%0 Journal Article
%T Uniaxial pressure effect on structural and magnetic phase transitions in NaFeAs and its comparison with as-grown and annealed BaFe$_2$As$_2$
%A Yu Song
%A Scott V. Carr
%A Xingye Lu
%A Chenglin Zhang
%A Zachary C. Sims
%A N. F. Luttrell
%A Songxue Chi
%A Yang Zhao
%A Jeffrey W. Lynn
%A Pengcheng Dai
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevB.87.184511
%X We use neutron scattering to study the effect of uniaxial pressure on the tetragonal-to-orthorhombic structural ($T_s$) and paramagnetic-to-antiferromagnetic ($T_N$) phase transitions in NaFeAs and compare the outcome with similar measurements on as-grown and annealed BaFe$_2$As$_2$. In previous work on as-grown BaFe$_2$As$_2$, uniaxial pressure necessary to detwin the sample was found to induce a significant increase in zero pressure $T_N$ and $T_s$. However, we find that similar uniaxial pressure used to detwin NaFeAs and annealed BaFe$_2$As$_2$ has a very small effect on their $T_N$ and $T_s$.Since transport measurements on these samples still reveal resistivity anisotropy above $T_N$ and $T_s$, we conclude that such anisotropy cannot be due to uniaxial strain induced $T_N$ and $T_s$ shifts, but must arise from intrinsic electronic anisotropy in these materials.
%U http://arxiv.org/abs/1304.5794v1