Huddart B M, Birch M T, Pratt F L, Blundell S J, Porter D G, Clark S J, Wu W, Julian S R, Hatton P D, Lancaster T
Centre for Materials Physics, Durham University, Durham DH1 3LE, United Kingdom.
J Phys Condens Matter. 2019 Jul 17;31(28):285803. doi: 10.1088/1361-648X/ab151f. Epub 2019 Apr 1.
We present the results of x-ray scattering and muon-spin relaxation ([Formula: see text]SR) measurements on the iron-pnictide compound FeCrAs. Polarized non-resonant magnetic x-ray scattering results reveal the 120° periodicity expected from the suggested three-fold symmetric, non-collinear antiferromagnetic structure. [Formula: see text]SR measurements indicate a magnetically ordered phase throughout the bulk of the material below [Formula: see text] K. There are signs of fluctuating magnetism in a narrow range of temperatures above [Formula: see text] involving low-energy excitations, while at temperatures well below [Formula: see text] behaviour characteristic of freezing of dynamics is observed, likely reflecting the effect of disorder in our polycrystalline sample. Using density functional theory we propose a distinct muon stopping site in this compound and assess the degree of distortion induced by the implanted muon.
我们展示了对铁基磷化物化合物FeCrAs进行X射线散射和μ子自旋弛豫（μSR）测量的结果。极化非共振磁X射线散射结果揭示了由所提出的三重对称、非共线反铁磁结构预期的120°周期性。μSR测量表明，在低于[公式：见正文]K的整个材料体相中存在磁有序相。在高于[公式：见正文]的窄温度范围内存在涉及低能激发的磁性波动迹象，而在远低于[公式：见正文]的温度下观察到动力学冻结的行为特征，这可能反映了我们多晶样品中无序的影响。使用密度泛函理论，我们提出了该化合物中一个独特的μ子停止位点，并评估了植入μ子引起的畸变程度。
