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THE THIRD GENERATION OF THE DIRAC CONE AS A PROOF OF STACKED 2D ELECTRON SYSTEMS IN IRON PNICTIDES

Published online by Cambridge University Press:  16 March 2012

Koichi Kusakabe
Koichi Kusakabe*
Affiliation:
Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka, 560-8531, Japan
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Abstract

The nodal SDW order parameter on a cylindrical Fermi surface is thought to create the Dirac cone in the metallic ground state of iron pnictides and iron chalcogenides. Confirming appearance of the Dirac cone in DFT-GGA solutions of FeSe, we discuss origin of the bulk SDW order parameter in the stacked two-dimensional electronic system. In a layered system with vanishingly small inter-layer single-particle hopping processes, the exchange channels derived for the inter-plane magnetic interaction is the super-exchange counterpart of the two-particle Coulomb scattering for the pair-hopping channel in the layered superconductivity. The fluctuation reference method of the multi-reference density functional theory concludes existence of the inter-layer super-exchange interaction by the Coulomb off-diagonal elements among orbitals in the semi-metallic band structure. Thus a proof of 2D nature of the third generation Dirac cone in iron pnictides induced by SDW also promotes understanding of the high-temperature superconductivity.

Keywords

electrical propertiesmagnetic propertieslayered
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1393: Symposium L – Topological Insulator Materials , 2012 , mrsf11-1393-l03-06
Copyright
Copyright © Materials Research Society 2012

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