Bi $_{2-x}$ Fe PDMATHAAB Se $_{3-x}$ S $_x$拓扑绝缘体在垂直磁场下的巨纵向负磁阻
Giant longitudinal negative magneto-resistance under perpendicular magnetic field in Bi$_{2-x}$Fe$_x$Se$_{3-x}$S$_x$ Topological insulators
摘要：
研究了Fe和S共掺杂Bi 2Se 3的磁性、磁输运和ARPES。随着掺杂浓度的增加，磁电阻（MR）逐渐减小，在一定的掺杂浓度下，观察到巨负MR，并持续到室温。磁性测量结果表明，Fe掺杂诱导铁磁有序时，观察到负MR。磁有序可以归因于RKKY相互作用。随着掺杂浓度的增加，正的磁电阻再次出现，这可能是由于自旋-轨道耦合的关闭导致非平凡体态的破坏，从而降低了FM有序性。这实际上使导带与Fe自旋去杂交。ARPES数据还表明，超过临界掺杂浓度（x>0.09），非平凡体态被完全破坏。
英文摘要：
The magnetic, magneto-transport and ARPES studies of Fe and S co-doped Bi2Se3 were investigated. With doping concentration magneto-resistance (MR) gradually decreases and for a certain doping concentration giant negative MR is observed which persists up to room temperature. Magnetic measurement indicates that the negative MR is observed when ferromagnetic ordering is induced with Fe doping. The magnetic ordering can be attributed with the RKKY interaction. Positive MR reappears with larger doping concentration which may be attributed to the decrease of FM ordering due to the turning off of the spin-orbit coupling leading to the destruction of non-trivial bulk state. This in-effect de-hybridizes the conduction band with the Fe spin. The ARPES data also indicates that above a critical doping concentration (x>0.09) the non-trivial bulk state is completely destroyed.
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