Ferroelectric ground state and polarization-switching path of orthorhombic YMnO3 with coexisting E-type and cycloidal spin phases
SCIE
SCOPUS
- Title
- Ferroelectric ground state and polarization-switching path of orthorhombic YMnO3 with coexisting E-type and cycloidal spin phases
- Authors
- Lee, JH; Song, S; Jang, HM
- Date Issued
- 2013-07-31
- Publisher
- AMER PHYSICAL SOC
- Abstract
- Orthorhombic YMO3 (o-YMO) is currently being intensively investigated since a single-crystalline thin film of o-YMO recently showed a pronounced degree of magnetoelectric coupling. According to first-principles calculations, the ferroelectric ground state is represented by two degenerate E-type collinear spin configurations with the computed polarization P of similar to 1.4 mu C/cm(2). The bc-cycloidal spin phase is identified as the spin configuration that corresponds to the transition state in the + P <-> -P polarization switching. The remarkable coexistence of the E-type and cycloidal spin phases below similar to 40 K is attributed to a small value of the Kohn-Sham energy difference between these two phases, 2.2 meV per formula unit. A modulated spin structure, which is characterized by the tilting of the Mn-spin vectors to the a-axis direction of Pbnm setting, is proposed to account for the observed strong magnetic-field-dependent polarization in o-YMO.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12287
- DOI
- 10.1103/PHYSREVB.88.014116
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 88, no. 1, 2013-07-31
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