| Literature DB >> 19792665 |
V B Nascimento1, Ang Li, Dilushan R Jayasundara, Yi Xuan, Jared O'Neal, Shuheng Pan, T Y Chien, Biao Hu, X B He, Guorong Li, A S Sefat, M A McGuire, B C Sales, D Mandrus, M H Pan, Jiandi Zhang, R Jin, E W Plummer.
Abstract
BaFe2As2 exhibits properties that are characteristic of the parent compounds of the newly discovered iron (Fe)-based high-T(C) superconductors. By combining real-space imaging of scanning tunneling microscopy and spectroscopy (STM+STS) with momentum-space quantitative low-energy electron diffraction (LEED), we have identified the surface plane of cleaved BaFe2As2 crystals as the As terminated Fe-As layer-the plane where superconductivity occurs. LEED and STM+STS data on the BaFe2As2(001) surface indicate an ordered arsenic (As) terminated metallic surface without reconstruction or lattice distortion. It is surprising that STM images the different Fe-As orbitals associated with the orthorhombic structure, but not the As atoms in the surface plane.Entities:
Year: 2009 PMID： 19792665 DOI： 10.1103/PhysRevLett.103.076104
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161