Microscopic study of the effect of impurities on the first order spin density wave transition in BaFe${}_2$As${}_2$

Abstract

We report an ${}^{75}$As NMR study of BaFe${}_2$As${}_2$ in both single crystals and polycrystal forms. We find that Sn impurities in the single crystal dramatically alter the low energy spin fluctuations and suppress the ordering temperature from 138 K to 85 K. In contrast to Sn-free samples, we find that the temperature dependence of the ${}^{75}$As NMR spectra and spin lattice relaxation rates reveal a second order phase transition to a state of incommensurate magnetic order.

4 pages, 4 figures ; extensive and significant changes have been made to the previous version, focusing on the effect of impurities on the intrinsic physics

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Cited by in corpus (6)

• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Neutron diffraction on antiferromagnetic ordering in single-crystal BaFe2As2
• Homogeneous vs. inhomogeneous coexistence of magnetic order and superconductivity probed by NMR in Co and K doped iron pnictides
• First order magnetic transition in single crystal CaFe${}_2$As${}_2$ detected by ${}^{75}$As NMR
• Systematic ^{75}As NMR study of the dependence of low-lying excitations on F doping in the iron oxypnictide LaFeAs(O_{1-x}F_{x})
• Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2