ABSTRACT Bilayer molybdate Sr Mo O has been successfully synthesized by a modified solid-state reaction method. Magnetization measurements show that the compound is a paramagnetic material with a weak spin-glass state below about 4.5 K. Fitting to the magnetic susceptibility under a high magnetic field based on the Currie–Weiss law yields a magnetic moment of about 1.61 per Mo atom. The temperature dependence of resistivity exhibits a metallic behaviour in wide temperature region from 20 K to 300 K, but a slight upturn of resistivity with the behaviour of is observed at temperatures below about 20 K. Negative magneto-resistance behaviour has also been observed in the temperature region with resistivity upturning. Both effects indicate that a Kondo-like scattering occurs in the material. Resistivity measurements under high pressures up to 33.7 GPa are carried out, no superconductivity above 2 K has been observed, which is in contradiction to the theoretical prediction. We argue that the absence of superconductivity maybe because the flat-band is still too far away from the Fermi energy.

中文翻译：

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平带双层钼酸盐Sr3Mo2O7的合成、结构和物理性质

摘要 双层钼酸盐 Sr Mo O 已通过改进的固态反应方法成功合成。磁化测量表明，该化合物是一种顺磁性材料，具有低于约 4.5 K 的弱自旋玻璃态。根据 Currie-Weiss 定律拟合高磁场下的磁化率，每个 Mo 原子产生约 1.61 的磁矩。电阻率的温度依赖性在 20 K 到 300 K 的宽温度范围内表现出金属行为，但在低于约 20 K 的温度下观察到电阻率的行为略有上升。 负磁阻行为也在电阻率上升的温度区域。这两种效应都表明材料中发生了类似 Kondo 的散射。在高达 33 的高压下测量电阻率。进行了 7 GPa，没有观察到超过 2 K 的超导性，这与理论预测相矛盾。我们认为没有超导性可能是因为平带距离费米能量还太远。