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Selective Raman Scattering Detection of the Dirac Node and the Anti-node of the Spin Density Wave Gap and Magnetic Excitations in BaFe2As2 |
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| Authors: | S. Sugai Y. Mizuno R. Watanabe T. Kawaguchi K. Takenaka H. Ikuta K. Kiho M. Nakajima C. H. Lee A. Iyo H. Eisaki S. Uchida |
| Affiliation: | 1. Department of Physics, Arts and Science, Petroleum Institute, P.O. Box 2533, Abu Dhabi, United Arab Emirates 2. Department of Physics, Faculty of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan 3. TRIP, Japan Science and Technology Agency (JST), Chiyoda, Tokyo, 102-0075, Japan 4. Department of Crystalline Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan 5. National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, 305-8568, Japan 6. Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo, 113-0033, Japan |
| Abstract: | The electronic and magnetic excitations at the spin density wave (SDW) transition are investigated by Raman scattering. The multi-orbital electronic states induce the Dirac nodes in the SDW gap. The excitations near the nodes and anti-nodes are separately detected in accordance with the two-orbital tight-binding model. The exchange interactions are found to be given by the second derivative of the total energy with respect to the angle of the moment from two-magnon scattering. The two-magnon peak has the large spectral weight above twice the maximum energy of magnon. It is interpreted by the magnetic self-energy of the electron spectral function in the localized spin model or particle-hole excitations in the itinerant spin model. |
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