Abstract
A detailed study of the high-temperature magnetic susceptibility of the ceramic compound YBa 2(Cu 1− x Fe x ) 3O 6+ y , where x=0.03, 0.09 and 0.15, has been undertaken using a Faraday balance. In-situ thermal cycling in a vacuum of 6×10 -6 mbar enabled reduction of the oxygen content to low values of y while monitoring the normal state magnetic properties. At increased Fe dopant levels a kink was superimposed on the Curie-Weiss susceptibility at low oxygen contents. This susceptibility anomaly occurred at 400–430 K, the antiferromagnetic ordering temperature of YBa 2Cu 3O 6. The possibility of enhanced antiferromagnetism due to Fe doping is discussed.
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