Magnetic properties of the ferrimagnetic cobaltite CaBaCo4O7

Details Magnetic properties of the ferrimagnetic cobaltite CaBaCo4O7 Magnetic properties of the ferrimagnetic cobaltite CaBaCo4O7

2011-04-20

arxiv.org/abs/1104.4032v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 4 figures. To be published in Solid State Communications

Scientific paper

The magnetic properties of the ferrimagnetic cobaltite CaBaCo$_4$O$_7$ are systematically investigated. We find that the susceptibility exhibits a downward deviation below $\sim$ 360 K, suggesting the occurrence of short range magnetic correlations at temperature well above $T_C$. The effective moment is determined to be 4.5 $\mu_B$/f.u, which is consistent with that expected for the Co$^{2+}$/Co$^{3+}$ high spin species. Using a criterion given by Banerjee [Phys. Lett. \textbf{12}, 16 (1964)], we demonstrate that the paramagnetic to ferrimagnetic transition in CaBaCo$_4$O$_7$ has a first order character.

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