Reentrant Spin Glass Behavior in Cr-Doped Perovskite Manganite

Abstract

The magnetic and transport properties of the Cr-doped manganites ${\mathrm{La}}_{0.46}{\mathrm{Sr}}_{0.54}{\mathrm{Mn}}_{1-y}{\mathrm{Cr}}_y{\mathrm{O}}_3$ ( $0\le y\le 0.08$) with the $A$-type antiferromagnetic structure were investigated. Upon cooling, we find multiple magnetic phase transitions, i.e., paramagnetic, ferromagnetic (FM), antiferromagnetic (AFM), and spin glass in the $y=0.02\mathrm{}$ sample. The low temperature spin glass state is not a conventional spin glass with randomly oriented magnetic moments but has a reentrant character. The reentrant spin glass behavior accompanied by the anomalous multiple magnetic transitions might be due to the competing interactions between the FM phase and the $A$-type AFM matrix induced by the random Cr impurity.