- Main
Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors.
- Author(s): Pfau, H
- Chen, SD
- Yi, M
- Hashimoto, M
- Rotundu, CR
- Palmstrom, JC
- Chen, T
- Dai, P-C
- Straquadine, J
- Hristov, A
- Birgeneau, RJ
- Fisher, IR
- Lu, D
- Shen, Z-X
- et al.
Published Web Location
https://doi.org/10.1103/physrevlett.123.066402Abstract
The momentum dependence of the nematic order parameter is an important ingredient in the microscopic description of iron-based high-temperature superconductors. While recent reports on FeSe indicate that the nematic order parameter changes sign between electron and hole bands, detailed knowledge is still missing for other compounds. Combining angle-resolved photoemission spectroscopy with uniaxial strain tuning, we measure the nematic band splitting in both FeSe and BaFe_{2}As_{2} without interference from either twinning or magnetic order. We find that the nematic order parameter exhibits the same momentum dependence in both compounds with a sign change between the Brillouin center and the corner. This suggests that the same microscopic mechanism drives the nematic order in spite of the very different phase diagrams.