Experimental Evidences for Static Charge Density Waves in Iron Oxy-pnictides

Abstract

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.

arXiv commentTo be published in the Physical Review Letters

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Cited by in corpus (6)

• Iron-based superconductors: tales from the nuclei
• Dimensionality, nematicity and Superconductivity in Fe-based systems
• Intrinsic charge dynamics in high-Tc AFeAs(O,F) superconductors
• Fast recovery of the pristine magnetic and structural phases in superconducting LaFeAsO${}_{0.89}$F${}_{0.11}$ by Mn/Fe substitution
• Structural investigation of the Sm(Fe1-xRux)As(O0.85F0.15) system: a synchrotron X-ray powder diffraction study
• Driven charge density modulation by spin density wave and their coexistence interplay in SmFeAsO: A first-principles study