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

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

2008-07-07

arxiv.org/abs/0807.1084v4

PRB, 78, 212509 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.78.212509

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.

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