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

Autor:	Fukazawa, H., Yamazaki, T., Kondo, K., Kohori, Y., Takeshita, N., Shirage, P. M., Kihou, K, Miyazawa, K., Kito, H., Eisaki, H., Iyo, A.
Rok vydání:	2009
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Strongly Correlated Electrons
Zdroj:	J. Phys. Soc. Jpn. Vol.78 (2009) p033704.
Druh dokumentu:	Working Paper
DOI:	10.1143/JPSJ.78.033704
Popis:	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. Comment: 5 pages, 4 figres, to be published in J. Phys. Soc. Jpn. 78 (2009) No.3 issue
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0901.0177 Zobrazit plný text záznamu View this record from Arxiv