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 language | English |
|---|---|
| Pages (from-to) | 1-6 |
| Number of pages | 6 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 66 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Jan 1 2002 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
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 journal › Article
}
TY - JOUR
T1 - Evidence for high-frequency phonon mediated S-wave superconductivity
T2 - (formula presented) NMR study of Al-doped (formula presented)
AU - Kotegawa, H.
AU - Ishida, K.
AU - Kitaoka, Y.
AU - Muranaka, T.
AU - Nakagawa, N.
AU - Takagiwa, H.
AU - Akimitsu, Jun
PY - 2002/1/1
Y1 - 2002/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85038893423&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevB.66.064516
DO - 10.1103/PhysRevB.66.064516
M3 - Article
AN - SCOPUS:85038893423
VL - 66
SP - 1
EP - 6
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 6
ER -