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The investigation of the CaBaCo4−xFex07 oxide shows that a huge decrease of ferrimagnetism is produced for very low Fe contents (x < 0.05) at the benefit of magnetic phase separation and magnetic frustration. This gigantic effect of iron doping at the Co3+ sites in CaBaCo4O7 is compared to that produced by diamagnetic Ga3+ and Al3+ dopants, showing that the antiferromagnetic interactions between...
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