Impurity effects on electron-mode coupling in high-temperature superconductors

K. Terashima, H. Matsui, D. Hashimoto, T. Sato, T. Takahashi, H. Ding, T. Yamamoto, K. Kadowaki

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Abstract

Despite years of intensive research on copper oxide superconductors with high transition temperatures (T c ), the driving force of superconductivity has not yet been clarified. Angle-resolved photoemission spectroscopy (ARPES) 1-3 measurements have uncovered an important contribution of lattice vibrations (phonons) to superconductivity, sparking a fierce debate on the nature of the 'glue' - phonons or magnetic excitations - binding together the superconducting Cooper pairs 1-11 . However, it is difficult to distinguish these two pairing forces owing to their similar energy scales. Here, we propose a fresh approach to investigate the origin of many-body interactions in these superconductors: an impurity-substitution effect on the low-energy dynamics, which is a magnetic analogue of the isotope effect used for classical superconductors. Our ARPES results reveal that the impurity-induced changes in the electron self-energy show a good correspondence to those of magnetic excitations 12-18 , indicating the importance of spin fluctuations to electron pairing in the high-T c superconductors.

Original languageEnglish
Pages (from-to)27-31
Number of pages5
JournalNature Physics
Volume2
Issue number1
DOIs
Publication statusPublished - Jan 15 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Terashima, K., Matsui, H., Hashimoto, D., Sato, T., Takahashi, T., Ding, H., Yamamoto, T., & Kadowaki, K. (2006). Impurity effects on electron-mode coupling in high-temperature superconductors. Nature Physics, 2(1), 27-31. https://doi.org/10.1038/nphys200