Evidence for high-frequency phonon mediated S-wave superconductivity: (formula presented) NMR study of Al-doped (formula presented)

H. Kotegawa, K. Ishida, Y. Kitaoka, T. Muranaka, N. Nakagawa, H. Takagiwa, Jun Akimitsu

Research output: Contribution to journalArticle

Abstract

We report (formula presented) NMR studies that address the underlying two superconducting (SC) gaps model and a possible mechanism for interpreting a high SC transition temperature (formula presented) of (formula presented) in a recently discovered (formula presented) We reported in a previous paper [Phys. Rev. Lett. (formula presented) 127001 (2001)] that the results of the nuclear-spin-lattice relaxation rate, (formula presented) in the SC state revealed the existence of a single large SC gap with (formula presented) This conclusion is corroborated by the calculation that any two-gap models cannot account for the experimental results. In Al-doped (formula presented) the result of (formula presented) in the SC state revealed that a size in the SC gap is not changed by substituting Al for Mg. The reduction in (formula presented) by Al doping is shown to be due to the decrease of the density of states (formula presented) at the Fermi level. According to the McMillan equation, an experimental relation between (formula presented) and the relative change in (formula presented) allowed us to estimate a characteristic phonon frequency (formula presented) and an electron-phonon coupling constant (formula presented) These results suggest that the high- (formula presented) superconductivity in (formula presented) is mediated by the strong electron-phonon coupling with high-frequency phonons.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number6
DOIs
Publication statusPublished - Jan 1 2002
Externally publishedYes

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Superconductivity
S waves
superconductivity
Nuclear magnetic resonance
nuclear magnetic resonance
Spin-lattice relaxation
Electrons
Phonons
Fermi level
Superconducting transition temperature
Doping (additives)
spin-lattice relaxation
nuclear spin

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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Evidence for high-frequency phonon mediated S-wave superconductivity : (formula presented) NMR study of Al-doped (formula presented). / Kotegawa, H.; Ishida, K.; Kitaoka, Y.; Muranaka, T.; Nakagawa, N.; Takagiwa, H.; Akimitsu, Jun.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 66, No. 6, 01.01.2002, p. 1-6.

Research output: Contribution to journalArticle

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