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

Toda, Y.; Mertelj, T.; Naito, T.; Mihailovic, D.

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

Toda, Y.; Mertelj, T.; Naito, T. et al.

Physical Review Letters, 2011, 107(22), 227002

Permalink : https://hdl.handle.net/2115/47741

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アクセス権	open access
URI	https://hdl.handle.net/2115/47741
タイトル	Femtosecond Carrier Relaxation Dynamics and Photoinduced Phase Separation in κ-(BEDT-TTF)2Cu[N(CN)2]X (X = Br, Cl)
著者	Toda, Y. ; Mertelj, T. ; Naito, T. ; Mihailovic, D.
e-Rad_Researcher 00313106 著者名 Toda, Y.
著者名 Mertelj, T.
著者名 Naito, T.
著者名 Mihailovic, D.
言語	英語
発行日	2011-11-25
出版者	American Physical Society
収録物名	Physical Review Letters
巻(号)	107(22)
ページ	227002
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	© 2011 American Physical Society
PISSN	0031-9007
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1103/PhysRevLett.107.227002