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Anisotropic character of the metal-to-metal transition inPr4Ni3O10
Physical Review B ( IF 3.7 ) Pub Date : 2020-03-25 , DOI: 10.1103/physrevb.101.104104 Shangxiong Huangfu , Gawryluk Dariusz Jakub , Xiaofu Zhang , Olivier Blacque , Pascal Puphal , Ekaterina Pomjakushina , Fabian O. von Rohr , Andreas Schilling
Physical Review B ( IF 3.7 ) Pub Date : 2020-03-25 , DOI: 10.1103/physrevb.101.104104 Shangxiong Huangfu , Gawryluk Dariusz Jakub , Xiaofu Zhang , Olivier Blacque , Pascal Puphal , Ekaterina Pomjakushina , Fabian O. von Rohr , Andreas Schilling
As a member of the Ruddlesden-Popper series rare-earth-nickelates, consists of infinite quasi-two-dimensional perovskite-like Ni-O based layers. Although a metal-to-metal phase transition at has been revealed by previous studies, a comprehensive study of physical properties associated with this transition has not yet been performed. We have grown single crystals of at high oxygen pressure, and report on the physical properties around that phase transition, such as heat-capacity, electric-transport, and magnetization. We observe a distinctly anisotropic behavior between in-plane and out-of-plane properties: a metal-to-metal transition at within the a-b plane, and a metal-to-insulator-like transition along the axis with decreasing temperature. Moreover, an anisotropic and anomalous negative magnetoresistance is observed at that we attribute to a slight suppression of the first-order transition with magnetic field. The magnetic susceptibility can be well described by a Curie-Weiss law, with different Curie constants and Pauli-spin susceptibilities between the high-temperature and the low-temperature phases. The single crystal x-ray diffraction measurements show a shape variation of the different octahedra from the high-temperature phase to the low-temperature phase. This subtle change of the environment of the Ni sites is likely responsible for the different physical properties at high and low temperatures.
中文翻译:
Pr4Ni3O10中金属向金属过渡的各向异性特征
作为Ruddlesden-Popper的成员 系列稀土镍酸盐, 由无限的准二维钙钛矿状Ni-O基层组成。虽然在先前的研究已经揭示了与这种转变有关的物理性质的综合研究尚未进行。我们已经种植了在高氧气压力下,并报告该相变附近的物理性质,例如热容量,电传输和磁化强度。我们观察到了平面内和平面外特性之间明显的各向异性行为:在ab平面内,并沿金属向绝缘体的过渡轴温度降低。此外,观察到各向异性和反常的负磁阻我们归因于磁场对一阶跃迁的轻微抑制。磁化率可以由居里-魏斯定律很好地描述,在高温和低温相之间具有不同的居里常数和泡利自旋磁化率。单晶X射线衍射测量显示不同形状的变化八面体从高温阶段到低温阶段。Ni位点环境的这种细微变化可能是高温和低温下不同物理性质的原因。
更新日期:2020-03-26
中文翻译:
Pr4Ni3O10中金属向金属过渡的各向异性特征
作为Ruddlesden-Popper的成员 系列稀土镍酸盐, 由无限的准二维钙钛矿状Ni-O基层组成。虽然在先前的研究已经揭示了与这种转变有关的物理性质的综合研究尚未进行。我们已经种植了在高氧气压力下,并报告该相变附近的物理性质,例如热容量,电传输和磁化强度。我们观察到了平面内和平面外特性之间明显的各向异性行为:在ab平面内,并沿金属向绝缘体的过渡轴温度降低。此外,观察到各向异性和反常的负磁阻我们归因于磁场对一阶跃迁的轻微抑制。磁化率可以由居里-魏斯定律很好地描述,在高温和低温相之间具有不同的居里常数和泡利自旋磁化率。单晶X射线衍射测量显示不同形状的变化八面体从高温阶段到低温阶段。Ni位点环境的这种细微变化可能是高温和低温下不同物理性质的原因。