Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-10-16
J. Phys.: Condens. Matter 19 (2007) 145279
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 3 figures, proceeding of Highly Frustrated Magnetism 2006,to be published in the Journal of Physics: Condensed Matter
Scientific paper
We have investigated orthorhombic $R$MnO$_{3}$ ($R$=(Gd$_{1-y}$Tb$_{y}$)) crystals near the phase boundary between the paraelectric $A$-type-antiferromagnetic (AF) phase (PA) and the ferroelectric transverse-spiral-AF one (FS). The spiral AF structure breaks inversion symmetry and induces the ferroelectric polarization through the inverse Dzyaloshinskii-Moriya (DM) interaction. We have found that the PA-FS phase boundary is located at around 0.15$<$$y$$<$0.2. In $y$=0.15 compound, PA and FS phases appear in cooling scan, while FS is not observed in warming scan. This result suggests that FS observed in $y$=0.15 is a metastable state arising from the competition between PA and FS. Furthermore, we demonstrate the phase control between these competing phases by the application of the external magnetic field and external quasihydrostatic pressure.
Akahoshi Daisuke
Akaki Mitsuru
Kuwahara Hideki
Nakamura Fumihiko
Noda Kazufusa
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