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Experimental determination of the microscopic origin of magnetism in parent iron pnictides

Hsieh, D. and Xia, Y. and Wray, L. and Qian, D. and Gomes, K. and Yazdani, A. and Chen, G. F. and Luo, J. L. and Wang, N. L. and Hasan, M. Z. (2008) Experimental determination of the microscopic origin of magnetism in parent iron pnictides. . (Submitted)

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Like high T_c cuprates, the newly discovered iron based superconductors lie in close proximity to a magnetically ordered parent phase. However, while the magnetic order in parent cuprates is known to derive from a spin-spin local superexchange interaction, a plethora of experiments including neutron scattering have so far been unable to conclusively resolve whether a local moment Heisenberg description applies in parent iron based compounds, or whether magnetism arises from a collective SDW order instability. These two alternatives can in principle be distinguished by measuring the low energy momentum-resolved bulk-representative electronic structure of the magnetically ordered phase. Using a combination of polarization dependent ARPES and STM, we have isolated the complete low-lying bulk representative electronic structure of magnetic SrFe_2As_2 with d-orbital symmetry specificity for the first time. Our results show that while multiple bands with different iron d-orbital character indeed contribute to charge transport, only one pair of bands with opposite mirror symmetries microscopically exhibit an itinerant SDW instability with energy scales on the order of 50 meV. The orbital resolved band topology below T_SDW point uniquely to a nesting driven band hybridization mechanism of the observed antiferromagnetism in the iron pnictides, and is consistent with an unusual anisotropic nodal-density-wave state. In addition, these results place strong constraints on many theories of pnictide superconductivity that require a strict local moment magnetism starting point.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper
Hsieh, D.0000-0002-0812-955X
Additional Information:Imported from arXiv. Submitted on 12 Dec 2008. We thank A. Pasupathy and A. Pushp for assistance with STM measurements. This work is supported by U.S. DOE/BES.
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Department of Energy (DOE)UNSPECIFIED
Record Number:CaltechAUTHORS:20140828-155503695
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49030
Deposited By: Joy Painter
Deposited On:29 Aug 2014 21:17
Last Modified:02 Jun 2023 00:05

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