Contrasting physical properties of the trilayer nickelates Nd 4 Ni 3 O 10 and Nd 4 Ni 3 O 8
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bruary 2021 Vol. 64 No. 2: 227411 https://doi.org/10.1007/s11433-020-1613-3
Contrasting physical properties of the trilayer nickelates Nd4Ni3O10 and Nd4Ni3O8 *
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Qing Li, ChengPing He, XiYu Zhu , Jin Si, XinWei Fan, and Hai-Hu Wen
Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China Received June 20, 2020; accepted August 13, 2020; published online December 2, 2020
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 3+ both systems are contributed by Nd ions. By applying pressures up to about 49 GPa, the insulating behavior is still present and 1+/2+ 2+/3+ becomes even stronger under a high pressure. Our results suggest that the different Ni configurations (Ni or Ni ) and the changes of coordination environment of Ni sites may account for the contrasting behaviors in trilayer nickelates Nd4Ni3O10 and Nd4Ni3O8. trilayer nickelate, Nd4Ni3O10 and Nd4Ni3O8, high-pressure study PACS number(s): 61.66.Fn, 71.30.+h, 72.20.-i, 74.70.-b Citation:
Q. Li, C. P. He, X. Y. Zhu, J. Si, X. W. Fan, and H.-H. Wen, Contrasting physical properties of the trilayer nickelates Nd4Ni3O10 and Nd4Ni3O8, Sci. China-Phys. Mech. Astron. 64, 227411 (2021), https://doi.org/10.1007/s11433-020-1613-3
1 Introduction Transition metal oxides with quasi-two-dimensional layered structures often attract special attention in searching for superconductors with high critical temperature (high-TC SCs). The inspiration comes from the discovery of high temperature superconductivity in the copper oxide perovskite La2−xBaxCuO4 by Bednorz and Müller [1]. Later efforts have led to some success, for example, superconductivity with *Corresponding authors (XiYu Zhu, email: [email protected]; Hai-Hu Wen, email: [email protected])
unconventional properties has been observed in 3d/4d transition metal oxides NaxCoO2·yH2O (x∼0.35, y∼1.3) [2], Sr2RuO4 [3] and so on. To find new high-TC SCs, one strategy is to design materials in which electronic and structural fea
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