2021/01/26 by Jungseek Hwang
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Boson #Coherence (philosophical gambling strategy) #Coherence length #Condensed matter physics #Cooper pair #Cuprate #Doping #Electron #Electron pair #Magnetic and transport properties of perovskites and related materials #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spectral line #Spectroscopy #Spin (aerodynamics) #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1038/s41598-021-91163-w
published as Scientific Reports 11, 11668 (2021) · 5 pages, 5 figures
arxiv created 2021/01/26 · openalex publication_date 2021/06/03 · arxiv updated 2021/06/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.