Magnetically-Driven Suppression of Nematic Order in an Iron-Based Superconductor
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. In this article, we report the observation by neutron powder diffraction of an additional four- fold-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.
Keywords
Cite
@article{arxiv.1303.2647,
title = {Magnetically-Driven Suppression of Nematic Order in an Iron-Based Superconductor},
author = {Sevda Avci and Omar Chmaissem and Stephan Rosenkranz and Jared M. Allred and Ilya Eremin and Andrey V. Chubukov and Duck-Young Chung and Mercouri G. Kanatzidis and John-Paul Castellan and John A. Schlueter and Helmut Claus and Dmitry D. Khalyavin and Pascal Manuel and Aziz Daoud-Aladine and Ray Osborn},
journal= {arXiv preprint arXiv:1303.2647},
year = {2015}
}
Comments
Article (6 pages, 3 figures) + Supplementary Information (5 pages, 3 figures)