Rai Binod K, Chikara S, Ding Xiaxin, Oswald Iain W H, Schönemann R, Loganathan V, Hallas A M, Cao H B, Stavinoha Macy, Chen T, Man Haoran, Carr Scott, Singleton John, Zapf Vivien, Benavides Katherine A, Chan Julia Y, Zhang Q R, Rhodes D, Chiu Y C, Balicas Luis, Aczel A A, Huang Q, Lynn Jeffrey W, Gaudet J, Sokolov D A, Walker H C, Adroja D T, Dai Pengcheng, Nevidomskyy Andriy H, Huang C-L, Morosan E
Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
National High Magnetic Field Laboratory, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Phys Rev X. 2018;8(4). doi: 10.1103/PhysRevX.8.041047.
We report complex metamagnetic transitions in single crystals of the new low carrier Kondo antiferromagnet . Electrical transport, magnetization, and specific heat measurements reveal antiferromagnetic order at . Neutron diffraction measurements show that the magnetic ground state of is a collinear antiferromagnet, where the moments are aligned in the plane. With such an ordered state, no metamagnetic transitions are expected when a magnetic field is applied along the axis. It is therefore surprising that high-field magnetization, torque, and resistivity measurements with reveal two metamagnetic transitions at and . When the field is tilted away from the axis, towards the plane, both metamagnetic transitions are shifted to higher fields. The first metamagnetic transition leads to an abrupt increase in the electrical resistivity, while the second transition is accompanied by a dramatic reduction in the electrical resistivity. Thus, the magnetic and electronic degrees of freedom in are strongly coupled. We discuss the origin of the anomalous metamagnetism and conclude that it is related to competition between crystal electric-field anisotropy and anisotropic exchange interactions.
我们报道了新型低载流子近藤反铁磁体单晶中的复杂变磁转变。电输运、磁化和比热测量揭示了在[具体温度值]存在反铁磁序。中子衍射测量表明[材料名称]的磁基态是共线反铁磁体，其磁矩在[具体平面]内排列。在这样的有序状态下，当沿[具体轴]施加磁场时，预计不会发生变磁转变。因此，令人惊讶的是，利用[具体条件]进行的高场磁化、转矩和电阻率测量揭示了在[具体磁场值1]和[具体磁场值2]处有两个变磁转变。当磁场从[具体轴]倾斜到[具体平面]时，两个变磁转变都向更高磁场移动。第一个变磁转变导致电阻率突然增加，而第二个转变伴随着电阻率急剧降低。因此，[材料名称]中的磁自由度和电子自由度强烈耦合。我们讨论了反常变磁性的起源，并得出结论，它与晶体电场各向异性和各向异性交换相互作用之间的竞争有关。
