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Applied Physics Letters / Volume 97 / Issue 9 / DIELECTRICS AND FERROELECTRICITY

Appl. Phys. Lett. 97, 092902 (2010); http://dx.doi.org/10.1063/1.3472269 (3 pages)

Symmetry-mode analysis of the ferroelectric transition in YMnO3

Jinyoung Kim1, Yang Mo Koo1,2, Kee-Sun Sohn3, and Namsoo Shin4

1Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
2Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
3Department of Printed Electronics, Sunchon National University, Chonnam 540-742, Republic of Korea
4Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

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(Received 12 April 2010; accepted 5 July 2010; published online 31 August 2010)

Group theoretical methods were applied to elucidate the structural transition path and the polarization process in YMnO3. The atomic displacements derived from in situ high-temperature synchrotron x-ray powder diffraction data were decomposed into three symmetry-adapted modes (Γ2−, K1, and K3). The temperature dependence of the mode amplitudes confirmed the existence of two step-transitions. First, a coupled K3 and Γ2− mode lowered the symmetry from P63/mmc to P63cm at the phase-transition temperature of ∼ 1270 K, and held down to the TC. A single K3 mode, stabilized by hybridization between the Y and in-plane O ions, operated below TC with no additional symmetry breakage.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

crystal symmetry, dielectric polarisation, ferroelectric Curie temperature, ferroelectric transitions, synchrotron radiation, X-ray diffraction, yttrium compounds

PACS

  • 77.80.B-

    Phase transitions and Curie point

  • 77.22.Ej

    Polarization and depolarization

  • 61.66.Fn

    Inorganic compounds

  • 61.50.Ah

    Theory of crystal structure, crystal symmetry; calculations and modeling

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3472269

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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