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arxiv: 0901.0177 · v2 · submitted 2009-01-01 · ❄️ cond-mat.supr-con · cond-mat.str-el

75As NMR Study of Hole-Doped Superconductor Ba1-xKxFe2As2 (Tc = 38K)

H. Fukazawa , T. Yamazaki , K. Kondo , Y. Kohori , N. Takeshita , P. M. Shirage , K Kihou , K. Miyazawa
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H. Kito H. Eisaki A. Iyo
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classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords superconductingba1-xkxfe2as2differenthole-dopedmeasurementstatesuperconductoraddition
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We report the 75As nuclear magnetic resonance (NMR) measurement of the hole-doped superconductor Ba1-xKxFe2As2 with different lattice parameters and different superconducting volume fractions (Tc = 38K). 75As-NMR spectra revealed that the magnetically ordered and superconducting phases are microscopically separated. The spin-lattice relaxation rate 1/T1 in the normal state reflects the existence of a large two-dimensional antiferromagnetic spin fluctuation. The 1/T1 in the superconducting state down to the lowest measurement temperature T varies close to T^3. In addition, it exhibits no coherence peak just below Tc. This shows a T dependence similar to those of other iron pnictides.

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