期刊
PHYSICAL REVIEW B
卷 86, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.220402
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资金
- US Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
- Scientific User Facilities Division
- Center for Integrated Nanotechnologies, a US Department of Energy, Office of Basic Energy Sciences, user facility at Los Alamos National Laboratory
- Ministry of Education, Culture, and Technology, Japan (MEXT)
- Max Planck Society
- Korea Ministry of Education, Science, and Technology (MEST), Gyeongsangbuk-Do, and Pohang City
We have identified the modes of multiferroic BiFeO3 measured by THz and Raman spectroscopies. Excellent agreement with the observed peaks is obtained by including the effects of easy-axis anisotropy along the direction of the electric polarization. By distorting the cycloidal spin state, anisotropy splits the Psi(perpendicular to 1) mode into peaks at 20 and 21.5 cm(-1) and activates the lower Phi(+/- 2) mode at 27 cm(-1) (T = 200 K). An electromagnon is identified with the upper Psi(+/- 1) mode at 21.5 cm(-1). Our results also explain recent inelastic neutron-scattering measurements. DOI:10.1103/PhysRevB.86.220402
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