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Femtosecond Carrier Relaxation Dynamics and Photoinduced Phase Separation in κ-(BEDT-TTF)2Cu[N(CN)2]X (X = Br, Cl)

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Title: Femtosecond Carrier Relaxation Dynamics and Photoinduced Phase Separation in κ-(BEDT-TTF)2Cu[N(CN)2]X (X = Br, Cl)
Authors: Toda, Y. Browse this author →KAKEN DB
Mertelj, T. Browse this author
Naito, T. Browse this author
Mihailovic, D. Browse this author
Issue Date: 25-Nov-2011
Publisher: American Physical Society
Journal Title: Physical Review Letters
Volume: 107
Issue: 22
Start Page: 227002
Publisher DOI: 10.1103/PhysRevLett.107.227002
Abstract: We investigate the relaxation dynamics of nonequilibrium carriers in organic conductors κ-(BEDT-TTF)2Cu[N(CN)2]X (X = Br and Cl) using ultrafast time-resolved optical spectroscopy. The dynamics for both salts show similar temperature dependences, which is well characterized by the carrier relaxation across the pseudogap (PG) of the magnitude ΔPG ≈ 16 meV for Br salt and 7.0 meV for Cl salt. On the other hand, only the Br salt shows an abrupt increase of the decay time at low temperature, indicating an additional decay component associated with the superconducting (SC) gap below Tc. The fluence dependent dynamics at low temperature evidences the superposition of the SC component onto the PG component. These results indicate a metallic-insulating phase separation in the Br salt triggered by photoexcited nonequilibrium carriers.
Rights: © 2011 American Physical Society
Type: article
URI: http://hdl.handle.net/2115/47741
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 戸田 泰則

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