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 引文 斯高帕斯(Scopus)

摘要

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.
原文英語
文章編號25962
期刊Scientific Reports
6
DOIs
出版狀態已發佈 - 五月 16 2016
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ASJC Scopus subject areas

  • 多學科

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