A New Landscape of Multiple Dispersion Kinks in a High-T c Cuprate Superconductor

Abstract Conventional superconductivity is caused by electron-phonon coupling. The discovery of high-temperature superconductors raised the question of whether such strong electron-phonon coupling is realized in cuprates. Strong coupling with some collective excitation mode has been indicated by a d...

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Autores principales:	H. Anzai, M. Arita, H. Namatame, M. Taniguchi, M. Ishikado, K. Fujita, S. Ishida, S. Uchida, A. Ino
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b54c088a35a6424db3d509d1bcbc69b4
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spelling	oai:doaj.org-article:b54c088a35a6424db3d509d1bcbc69b42021-12-02T15:05:37ZA New Landscape of Multiple Dispersion Kinks in a High-T c Cuprate Superconductor10.1038/s41598-017-04983-02045-2322https://doaj.org/article/b54c088a35a6424db3d509d1bcbc69b42017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04983-0https://doaj.org/toc/2045-2322Abstract Conventional superconductivity is caused by electron-phonon coupling. The discovery of high-temperature superconductors raised the question of whether such strong electron-phonon coupling is realized in cuprates. Strong coupling with some collective excitation mode has been indicated by a dispersion “kink”. However, there is intensive debate regarding whether the relevant coupling mode is a magnetic resonance mode or an oxygen buckling phonon mode. This ambiguity is a consequence of the energy of the main prominent kink. Here, we show a new landscape of dispersion kinks. We report that heavily overdoping a Bi2Sr2CaCu2O8+δ superconductor results in a decline of the conventional main kink and a rise of another sharp kink, along with substantial energy shifts of both. Notably, the latter kink can be ascribed only to an oxygen-breathing phonon. Hence, the multiple phonon branches provide a consistent account of our data set on the multiple kinks. Our results suggest that strong electron-phonon coupling and its dramatic change should be incorporated into or reconciled with scenarios for the evolution of high-T c superconductivity.H. AnzaiM. AritaH. NamatameM. TaniguchiM. IshikadoK. FujitaS. IshidaS. UchidaA. InoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q H. Anzai M. Arita H. Namatame M. Taniguchi M. Ishikado K. Fujita S. Ishida S. Uchida A. Ino A New Landscape of Multiple Dispersion Kinks in a High-T c Cuprate Superconductor
description	Abstract Conventional superconductivity is caused by electron-phonon coupling. The discovery of high-temperature superconductors raised the question of whether such strong electron-phonon coupling is realized in cuprates. Strong coupling with some collective excitation mode has been indicated by a dispersion “kink”. However, there is intensive debate regarding whether the relevant coupling mode is a magnetic resonance mode or an oxygen buckling phonon mode. This ambiguity is a consequence of the energy of the main prominent kink. Here, we show a new landscape of dispersion kinks. We report that heavily overdoping a Bi2Sr2CaCu2O8+δ superconductor results in a decline of the conventional main kink and a rise of another sharp kink, along with substantial energy shifts of both. Notably, the latter kink can be ascribed only to an oxygen-breathing phonon. Hence, the multiple phonon branches provide a consistent account of our data set on the multiple kinks. Our results suggest that strong electron-phonon coupling and its dramatic change should be incorporated into or reconciled with scenarios for the evolution of high-T c superconductivity.
format	article
author	H. Anzai M. Arita H. Namatame M. Taniguchi M. Ishikado K. Fujita S. Ishida S. Uchida A. Ino
author_facet	H. Anzai M. Arita H. Namatame M. Taniguchi M. Ishikado K. Fujita S. Ishida S. Uchida A. Ino
author_sort	H. Anzai
title	A New Landscape of Multiple Dispersion Kinks in a High-T c Cuprate Superconductor
title_short	A New Landscape of Multiple Dispersion Kinks in a High-T c Cuprate Superconductor
title_full	A New Landscape of Multiple Dispersion Kinks in a High-T c Cuprate Superconductor
title_fullStr	A New Landscape of Multiple Dispersion Kinks in a High-T c Cuprate Superconductor
title_full_unstemmed	A New Landscape of Multiple Dispersion Kinks in a High-T c Cuprate Superconductor
title_sort	new landscape of multiple dispersion kinks in a high-t c cuprate superconductor
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/b54c088a35a6424db3d509d1bcbc69b4
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A New Landscape of Multiple Dispersion Kinks in a High-T c Cuprate Superconductor

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