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We report transient optical signatures of the orbital-selective Mottness insuperconducting KxFe2-ySe2 crystals by using dual-color pump-probespectroscopy. Besides multi-exponential decay recovery dynamics ofphoto-induced quasiparticles, a damped oscillatory component due to coherentacoustic phonons emerges when the superconducting phase is suppressed byincreasing the temperature or excitation power. The oscillatory componentdiminishes with significant enhancement of a slow decay component upon raisingtemperature to 150-160 K. These results are in consistence with the picture oforbital-selective Mott phase transition, indicating a vital role played byelectron correlation in the iron-based superconductors.

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