A polycrystalline sample of Sr2ScFeAsO3 was studied by 57Fe Mössbauer spectroscopy down to 1.7 K. In contrast to the earlier Mössbauer data, the obtained in this work results indicate that Sr2ScFeAsO3 is in paramagnetic state down to 10 K, while the spectra recorded at 4.6 K and 1.7 K show a weak magnetic order of Fe moments in the Fe2As2 layers. Temperature dependences of isomer shift and quadrupole splitting/shift are compared with specific heat and electrical resistivity data from earlier investigations revealing different local Debye temperatures for the Fe2As2 and perovskite-related Sr2ScO3 layers. Finally, a fast decrease of the carrier density was observed below 80 K and this effect seems to be responsible for the absence of superconductivity in the studied compound.

中文翻译：

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层状含氧氮化物 Sr2ScFeAsO3 的物理性质：低至 1.7 K 的穆斯堡尔研究。


通过低至 1.7 K 的 57Fe 穆斯堡尔光谱研究了 Sr2ScFeAsO3 的多晶样品。与早期的穆斯堡尔数据相比，本工作中获得的结果表明 Sr2ScFeAsO3 在低至 10 K 时处于顺磁性状态，而在 4.6 K 和 4.6 K 下记录的光谱1.7 K 显示 Fe2As2 层中 Fe 矩的弱磁序。将异构体位移和四极分裂/位移的温度依赖性与早期研究的比热和电阻率数据进行比较，揭示了 Fe2As2 和钙钛矿相关 Sr2ScO3 层的不同局部德拜温度。最后，在低于 80 K 的温度下观察到载流子密度快速下降，这种效应似乎是所研究的化合物不具有超导性的原因。