Structure, Transport and Magnetic properties in La$_{2x}$Sr$_{2-2x}$Co$_{2x}$Ru$_{2-2x}$O$_{6}$

P. S. R. Murthy; K. R. Priolkar; P. A. Bhobe; A. Das; P. R. Sarode; A. K. Nigam

doi:10.1016/j.jmmm.2010.11.024

paper

Structure, Transport and Magnetic properties in La $_{2 x}$ Sr $_{2 - 2 x}$ Co $_{2 x}$ Ru $_{2 - 2 x}$ O $_{6}$

arXiv:1011.2559 · doi:10.1016/j.jmmm.2010.11.024

Abstract

The perovskite solid solutions of the type La $_{2 x}$ Sr $_{2 - 2 x}$ Co $_{2 x}$ Ru $_{2 - 2 x}$ O $_{6}$ with 0.25 $\leq$ x $\leq$ 0.75 have been investigated for their structural, magnetic and transport properties. All the compounds crystallize in double perovskite structure. The magnetization measurements indicate a complex magnetic ground state with strong competition between ferromagnetic and antiferromagnetic interactions. Resistivity of the compounds is in confirmation with hopping conduction behaviour though differences are noted especially for $x$ = 0.4 and 0.6. Most importantly, low field (50Oe) magnetization measurements display negative magnetization during the zero field cooled cycle. X-ray photoelectron spectroscopy measurements indicate presence of Co $^{2 +}$ /Co $^{3 +}$ and Ru $^{4 +}$ /Ru $^{5 +}$ redox couples in all compositions except $x$ = 0.5. Presence of magnetic ions like Ru $^{4 +}$ and Co $^{3 +}$ gives rise to additional ferromagnetic (Ru-rich) and antiferromagnetic sublattices and also explains the observed negative magnetization.

Accepted for publication in J. Magn. Magn. Mater

Structure, Transport and Magnetic properties in La2x​Sr2−2x​Co2x​Ru2−2x​O6​

Abstract

References in corpus (2)

Structure, Transport and Magnetic properties in La $_{2 x}$ Sr $_{2 - 2 x}$ Co $_{2 x}$ Ru $_{2 - 2 x}$ O $_{6}$