@article{458fe53da0904858bdbe16c883e9ce20,
title = "Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors",
abstract = "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 BaFe2As2 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.",
author = "H. Pfau and Chen, {S. D.} and M. Yi and M. Hashimoto and Rotundu, {C. R.} and Palmstrom, {J. C.} and T. Chen and Dai, {P. C.} and J. Straquadine and A. Hristov and Birgeneau, {R. J.} and Fisher, {I. R.} and D. Lu and Shen, {Z. X.}",
note = "Funding Information: We are very grateful for valuable discussions with R. Fernendes, A. Kemper, Q. Si, Y. Zhang, and C. Watson. H. P. acknowledges support from the Alexander von Humboldt Foundation and from the German Science Foundation (DFG) under reference PF 947/1-1. J. C. P. is supported by a Gabilan Stanford Graduate Fellowship and a NSF Graduate Research Fellowship (Grant No. DGE-114747). J. S. acknowledges support from an ABB Stanford Graduate Fellowship. This work was supported by the Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-76SF00515. The FeSe single crystal growth and characterization work at Rice was supported by the U.S. DOE, BES DE-SC0012311 and in part by the Robert A. Welch Foundation Grant No. C-1839 (P.-C. D.). Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. Work at Lawrence Berkeley National Laboratory was funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05-CH11231 within the Quantum Materials Program (KC2202). Publisher Copyright: {\textcopyright} 2019 American Physical Society.",
year = "2019",
month = aug,
day = "7",
doi = "10.1103/PhysRevLett.123.066402",
language = "English (US)",
volume = "123",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "6",
}