Orbital-Selective Mottness in KxFe2-ySe2 Superconductors Revealed by Pump-Probe Spectroscopy

Revised version: Physical Review B 89, 134515 (2014) We report transient optical signatures of the orbital-selective Mottness in superconducting KxFe2-ySe2 crystals by using dual-color pump-probe spectroscopy. Besides multi-exponential decay recovery dynamics of photo-induced quasiparticles, a dampe...

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Bibliographic Details
Main Authors Li, Wei, Zhang, Chunfeng, Liu, Shenghua, Ding, Xiaxin, Wu, Xuewei, Wang, Xiaoyong, Wen, Hai-Hu, Xiao, Min
Format Journal Article
LanguageEnglish
Published 24.06.2013
Subjects
Physics - Superconductivity
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Summary:Revised version: Physical Review B 89, 134515 (2014) We report transient optical signatures of the orbital-selective Mottness in superconducting KxFe2-ySe2 crystals by using dual-color pump-probe spectroscopy. Besides multi-exponential decay recovery dynamics of photo-induced quasiparticles, a damped oscillatory component due to coherent acoustic phonons emerges when the superconducting phase is suppressed by increasing the temperature or excitation power. The oscillatory component diminishes with significant enhancement of a slow decay component upon raising temperature to 150-160 K. These results are in consistence with the picture of orbital-selective Mott phase transition, indicating a vital role played by electron correlation in the iron-based superconductors.
DOI:10.48550/arxiv.1306.5817