Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-08-08
Phys. Rev. B 76, 104405 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 figures
Scientific paper
10.1103/PhysRevB.76.104405
Ferroelectricity is observed in orthorhombic $HoMnO_3$ and $YMnO_3$ at the magnetic lock-in transitions into an E-type structure or an incommensurate phase with a temperature independent wave vector, respectively. In $HoMnO_3$ the ferroelectric polarization strongly depends on the external magnetic field indicating the involvement of the rare earth moment order in this compound. The results are discussed within the framework of recent theoretical models, in particular the double exchange driven polar displacements predicted for E-type magnetic structures.
Chu Cheng-Wei
Lorenz Beat
Wang Yong-Qiang
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