(π, π) electronic order in iron arsenide superconductors.

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Bibliographic Details
Title:	(π, π) electronic order in iron arsenide superconductors.
Authors:	Zabolotnyy, V. B., Inosov, D. S., Evtushinsky, D. V., Koitzsch, A., Kordyuk, A. A., Sun, G. L., Park, J. T., Haug, D., Hinkov, V., Boris, A. V., Lin, C. T., Knupfer, M., Yaresko, A. N., Büchner, B., Varykhalov, A., Follath, R., Borisenko, S. V.
Source:	Nature. 1/29/2009, Vol. 457 Issue 7229, p569-572. 4p. 4 Graphs.
Subjects:	Conduction electrons, Arsenides, Iron compounds, Superconductors, Lattice dynamics, Electron distribution research, Ionic liquids
Abstract:	The distribution of valence electrons in metals usually follows the symmetry of the underlying ionic lattice. Modulations of this distribution often occur when those electrons are not stable with respect to a new electronic order, such as spin or charge density waves. Electron density waves have been observed in many families of superconductors, and are often considered to be essential for superconductivity to exist. Recent measurements seem to show that the properties of the iron pnictides are in good agreement with band structure calculations that do not include additional ordering, implying no relation between density waves and superconductivity in these materials. Here we report that the electronic structure of Ba1-xKxFe2As2 is in sharp disagreement with those band structure calculations, and instead reveals a reconstruction characterized by a (π, π) wavevector. This electronic order coexists with superconductivity and persists up to room temperature (300 K). [ABSTRACT FROM AUTHOR]
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Database:	Psychology and Behavioral Sciences Collection

Description
Abstract:	The distribution of valence electrons in metals usually follows the symmetry of the underlying ionic lattice. Modulations of this distribution often occur when those electrons are not stable with respect to a new electronic order, such as spin or charge density waves. Electron density waves have been observed in many families of superconductors, and are often considered to be essential for superconductivity to exist. Recent measurements seem to show that the properties of the iron pnictides are in good agreement with band structure calculations that do not include additional ordering, implying no relation between density waves and superconductivity in these materials. Here we report that the electronic structure of Ba1-xKxFe2As2 is in sharp disagreement with those band structure calculations, and instead reveals a reconstruction characterized by a (π, π) wavevector. This electronic order coexists with superconductivity and persists up to room temperature (300 K). [ABSTRACT FROM AUTHOR]
ISSN:	00280836
DOI:	10.1038/nature07714