@article{fea41511380a4702a91e38935e4b5a9a,
title = "Ultrafast dynamics of quasiparticles and coherent acoustic phonons in slightly underdoped (BaK)Fe2As2",
abstract = "We have utilized ultrafast optical spectroscopy to study carrier dynamics in slightly underdoped (BaK)Fe2As2 crystals without magnetic transition. The photoelastic signals due to coherent acoustic phonons have been quantitatively investigated. According to our temperature-dependent results, we found that the relaxation component of superconducting quasiparticles persisted from the superconducting state up to at least 70 K in the normal state. Our findings suggest that the pseudogaplike feature in the normal state is possibly the precursor of superconductivity. We also highlight that the pseudogap feature of K-doped BaFe2As2 is different from that of other iron-based superconductors, including Co-doped or P-doped BaFe2As2.",
author = "Lin, {Kung Hsuan} and Wang, {Kuan Jen} and Chang, {Chung Chieh} and Wen, {Yu Chieh} and Bing Lv and Chu, {Ching Wu} and Wu, {Maw Kuen}",
note = "Funding Information: The authors would like to thank Yu-Da Chen and Prof. Yia-Chung Chang for ellipsometry measurement. This work is sponsored by Ministry of Science and Technology of Taiwan under Grant Nos: 104-2112-M-001-014-MY3. The work in Houston is supported in part by US Air Force Office of Scientific Research Grants No. FA9550-09-1-0656 and No. FA9550-15-1-0236, the T.L.L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston.",
year = "2016",
month = may,
day = "16",
doi = "10.1038/srep25962",
language = "English",
volume = "6",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
}