correlations and magnetic frustration within the Kagoḿ (hexagonal ab-) plane. The T2 - and T3 -anomalies and unconventional transverse magnetoresistance are observed only for applied field H directed in the Kagoḿ plane, suggesting a topological Hall effect is generated by nonzero scalar chirality of spins canted out of the Kagoḿ plane, but is suppressed in a collinear structure induced by only modest H⊥c. In contrast, the magnetic susceptibility of an isostructural BaFe3.26 Ti2.74 O11 single-crystal reveals magnetic transitions at T1 =250 K and T2 =85 K for H oriented both parallel and perpendicular to the c-axis. The rapid low-field increase of the magnetic moment at μo H<1T, followed by nonsaturation with a near-linear increase at high fields, are typical of a canted antiferromagnet or ferrimagnet.
|Journal||Journal of Applied Physics|
|State||Published - May 1 2010|
Bibliographical noteFunding Information:
Research at the University of Kentucky was supported by U.S. DOE Grant No. DOE-FGØ2-97ER45653.
ASJC Scopus subject areas
- Physics and Astronomy (all)