J. Phys. Soc. Jpn. 81, 054704 (2012) [10 Pages]
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Potential Antiferromagnetic Fluctuations in Hole-Doped Iron-Pnictide Superconductor Ba1-xKxFe2As2 Studied by 75As Nuclear Magnetic Resonance Measurement

Masanori Hirano1, Yuji Yamada1, Taku Saito1, Ryo Nagashima1, Takehisa Konishi2, Tatsuya Toriyama1, Yukinori Ohta1,5, Hideto Fukazawa1,5, Yoh Kohori1,5, Yuji Furukawa3, Kunihiro Kihou4,5, Chul-Ho Lee4,5, Akira Iyo4,5, and Hiroshi Eisaki4,5
+ Affiliations
1Department of Physics, Chiba University, Chiba 263-8522, Japan2Department of Chemistry, Chiba University, Chiba 263-8522, Japan3Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, U.S.A.4National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan5Transformative Research-Project on Iron Pnictides (TRIP), JST, Chiyoda, Tokyo 102-0075, Japan
Received October 27, 2011; Accepted February 13, 2012; Published April 12, 2012

We have performed 75 As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements on single-crystalline Ba 1- x K x Fe 2 As 2 for x = 0.27–1. 75 As nuclear quadruple resonance frequency (ν Q ) increases linearly with increasing x . The Knight shift K in the normal state shows Pauli paramagnetic behavior with a weak temperature T dependence. K increases gradually with increasing x . By contrast, the nuclear spin–lattice relaxation rate 1/ T 1 in the normal state has a strong T dependence, which indicates the existence of large antiferomagnetic (AF) spin fluctuations for all x 's. The T dependence of 1/ T 1 shows a gaplike behavior below approximately 100 K for 0.6 < x < 0.9. This behaviors is well explained by the change in the band structure with the expansion of hole Fermi surfaces and the shrinkage and disappearance of electron Fermi surfaces at the Brillouin zone (BZ) with increasing x . The anisotropy of 1/ T 1 , represented by the ratio of 1/ T 1 a b to 1/ T 1 c , is always larger than 1 for all x 's, which indicates that stripe-type AF fluctuations are dominant in this system. The K in the superconducting (SC) state decreases, which corresponds to the appearance of spin-singlet superconductivity. The T dependence of 1/ T 1 in the SC state indicates a multiple-SC-gap feature. A simple two-gap model analysis shows that the larger superconducting gap gradually decreases with increasing x from 0.27 to 1 and a smaller gap decreases rapidly and nearly vanishes for x > 0.6 where electron pockets in BZ disappear.

©2012 The Physical Society of Japan
https://doi.org/10.1143/JPSJ.81.054704
KEYWORDS: iron pnictide superconductor, nuclear magnetic resonance, nuclear quadrupole resonance, spin fluctuations, superconducting gap

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