Experimental Evidence for Static Charge Density Waves in Iron Oxypnictides
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AbstractIn 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.
CitationMartinelli A, Manfrinetti P, Provino A, Genovese A, Caglieris F, et al. (2017) Experimental Evidence for Static Charge Density Waves in Iron Oxypnictides. Physical Review Letters 118. Available: http://dx.doi.org/10.1103/PhysRevLett.118.055701.
SponsorsThe 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).
PublisherAmerican Physical Society (APS)
JournalPhysical Review Letters