Magnetic behaviour of quasi-one-dimensional oxides, Ca$_3$Co$_(1+x)$Mn$_{1-x}$O$_6$

TL;DR

This study investigates the magnetic properties of Ca$_3$Co$_{1+x}$Mn$_{1-x}$O$_6$ oxides, revealing complex magnetic transitions and ordering behaviors influenced by Co-Mn substitution in a quasi-one-dimensional structure.

Contribution

It provides new insights into how Mn substitution affects magnetic ordering and transitions in Ca$_3$Co$_{1+x}$Mn$_{1-x}$O$_6$, contrasting with previous spin-glass behavior.

Findings

Ca$_3$Co$_2$O$_6$ shows complex magnetic transitions at 24 and 12 K.

Mn substitution leads to antiferromagnetic ordering below 13 and 18 K.

Hysteretic spin reorientation effects are observed.

Abstract

The results of ac and dc magnetization and heat capacity measurements on the oxides, Ca$_3$Co$_{1+x}$Mn$_{1-x}$O$_6$, forming in a K$_4$CdCl$_6$-derived rhombohedral quasi-one-dimensional crystal structure, are reported. As far as Ca$_3$Co$_2$O$_6$ is concerned, the results reveal truly complex nature of the two magnetic transitions, identified to set in at 24 and 12 K in the previous literature. However, partial replacement of Co by Mn apparently results in a long magnetic ordering of an antiferromagnetic type (below 13 and 18 K for x= 0.0 and 0.25 respectively), instead of spin-glass freezing in spite of the fact that there is Co-Mn disorder; in addition, interestingly there are hysteretic spin reorientation effects as revealed by isothermal magnetization behavior.