当前位置: X-MOL 学术Sci. China Phys. Mech. Astronomy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Contrasting physical properties of the trilayer nickelates Nd 4 Ni 3 O 10 and Nd 4 Ni 3 O 8
Science China Physics, Mechanics & Astronomy ( IF 6.4 ) Pub Date : 2020-12-02 , DOI: 10.1007/s11433-020-1613-3
Qing Li , ChengPing He , XiYu Zhu , Jin Si , XinWei Fan , Hai-Hu Wen

We report the crystal structures and physical properties of trilayer nickelates Nd4Ni3O10 and Nd4Ni3O8. Measurements of magnetization and electrical resistivity display contrasting behaviors in the two compounds. Nd4Ni3O10 shows a paramagnetic metallic behavior with a metal-to-metal phase transition (T*) 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 Nd4Ni3O10 is dominated by hole-type charge carriers. The significant enhancement of Hall coefficient and resistivity below T* suggests that effective charge carrier density decreases when cooling through the transition temperature. In contrast, Nd4Ni3O8 shows an insulating behavior. In addition, this compound shows a paramagnetic behavior with the similar magnetic moment as that of Nd4Ni3O10 derived from the Curie-Weiss fitting. This may suggest that the magnetic moments in both systems are contributed by Nd3+ ions. By applying pressures up to about 49 GPa, the insulating behavior is still present and becomes even stronger under a high pressure. Our results suggest that the different Ni configurations (Ni1+/2+ or Ni2+/3+) and the changes of coordination environment of Ni sites may account for the contrasting behaviors in trilayer nickelates Nd4Ni3O10 and Nd4Ni3O8.



中文翻译:

三层镍酸盐Nd 4 Ni 3 O 10和Nd 4 Ni 3 O 8的对比物理性质

我们报告了三层镍酸盐Nd 4 Ni 3 O 10和Nd 4 Ni 3 O 8的晶体结构和物理性质。磁化强度和电阻率的测量显示了两种化合物的对比行为。Nd 4 Ni 3 O 10表现出顺磁金属行为,在162 K左右具有金属到金属的相变(T *),如磁化率和电阻率所揭示。进一步的磁阻和霍尔系数结果表明,在低温和Nd 4 Ni 3 O的载流子类型下为负磁阻10是由空穴型电荷载流子主导。霍尔系数和低于T *的电阻率的显着提高表明,当冷却至转变温度时,有效电荷载流子密度会降低。相反,Nd 4 Ni 3 O 8显示出绝缘行为。另外,该化合物显示出与源自居里-魏斯拟合的Nd 4 Ni 3 O 10具有相似磁矩的顺磁行为。这可能表明两个系统中的磁矩都是由Nd 3+贡献的。离子。通过施加高达49 GPa的压力,绝缘性能仍然存在,并且在高压下甚至变得更强。我们的结果表明,不同的Ni构型(Ni 1 + / 2 +或Ni 2 + / 3 +)和Ni位的配位环境的变化可能解释了三层镍酸盐Nd 4 Ni 3 O 10和Nd 4中的对比行为。Ni 3 O 8

更新日期:2020-12-04
down
wechat
bug