Details

Autor(en) / Beteiligte

• El Azrak, A.
• Nahoum, R.
• Bontemps, N.
• Guilloux-Viry, M.
• Thivet, C.
• Perrin, A.
• Labdi, S.
• Li, Z. Z.
• Raffy, H.

Titel

Infrared properties of YBa 2 Cu 3 O 7 and Bi 2 Sr 2 Ca n − 1 Cu n O 2 n + 4 thin films

Ist Teil von

• Physical review. B, 1994-04, Vol.49 (14), p.9846-9856

Ort / Verlag

American Physical Society

Erscheinungsjahr

1994

Quelle

PROLA

Beschreibungen/Notizen

• We report room-temperature optical reflectivity and transmission measurements on a variety ofYBa2Cu307 and Bi2Sr2Can -1CUn02n +4 thin films in the 500-25000 cm-1 frequency range. Reflectivitydata when not biased by the substrate are used to compute the optical conductivity. A comparison ofour results with published reflectivity data on single-domain YBa2Cu307 crystals suggests an overwhelmingcontribution of the CU02 planes {with respect to the chains} to the optical conductivity. The datacan be analyzed in terms of a Drude low-frequency contribution and a so-called midinfrared band. However,the anomalous infrared response appears to be uniquely described by a generalized Drude response:for all the samples investigated, the relaxation rate (which increases linearly with frequency) and theeffective mass are found to be the same as a function of frequency.