Multigap superconductivity in sesquicarbides La2C3 and Y2C3.
A complex structure of the superconducting order parameter in Ln2C3 (Ln=La,Y) is demonstrated by muon spin relaxation measurements in their mixed state. The muon depolarization rate sigma v(T)] exhibits a characteristic temperature dependence that can be perfectly described by a phenomenological double-gap model for nodeless superconductivity. While the magnitude of two gaps is similar between La2C3 and Y2C3, a significant difference in the interband coupling between those two cases is clearly observed in the behavior of sigma v(T).
Kuroiwa
S
S
Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara, Kanagawa 229-8558, Japan.
Saura
Y
Y
Akimitsu
J
J
Hiraishi
M
M
Miyazaki
M
M
Satoh
K H
KH
Takeshita
S
S
Kadono
R
R