75As NMR probe of antiferromagnetic fluctuations in Ba(Fe1-xRux)2As2

Details 75As NMR probe of antiferromagnetic fluctuations in Ba(Fe1-xRux)2As2 75As NMR probe of antiferromagnetic fluctuations in Ba(Fe1-xRux)2As2

2011-01-16

arxiv.org/abs/1101.3086v2

Journal of Physics: Condensed Matter, 23, 475701 (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1088/0953-8984/23/47/475701

The evolution of 75As NMR parameters with composition and temperature was probed in the Ba(Fe1-xRux)2As2 system where Fe is replaced by isovalent Ru. While the Ru-end member was found to be a conventional Fermi liquid, the composition (x=0.5) corresponding to the highest Tc (20K) in this system shows an upturn in 75As 1/T1T below about 80 K evidencing the presence of antiferromagnetic (AFM) fluctuations. These results are similar to those obtained in another system with isovalent substitution BaFe2(As1-xPx)2 [Y. Nakai, T. Iye, S. Kitagawa, K. Ishida, H. Ikeda, S. Kasahara, H. Shishido, T. Shibauchi, Y. Matsuda, and T. Terashima, Phys. Rev. Lett. 105, 107003 (2010)] and point to the possible role of AFM fluctuations in driving superconductivity.

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