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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References
Kuroki, K., et al.: Phys. Rev. Lett. 101, 087004 (2008)
Mazin, I.I., Singh, D.J., Johannes, M.D., Du, M.H.: Phys. Rev. Lett. 101, 057003 (2008)
Cvetkovic, V., Tesanovic, Z.: Europhys. Lett. 85, 37002 (2009)
Ran, Y., Wang, F., Zhai, H., Vishwanath, A., Lee, D.-H.: Phys. Rev. B 79, 014505 (2009)
Harrison, N., Sebastian, S.E.: Phys. Rev. B 80, 224512 (2009)
Morinari, T., Kaneshita, E., Tohyama, T.: Phys. Rev. Lett. 105, 037203 (2010)
Richard, P., et al.: Phys. Rev. Lett. 104, 137001 (2010)
Sugai, S., et al.: J. Phys. Soc. Jpn. 81, 024718 (2012)
Yildirim, T.: Phys. Rev. Lett. 101, 057010 (2008)
Si, Q., Abrahams, E.: Phys. Rev. Lett. 101, 076401 (2008)
Yin, Z.P., et al.: Phys. Rev. Lett. 101, 047001 (2008)
Han, M.J., Yin, Q., Pickett, W.E., Savrasov, S.Y.: Phys. Rev. Lett. 102, 107003 (2009)
Huang, Q., et al.: Phys. Rev. Lett. 101, 257003 (2008)
Rotter, M., et al.: Phys. Rev. B 78, 020503(R) (2008)
Chu, J.-H., Analytis, J.G., Kucharczyk, C., Fisher, I.R.: Phys. Rev. B 79, 014506 (2009)
Zhao, J., et al.: Phys. Rev. Lett. 101, 167203 (2008)
McQueeney, R.J., et al.: Phys. Rev. Lett. 101, 227205 (2008)
Kaneko, K., et al.: Phys. Rev. B 78, 212502 (2008)
Ewings, R.A., et al.: Phys. Rev. B 78, 220501(R) (2008)
Chauvière, L., et al.: Phys. Rev. B 84, 104508 (2011)
Hu, W.Z., et al.: Phys. Rev. Lett. 101, 257005 (2008)
Chauvière, L., et al.: Phys. Rev. B 82, 180521(R) (2010)
Raghu, S., Qi, X.-L., Liu, C.-X., Scalapino, D.J., Zhang, S.-C.: Phys. Rev. B 77, 220503(R) (2008)
Matan, K., Morinaga, R., Iida, K., Sato, T.J.: Phys. Rev. B 79, 054526 (2009)
Fleury, P.A., Porto, S.P.S., Loudon, R.: Phys. Rev. Lett. 18, 658 (1967)
Chen, C.-C., Jia, C.J., Kemper, A.F., Singh, R.R.P., Devereaux, T.P.: Phys. Rev. Lett. 106, 067002 (2011)
Zhao, J., et al.: Nat. Phys. 5, 555 (2009)
Diallo, S.O., et al.: Phys. Rev. Lett. 102, 187206 (2009)
Sugai, S., et al.: Phys. Rev. B 82, 140504(R) (2010)
Kaneshita, E., Tohyama, T.: Phys. Rev. B 82 (2010)
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This work was supported by Transformative Research Project on Iron Pnictides (TRIP), Japan Science and Technology Agency (JST).
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Sugai, S., Mizuno, Y., Watanabe, R. et al. Selective Raman Scattering Detection of the Dirac Node and the Anti-node of the Spin Density Wave Gap and Magnetic Excitations in BaFe2As2 . J Supercond Nov Magn 26, 1179–1183 (2013). https://doi.org/10.1007/s10948-012-1966-6
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DOI: https://doi.org/10.1007/s10948-012-1966-6