Quantum Oscillations in Flux-Grown SmB6 with Embedded Aluminum
Quantum Oscillations in Flux-Grown SmB6 with Embedded Aluminum
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DOI：
10.1103/physrevlett.122.166401
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发表时间：
2019-04-23
影响因子：
8.6
通讯作者：
Rosa, P. F. S.
中科院分区：
文献类型：
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作者：
Thomas, S. M.;Ding, Xiaxin;Rosa, P. F. S.
SmB 6是一种候选的拓扑近藤绝缘体，在低温下显示表面导电。在这里，我们进行扭矩磁化测量作为一种手段来检测德哈斯-范阿尔芬（dHvA）振荡生长的SmB 6晶体铝助熔剂。我们发现，dHvA振荡发生在含有嵌入式铝，起源于用于合成SmB 6的通量的单晶。对具有多个未连接的铝夹杂物的样品的测量表明，铝在SmB 6立方晶格内以优选取向结晶。铝的存在被确认通过散装磁化率测量，但不显示在运输测量的签名。我们讨论我们的结果的后果。
SmB6 is a candidate topological Kondo insulator that displays surface conduction at low temperatures. Here, we perform torque magnetization measurements as a means to detect de Haas-van Alphen (dHvA) oscillations in SmB6 crystals grown by aluminum flux. We find that dHvA oscillations occur in single crystals containing embedded aluminum, originating from the flux used to synthesize SmB6 . Measurements on a sample with multiple, unconnected aluminum inclusions show that aluminum crystallizes in a preferred orientation within the SmB6 cubic lattice. The presence of aluminum is confirmed through bulk susceptibility measurements, but does not show a signature in transport measurements. We discuss the ramifications of our results.