Anomalous Metamagnetism in the Low Carrier Density Kondo Lattice YbRh3Si7
Anomalous Metamagnetism in the Low Carrier Density Kondo Lattice YbRh3Si7
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低载流子密度近藤晶格YbRh3Si7中的反常超磁性
DOI：
10.1103/physrevx.8.041047
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发表时间：
2018
影响因子：
12.5
通讯作者：
Chen, T.
中科院分区：
文献类型：
--
作者：
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.
我们报道了新的低载流子近藤反铁磁体单晶的复杂的变磁相变。电输运、磁化和比热测量揭示了反铁磁有序。中子衍射测量表明，其磁性基态为共线反铁磁体，磁矩在平面上对齐。在这种有序状态下，当沿轴向施加磁场时，不会发生变磁相变。因此，令人惊讶的是，高场磁化、扭矩和电阻率的测量揭示了两个在和的超磁转变。当磁场从轴向平面倾斜时，两个超磁转变都向更高的磁场移动。第一个超磁转变导致电阻率急剧增加，而第二个转变伴随着电阻率的急剧下降。因此，磁自由度和电子自由度是强耦合的。我们讨论了反常超磁性的起源，认为它与晶体电场各向异性和各向异性交换相互作用的竞争有关。
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 ofis a collinear antiferromagnet, where the moments are aligned in theplane. With such an ordered state, no metamagnetic transitions are expected when a magnetic field is applied along theaxis. It is therefore surprising that high-field magnetization, torque, and resistivity measurements withreveal two metamagnetic transitions atand. When the field is tilted away from theaxis, towards theplane, 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 inare 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.