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Field-Induced Metal–Insulator Transition in β-EuP_3

王光强  常国庆  周慧斌  马文龙  林新  M.Zahid Hasan  徐苏扬  贾爽  
【摘要】:Metal-insulator transition(MIT) is one of the most conspicuous phenomena in correlated electron systems.However such a transition has rarely been induced by an external magnetic field as the field scale is normally too small compared with the charge gap.We present the observation of a magnetic-field-driven MIT in a magnetic semiconductor β-EuP_3.Concomitantly,we find a colossal magnetoresistance in an extreme way:the resistance drops billionfold at 2K in a magnetic field less than 3T.We ascribe this striking MIT as a field-driven transition from an antiferromagnetic and paramagnetic insulator to a spin-polarized topological semimetal,in which the spin configuration of Eu~(2+)cations and spin-orbital coupling play a crucial role.As a phosphorene-bearing compound whose electrical properties can be controlled by the application of field,β-EuP_3 may serve as a tantalizing material in the basic research and even future electronics.

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