Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-09-17
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 4 figures, to appear in Chem. Mater
Scientific paper
Here we show that the B-site cation (Fe/Mo) ordering in the double-perovskite magnetoresistor, Sr2FeMoO6, is controlled by either kinetics or thermal equilibrium depending on the temperature range. In order to enhance the ordering, long synthesis periods at moderate temperatures are thus required. Employment of a special oxygen-getter-controlled low-O2-pressure encapsulation technique for the sample synthesis enabled us to use long heating periods without evident evaporation of Mo, and thereby reach the thermal equilibrium state and a high degree of B-site cation order. For samples fired at 1150C for long periods (> 36 hours), record-high Ms values of 3.7 ~ 3.9 muB were obtained.
Karppinen Maarit
Motohashi Teruki
Nakamura Jin
Shimada Takashi
Yamauchi Hidetaka
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