As-75 NMR Study of Hole-Doped Superconductor Ba1-xKxFe2As2 (T-c similar or equal to 38 K)

作者：Fukazawa Hideto^*; Yamazaki Takehiro; Kondo Kenji; Kohori Yoh; Takeshita Nao; Shirage Parasharam M; Kihou Kunihiro; Miyazawa Kiichi; Kito Hijiri; Eisaki Hiroshi; Iyo Akira

来源：Journal of the Physical Society of Japan, 2009, 78(3): 033704.

DOI：10.1143/JPSJ.78.033704

• Ba1-xKxFe2As2
• superconductivity
• magnetic order
• phase separation
• nuclear magnetic resonance

We report the As-75 nuclear magnetic resonance (NMR) measurement of the hole doped superconductor Ba1-xKxFe2As2 with different lattice parameters and different superconducting volume fractions (T-c similar or equal to 38 K). As-75-NMR spectra revealed that the magnetically ordered and superconducting phases are microscopically separated. The spin-lattice relaxation rate 1/T-1 in the normal,late reflects the existence of a large two-dimensional antiferromagnetic spin fluctuation. The 1/T-1, in the Superconducting state down to the lowest measurement temperature T vailes close to T-3. In addition, it exhibits no coherence peak just below T-c. This shows a T dependence similar to those of other iron pnictides.

• 出版日期2009-3