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Electronic and magnetic properties of the kagome systems YBaCo4O7 and YBaCo3MO7 (M=Al, Fe)

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Citation

Hollmann, N., Hu, Z., Valldor, M., Maignan, A., Tanaka, A., Hsieh, H. H., et al. (2009). Electronic and magnetic properties of the kagome systems YBaCo4O7 and YBaCo3MO7 (M=Al, Fe). Physical Review B, 80(8): 085111, pp. 1-5. doi:10.1103/PhysRevB.80.085111.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-1032-8
Abstract
We present a combined experimental and theoretical x-ray absorption spectroscopy study of the class of cobaltates YBaCo4O7 and YBaCo3MO7 (M=Al, Fe). The focus is on the local electronic and magnetic properties of the transition metal ions in these geometrically frustrated kagomeacute compounds. For the mixed valence cobaltate YBaCo4O7, both the Co2+ and Co3+ are found to be in the high-spin state. The stability of these high-spin states in tetrahedral coordination is compared with those in the more studied case of octahedral coordination. For the compound YBaCo3FeO7, we find exclusively Co2+ and Fe3+ as charge states.