Mott behavior in KxFe2−ySe2 superconductors studied by pump-probe spectroscopy
Wei Li, Chunfeng Zhang, Shenghua Liu, Xiaxin Ding, Xuewei Wu, Xiaoyong Wang, Hai-Hu Wen, Min Xiao
DOI 10.1103/PhysRevB.89.134515 · Physical Review B
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Abstract
We report on a signature indicating a transition to the orbital-selective Mott phase in superconducting KxFe2−ySe2 single crystals by employing dual-color pump-probe spectroscopy. In addition to the multiexponential-decay recovery dynamics of photoinduced quasiparticles, a damped oscillatory component caused by coherent acoustic phonons emerges when the superconducting phase is suppressed at an increased temperature or excitation power. Upon raising the temperature to 150–170 K, the oscillatory component diminishes alongside a significant enhancement of the slow decay component in the recovery traces. These results can be understood as a gap opening in certain k directions, indicating that a vital role is played by electron correlation in iron-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KxFe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
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