Observation of Dirac Cone Electronic Dispersion in BaFe2As2

Autor:	Richard, P., Nakayama, K., Sato, T., Neupane, M., Xu, Y. -M., Bowen, J. H., Chen, G. F., Luo, J. L., Wang, N. L., Ding, H., Takahashi, T.
Rok vydání:	2009
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Strongly Correlated Electrons
Zdroj:	Physical Review Letters 104, 137001 (2010)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.104.137001
Popis:	We performed an angle-resolved photoemission spectroscopy study of BaFe2As2, which is the parent compound of the so-called 122 phase of the iron-pnictide high-temperature superconductors. We reveal the existence of a Dirac cone in the electronic structure of this material below the spin-density-wave temperature, which is responsible for small spots of high photoemission intensity at the Fermi level. Our analysis suggests that the cone is slightly anisotropic and its apex is located very near the Fermi level, leading to tiny Fermi surface pockets. Moreover, the bands forming the cone show an anisotropic leading edge gap away from the cone that suggests a nodal spin-density-wave description. Comment: 4 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0909.0574 Zobrazit plný text záznamu View this record from Arxiv