Ultrafast dynamics of quasiparticles and coherent acoustic phonons in slightly underdoped (BaK)Fe2As2

Kung Hsuan Lin, Kuan Jen Wang, Chung Chieh Chang, Yu Chieh Wen, Bing Lv, Ching Wu Chu, Maw Kuen Wu

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3 Citations (Scopus)

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.

Original languageEnglish
Article number25962
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - May 16 2016
Externally publishedYes

ASJC Scopus subject areas

  • General

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    Lin, K. H., Wang, K. J., Chang, C. C., Wen, Y. C., Lv, B., Chu, C. W., & Wu, M. K. (2016). Ultrafast dynamics of quasiparticles and coherent acoustic phonons in slightly underdoped (BaK)Fe2As2. Scientific Reports, 6, [25962]. https://doi.org/10.1038/srep25962