Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-12
J. Phys. Soc. Jpn. 78, 103702 (2009)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, 1 table
Scientific paper
10.1143/JPSJ.78.103702
We present $^{57}$Fe-NMR measurements of the novel normal and superconducting-state characteristics of the iron-arsenide superconductor Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ ($T_c$ = 38 K). In the normal state, the measured Knight shift and nuclear spin-lattice relaxation rate $(1/T_1)$ demonstrate the development of wave-number ($q$)-dependent spin fluctuations, except at $q$ = 0, which may originate from the nesting across the disconnected Fermi surfaces. In the superconducting state, the spin component in the $^{57}$Fe-Knight shift decreases to almost zero at low temperatures, evidencing a spin-singlet superconducting state. The $^{57}$Fe-$1/T_1$ results are totally consistent with a $s^\pm$-wave model with multiple full gaps, regardless of doping with either electrons or holes.
Eisaki Hiroshi
Iyo Akira
Kiho K.
Kitaoka Yoshio
Kito Hideo
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