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We use neutron powder diffraction to study on the non-superconducting phasesof ThFeAsN$_{1-x}$O$_x$ with $x=0.15, 0.6$. In our previous results on thesuperconducting phase ThFeAsN with $T_c=$ 30 K, no magnetic transition isobserved by cooling down to 6 K, and possible oxygen occupancy at the nitrogensite is shown in the refinement(H. C. Mao \emph{et al.}, EPL, 117, 57005(2017)). Here, in the oxygen doped system ThFeAsN$_{1-x}$O$_x$, twosuperconducting region ($0\leqslant x \leqslant 0.1$ and $0.25\leqslant x\leqslant 0.55$) have been identified by transport experiments (B. Z. Li\emph{et al.}, J. Phys.: Condens. Matter 30, 255602 (2018)). However, withinthe resolution of our neutron powder diffraction experiment, neither theintermediate doping $x=0.15$ nor the heavily overdoped compound $x= 0.6$ showsany magnetic order from 300 K to 4 K. Therefore, while it shares the commonphenomenon of two superconducting domes as most of 1111-type iron-basedsuperconductors, the magnetically ordered parent compound may not exist in thisnitride family.

Neutron powder diffraction study on the non-superconducting phases of ThFeAsN$_{1-x}$O$_x$ ($x=0.15, 0.6$) iron pnictide