Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-03-10
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages,4 figures, publised in Physical Review B 78, 092404/2008
Scientific paper
10.1103/PhysRevB.78.092404
We report the magnetic field dependent dc magnetization and the pressure-dependent (pmax ~ 16 kbar) ac susceptibilities Xp(T) on both powder and bulk multiferroic BiMnO3 samples, synthesized in different batches under high pressure. A clear ferromagnetic (FM) transition is observed at TC ~ 100 K, and increases with magnetic field. The magnetic hysteresis behavior is similar to that of a soft ferromagnet. Ac susceptibility data indicate that both the FM peak and its temperature (TC) decrease simultaneously with increasing pressure. Interestingly, above a certain pressure (9 ~ 11 kbar), another peak appears at Tp ~ 93 K, which also decreases with increasing pressure, with both these peaks persisting over some intermediate pressure range (9 ~ 13 kbar). The FM peak disappears with further application of pressure; however, the second peak survives until present pressure limit (pmax ~ 16 kbar). These features are considered to originate from the complex interplay of the magnetic and orbital structure of BiMnO3 being affected by pressure.
Belik Alexei A.
Chou Catherine
Her Jim Long
huang Chia-Ling
Sakurai Haruo
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