Structures and electromagnetic properties of the A-site ordered/disordered manganites; RBaMn2O6/R0.5Ba0.5MnO3 (R = Y and rare earth elements)

T. Nakajima; Y. Ueda

paper

Structures and electromagnetic properties of the A-site ordered/disordered manganites; RBaMn2O6/R0.5Ba0.5MnO3 (R = Y and rare earth elements)

arXiv:cond-mat/0307456

Abstract

The discovery of novel structural and physical properties in the $A$ -site ordered manganite $R$ BaMn $_{2}$ O $_{6}$ ( $R$ = Y and rare earth elements) has demanded new comprehension about perovskite manganese oxides. In the present study, the $A$ -site disordered form $R$ $_{0.5}$ Ba $_{0.5}$ MnO $_{3}$ was successfully synthesized and compared with $R$ BaMn $_{2}$ O $_{6}$ in the structures and electromagnetic properties. $R$ $_{0.5}$ Ba $_{0.5}$ MnO $_{3}$ has a primitive cubic perovskite cell. Unexpectedly the magnetic glassy states are dominant as the ground state for $R$ $_{0.5}$ Ba $_{0.5}$ MnO $_{3}$ . A peculiar behavior, the steplike ultrasharp magnetization and resistivity change, has been observed in Pr $_{0.5}$ Ba $_{0.5}$ MnO $_{3}$ .

4 pages, 7 figures, to appear in J. Alloy Compd