论文标题
对比三层镍的物理属性ND $ _4 $ ni $ _3 $ o $ $ _ {10} $和nd $ _4 $ ni $ _3 $ _3 $ o $ $ _8 $
Contrasting physical properties of the trilayer nickelates Nd$_4$Ni$_3$O$_{10}$ and Nd$_4$Ni$_3$O$_8$
论文作者
论文摘要
我们报告了三层镍的晶体结构和物理特性nd $ _4 $ ni $ _3 $ o $ $ _ {10} $和nd $ _4 $ ni $ _3 $ o $ $ _8 $。磁化和电阻率的测量在两种化合物中显示出对比度行为。 nd $ _4 $ ni $ _3 $ o $ _ {10} $在约162 K处显示出具有金属到金属相变到金属相变（$ t^{\ ast} $）的顺磁金属行为，如磁敏感性和电阻率所示。进一步的磁场和霍尔系数结果表明，低温下具有负磁性，而ND $ _4 $ ni $ _3 $ _3 $ o $ _ {10} $的载体类型由孔型电荷载体主导。霍尔系数和电阻率的显着增强低于$ t {\ ast} $表明，通过过渡温度冷却时有效的电荷载体密度会降低。相比之下，尽管在室温下的电阻率很小，但ND $ _4 $ ni $ _3 $ o $ _8 $显示出绝缘行为。该化合物显示出顺磁性行为，其磁矩与nd $ _4 $ ni $ _3 $ o $ $ _ {10} $中的类似磁矩相似。这可能表明两个系统中的磁矩均由ND离子贡献。通过施加大约49 GPA的压力，绝缘行为仍然存在并变得更强大。 Our results suggest that the different Ni configurations ($Ni^{1+/2+}$ or $Ni^{2+/3+}$) and competition between localized and itinerant electrons may account for the contrasting behaviors in trilayer nickelates Nd$_4$Ni$_3$O$_{10}$ and Nd$_4$Ni$_3$O$_8$.
We report the crystal structures and physical properties of trilayer nickelates Nd$_4$Ni$_3$O$_{10}$ and Nd$_4$Ni$_3$O$_8$. Measurements of magnetization and electrical resistivity display contrasting behaviors in the two compounds. Nd$_4$Ni$_3$O$_{10}$ shows a paramagnetic metallic behavior with a metal to metal phase transition($T^{\ast}$) at about 162 K, as revealed by both magnetic susceptibility and resistivity. Further magnetoresistance and Hall coefficient results show a negative magnetoresistance at low temperatures and the carrier type of Nd$_4$Ni$_3$O$_{10}$ is dominated by hole-type charge carriers. The significant enhancement of Hall coefficient and resistivity below $T^{\ast}$ suggest that effective charge carrier density decreases when cooling through the transition temperature. In contrast, Nd$_4$Ni$_3$O$_8$ shows an insulating behavior despite small value of resistivity at room temperature. The compound shows paramagnetic behavior, with the similar magnetic moments as in Nd$_4$Ni$_3$O$_{10}$ derived from the Curie-Weiss fitting. This may suggest that the magnetic moments in both systems are contributed by the Nd ions. By applying pressures up to about 49 GPa, the insulating behavior is still present and becomes even stronger. Our results suggest that the different Ni configurations ($Ni^{1+/2+}$ or $Ni^{2+/3+}$) and competition between localized and itinerant electrons may account for the contrasting behaviors in trilayer nickelates Nd$_4$Ni$_3$O$_{10}$ and Nd$_4$Ni$_3$O$_8$.
