M. G. Kim, J. Lamsal, T. W. Heitmann, G. S. Tucker, D. K. Pratt, S. N. Khan, Y. B. Lee, A. Alam, A. Thaler, N. Ni, S. Ran, S. L. Bud'ko, K. J. Marty, M. D. Lumsden, P. C. Canfield, B. N. Harmon, D. D. Johnson, A. Kreyssig, R. J. McQueeney, A. I. Goldman
Neutron diffraction experiments show that the appearance of incommensurate spin-density wave order and the suppression of ordered magnetism in Co and Ni substituted BaFe2As2 appear consistent with a simple band-filling model. For Cu, however, the magnetic phase diagram does not display incommensurate order demonstrating that a rigid-band approach breaks down. Motivated by the observed differences in magnetic ordering and strong suppression of superconductivity with Cu substitution, we performed inelastic magnetic scattering measurements on Ba(Fe1-xMx)2As2 (M = Co, Cu) which show that the normal state spin fluctuation spectra are indistinguishable. These results suggest that impurity effects in the Fe plane play a significant role in controlling magnetism and the appearance of superconductivity.
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http://arxiv.org/abs/1204.1538
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