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Evidence for Two Separate Energy Gaps in Underdoped High-Temperature Cuprate Superconductors from Broadband Infrared Ellipsometry

Základní údaje
Originální název:Evidence for Two Separate Energy Gaps in Underdoped High-Temperature Cuprate Superconductors from Broadband Infrared Ellipsometry
Název česky:Dvě oddělené energiové mezery v poddopovaných vysokoteplotních kuprátových supravodičích pozorované infračervenou elipsometrií
Autoři:Li Yu, Dominik Munzar, A. V. Boris, P. Yordanov, Jiří Chaloupka, Th. Wolf, C. T. Lin, B. Keimer, C. Bernhard
Další údaje
Citace:YU, Li, Dominik MUNZAR, A. V. BORIS, P. YORDANOV, Jiří CHALOUPKA, Th. WOLF, C. T. LIN, B. KEIMER a C. BERNHARD. Evidence for Two Separate Energy Gaps in Underdoped High-Temperature Cuprate Superconductors from Broadband Infrared Ellipsometry. Physical Review Letters, USA: The Americal Physical Society, 2008, roč. 100, č. 17, s. 177004-177007. ISSN 0031-9007.Export BibTeX
@article{771445,
author = {Yu, Li and Munzar, Dominik and Boris, A. V. and Yordanov, P. and Chaloupka, Jiří and Wolf, Th. and Lin, C. T. and Keimer, B. and Bernhard, C.},
article_location = {USA},
article_number = {17},
keywords = {high-temperature superconductivity; cuprates; superconducting gap; pseudogap; c-axis conductivity; infrared ellipsometry},
language = {eng},
issn = {0031-9007},
journal = {Physical Review Letters},
title = {Evidence for Two Separate Energy Gaps in Underdoped High-Temperature Cuprate Superconductors from Broadband Infrared Ellipsometry},
volume = {100},
year = {2008}
}
Originální jazyk:angličtina
Obor:Fyzika pevných látek a magnetismus
Druh:Článek v odborném periodiku
Klíčová slova:high-temperature superconductivity; cuprates; superconducting gap; pseudogap; c-axis conductivity; infrared ellipsometry

We present broadband infrared ellipsometry measurements of the c-axis conductivity of underdoped RBa2Cu3O7-delta (R=Y, Nd, and La) single crystals. Our data show that separate energy scales are underlying the redistributions of spectral weight due to the normal state pseudogap and the superconducting gap. Furthermore, they provide evidence that these gaps do not share the same electronic states and do not merge on the overdoped side. Accordingly, our data are suggestive of a two gap scenario with a pseudogap that is likely extrinsic with respect to superconductivity.

We present broadband infrared ellipsometry measurements of the c-axis conductivity of underdoped RBa2Cu3O7-delta (R=Y, Nd, and La) single crystals. Our data show that separate energy scales are underlying the redistributions of spectral weight due to the normal state pseudogap and the superconducting gap. Furthermore, they provide evidence that these gaps do not share the same electronic states and do not merge on the overdoped side. Accordingly, our data are suggestive of a two gap scenario with a pseudogap that is likely extrinsic with respect to superconductivity.

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