Experimental Evidence for Static Charge Density Waves in Iron Oxypnictides
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 2017
- DOI:
- 10.1103/PhysRevLett.118.055701
- arXiv:
- arXiv:1612.04105
- Bibcode:
- 2017PhRvL.118e5701M
- Keywords:
-
- Condensed Matter - Superconductivity
- E-Print:
- To be published in the Physical Review Letters