Superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function

Abstract Electron–boson spectral density functions (EBSDFs) can be obtained from measured spectra using various spectroscopic techniques, including optical spectroscopy. EBSDFs, known as glue functions, are suggested to have a magnetic origin. Here, we investigated EBSDFs obtained from the measured...

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Autor principal:	Jungseek Hwang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c466a3b71d1f40c9b449e3d33027fa2c
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spelling	oai:doaj.org-article:c466a3b71d1f40c9b449e3d33027fa2c2021-12-02T18:24:53ZSuperconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function10.1038/s41598-021-91163-w2045-2322https://doaj.org/article/c466a3b71d1f40c9b449e3d33027fa2c2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91163-whttps://doaj.org/toc/2045-2322Abstract Electron–boson spectral density functions (EBSDFs) can be obtained from measured spectra using various spectroscopic techniques, including optical spectroscopy. EBSDFs, known as glue functions, are suggested to have a magnetic origin. Here, we investigated EBSDFs obtained from the measured optical spectra of hole-doped cuprates with wide doping levels, from underdoped to overdoped cuprates. The average frequency of an EBSDF provides the timescale for the spin fluctuations to form Cooper pairs. This timescale is directly associated with retarded interactions between electrons. Using this timescale and Fermi velocity, a reasonable superconducting coherence length, which reflects the size of the Cooper pair, can be extracted. The obtained coherence lengths were consistent with those measured via other experimental techniques. Therefore, the formation of Cooper pairs in cuprates can be explained by spin fluctuations, the timescales of which appear in EBSDFs. Consequently, EBSDFs provide crucial information on the timescale of the microscopic mechanism of Cooper pair formation.Jungseek HwangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jungseek Hwang Superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function
description	Abstract Electron–boson spectral density functions (EBSDFs) can be obtained from measured spectra using various spectroscopic techniques, including optical spectroscopy. EBSDFs, known as glue functions, are suggested to have a magnetic origin. Here, we investigated EBSDFs obtained from the measured optical spectra of hole-doped cuprates with wide doping levels, from underdoped to overdoped cuprates. The average frequency of an EBSDF provides the timescale for the spin fluctuations to form Cooper pairs. This timescale is directly associated with retarded interactions between electrons. Using this timescale and Fermi velocity, a reasonable superconducting coherence length, which reflects the size of the Cooper pair, can be extracted. The obtained coherence lengths were consistent with those measured via other experimental techniques. Therefore, the formation of Cooper pairs in cuprates can be explained by spin fluctuations, the timescales of which appear in EBSDFs. Consequently, EBSDFs provide crucial information on the timescale of the microscopic mechanism of Cooper pair formation.
format	article
author	Jungseek Hwang
author_facet	Jungseek Hwang
author_sort	Jungseek Hwang
title	Superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function
title_short	Superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function
title_full	Superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function
title_fullStr	Superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function
title_full_unstemmed	Superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function
title_sort	superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c466a3b71d1f40c9b449e3d33027fa2c
work_keys_str_mv	AT jungseekhwang superconductingcoherencelengthofholedopedcupratesobtainedfromelectronbosonspectraldensityfunction
_version_	1718378122661855232

Superconducting coherence length of hole-doped cuprates obtained from electron–boson spectral density function

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