Experimental Evidence for Static Charge Density Waves in Iron Oxypnictides

A. Martinelli, P. Manfrinetti, A. Provino, Alessandro Genovese, F. Caglieris, G. Lamura, C. Ritter, M. Putti

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    13 Scopus citations


    In this Letter we report high-resolution synchrotron x-ray powder diffraction and transmission electron microscope analysis of Mn-substituted LaFeAsO samples, demonstrating that a static incommensurate modulated structure develops across the low-temperature orthorhombic phase, whose modulation wave vector depends on the Mn content. The incommensurate structural distortion is likely originating from a charge-density-wave instability, a periodic modulation of the density of conduction electrons associated with a modulation of the atomic positions. Our results add a new component in the physics of Fe-based superconductors, indicating that the density wave ordering is charge driven.
    Original languageEnglish (US)
    JournalPhysical Review Letters
    Issue number5
    StatePublished - Jan 31 2017

    Bibliographical note

    KAUST Repository Item: Exported on 2020-10-01
    Acknowledgements: The authors acknowledge the ESRF for synchrotron beam time (proposal HC-1468); A. M. acknowledges Andy Fitch for his kind support and experimental assistance during the data collection at the ID22 beam line of ESRF (proposal HC-1468). This work is partially supported by RIDEIRON project (PRIN No. 2012X3YFZ2).


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