【摘 要】
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We report the crystal structures and physical properties of trilayer nickelates Nd4Ni3O10 and Nd4Ni3O8.Measurements of magnetization and electrical resistivity
【机 构】
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Center for Superconducting Physics and Materials,National Laboratory of Solid State Microstructures
【出 处】
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中国科学：物理学 力学 天文学（英文版）
论文部分内容阅读
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.
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