Volume 99, Number 1, July 2012
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||10 July 2012|
Mn local moments prevent superconductivity in iron pnictides Ba(Fe1−xMnx)2As2
1 Laboratoire de Physique des Solides, Univ. Paris-Sud, UMR8502, CNRS - F-91405 Orsay Cedex, France, EU
2 Institut Universitaire de France - 103 Boulevard Saint-Michel, F-75005 Paris, France, EU
3 Max Planck Institute for Solid State Research - Heisenbergstrasse 1, D-70569 Stuttgart, Germany, EU
Received: 13 June 2012
Accepted: 14 June 2012
75As nuclear magnetic resonance (NMR) experiments were performed on Ba(Fe1−xMnx)2As2 (xMn = 2.5%, 5% and 12%) single crystals. The Fe layer magnetic susceptibility far from Mn atoms is probed by the 75As NMR line shift and is found similar to that of BaFe2As2, implying that Mn does not induce charge doping. A satellite line associated with the Mn nearest neighbours (n.n.) of 75As displays a Curie-Weiss shift which demonstrates that Mn carries a local magnetic moment. This is confirmed by the main line broadening typical of a RKKY-like Mn-induced staggered spin polarization. The Mn moment is due to the localization of the additional Mn hole. These findings explain why Mn does not induce superconductivity in the pnictides contrary to other dopants such as Co, Ni, Ru or K.
PACS: 74.70.Xa – Pnictides and chalcogenides / 76.60.-k – Nuclear magnetic resonance and relaxation / 75.30.Hx – Magnetic impurity interactions
© EPLA, 2012
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