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Magnetic Ordering And Negative Thermal Expansion In Prfeaso

机译：Prfeaso中的磁有序和负热膨胀

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We report the structure and magnetism of PrFeAsO, one of the parent phases of the Fe-As family of superconductors, as measured by neutron powder diffraction. In common with other REFeAsO materials, a tetragonal-orthorhombic phase transition is found on cooling below 136 K and striped Fe magnetism with k =(1,0,1) is detected below ～85 K. Our magnetic order-parameter measurements show that the ordered Fe moment along the a axis reaches a maximum at ～40 K, below which an anomalous expansion of the c axis sets in that results in a negative thermal volume expansion of 0.015% at 2 K. We propose that this effect, which is suppressed in superconducting samples, is driven by a delicate interplay between Fe and Pr ordered moments.
机译：我们通过中子粉末衍射测量报告了PrFeAsO的结构和磁性，PrFeAsO是超导体Fe-As家族的母相之一。与其他REFeAsO材料一样，在136 K以下冷却时会发现四方晶相的相变，在〜85 K以下时会检测到k =（1,0,1）的带状Fe磁性。我们的磁序参数测量表明沿a轴有序的Fe矩在〜40 K处达到最大值，低于此值，c轴将出现异常膨胀，从而导致在2 K处的负热体积膨胀为0.015％。我们建议抑制这种效应Fe和Pr有序矩之间的微妙相互作用驱动着超导样品中的原子。

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