75As NMR probe of antiferromagnetic fluctuations in Ba(Fe1-xRux)2As2
Tusharkanti Dey, P. Khuntia, A. V. Mahajan, Shilpam Sharma, A., Bharathi
TL;DR
This study uses 75As NMR to investigate antiferromagnetic fluctuations in Ba(Fe1-xRux)2As2, revealing their potential role in superconductivity, especially near optimal doping where AFM fluctuations intensify.
Contribution
It provides the first detailed NMR analysis of AFM fluctuations across the composition range in Ba(Fe1-xRux)2As2, linking magnetic fluctuations to superconducting properties.
Findings
Conventional Fermi liquid behavior in Ru-end member.
Enhanced AFM fluctuations near optimal doping.
Correlation between AFM fluctuations and superconductivity.
Abstract
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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