Magnetically driven suppression of nematic order in an iron-based superconductor

S. Avci, O. Chmaissem, J.M. Allred, Stephanie Rosenkranz, I. Eremin, A.V. Chubukov, D.E. Bugaris, D.Y. Chung, M.G. Kanatzidis, Castellan J.-P, J.A. Schlueter, H. Claus, D.D. Khalyavin, P. Manuel, A. Daoud-Aladine and R. Osborn ()
Additional contact information
S. Avci: Argonne National Laboratory
O. Chmaissem: Argonne National Laboratory
J.M. Allred: Argonne National Laboratory
I. Eremin: Institut für Theoretische Physik III, Ruhr-Universität Bochum
A.V. Chubukov: University of Wisconsin-Madison
D.E. Bugaris: Argonne National Laboratory
D.Y. Chung: Argonne National Laboratory
M.G. Kanatzidis: Argonne National Laboratory
Castellan J.-P: Argonne National Laboratory
J.A. Schlueter: Argonne National Laboratory
H. Claus: Argonne National Laboratory
D.D. Khalyavin: ISIS Pulsed Neutron and Muon Facility, Rutherford Appleton Laboratory
P. Manuel: ISIS Pulsed Neutron and Muon Facility, Rutherford Appleton Laboratory
A. Daoud-Aladine: ISIS Pulsed Neutron and Muon Facility, Rutherford Appleton Laboratory
R. Osborn: Argonne National Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract A theory of superconductivity in the iron-based materials requires an understanding of the phase diagram of the normal state. In these compounds, superconductivity emerges when stripe spin density wave (SDW) order is suppressed by doping, pressure or atomic disorder. This magnetic order is often pre-empted by nematic order, whose origin is yet to be resolved. One scenario is that nematic order is driven by orbital ordering of the iron 3d electrons that triggers stripe SDW order. Another is that magnetic interactions produce a spin-nematic phase, which then induces orbital order. Here we report the observation by neutron powder diffraction of an additional fourfold-symmetric phase in Ba1−xNaxFe2As2 close to the suppression of SDW order, which is consistent with the predictions of magnetically driven models of nematic order.

Date: 2014
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DOI: 10.1038/ncomms4845

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