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A Mossbauer spectroscopy study of antiferromagnetism in quenched YBa2Cu2.88Fe0.12O6+x samples

Samples of YBa2Cu2.88Fe0.12O6+x quenched at different temperatures were investigated by Mossbauer spectroscopy at room temperature. Dynamic measurement on the 950 degrees C quenched sample was also performed between 78 and 300 K. The magnetic splitting corresponding to antiferromagnetism can be observed for the high-temperature ( >850 degrees C) quenched samples, whereas no magnetic splitting occurs for the low-temperature quenched samples. Such results indicate a close relationship between the oxygen concentration and antiferromagnetism. The large value of the hyperfine field implies that the antiferromagnetic interaction is rather strong. For the 950 degrees C quenched sample, the fitted hyperfine field exhibits linear dependence on the temperature (78-300 K). The mechanism leading to antiferromagnetism is discussed.