| Autor: |
Kouchi, Takayoshi, Yashima, Mitsuharu, Mukuda, Hidekazu, Ishida, Shigeyuki, Eisaki, Hiroshi, Yoshida, Yoshiyuki, Kawashima, Kenji, Iyo, Akira |
| Zdroj: |
Journal of the Physical Society of Japan; 2019, Vol. 88 Issue 11, p1-5, 5p |
| Abstrakt: |
We report 75As-NMR/NQR results on new iron-arsenide compounds (La0.5−xNa0.5+x)Fe2As2. The parent compound x = 0 exhibits a stripe-type antiferromagnetic (AFM) order below TN = 130 K. The measurement of nuclear spin relaxation rate at hole-doped x = +0.3 and heavily electron-doped x = −0.5 revealed that the normal-state properties are dominated by AFM spin fluctuations (AFMSFs), which are more significant at x = +0.3 than at x = −0.5. Their superconducting (SC) phases are characterized by unconventional multi-gap SC state, where the smaller SC gaps are particularly weaken in common. The experimental results indicate the close relationship between the AFMSFs and the SC from the hole-doped state to heavily electron-doped state, which shed light on a unique SC phase emerged in the heavily electron-doped regime being formally equivalent to non-SC compound Ba(Fe0.5Co0.5)2As2. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
